com.hazelcast.org.apache.calcite.tools.RelBuilder Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.org.apache.calcite.tools;
import com.hazelcast.org.apache.calcite.linq4j.Ord;
import com.hazelcast.org.apache.calcite.linq4j.function.Experimental;
import com.hazelcast.org.apache.calcite.plan.Context;
import com.hazelcast.org.apache.calcite.plan.Contexts;
import com.hazelcast.org.apache.calcite.plan.Convention;
import com.hazelcast.org.apache.calcite.plan.RelOptCluster;
import com.hazelcast.org.apache.calcite.plan.RelOptPredicateList;
import com.hazelcast.org.apache.calcite.plan.RelOptSchema;
import com.hazelcast.org.apache.calcite.plan.RelOptTable;
import com.hazelcast.org.apache.calcite.plan.RelOptUtil;
import com.hazelcast.org.apache.calcite.plan.ViewExpanders;
import com.hazelcast.org.apache.calcite.prepare.RelOptTableImpl;
import com.hazelcast.org.apache.calcite.rel.RelCollation;
import com.hazelcast.org.apache.calcite.rel.RelCollations;
import com.hazelcast.org.apache.calcite.rel.RelDistribution;
import com.hazelcast.org.apache.calcite.rel.RelFieldCollation;
import com.hazelcast.org.apache.calcite.rel.RelHomogeneousShuttle;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.Aggregate;
import com.hazelcast.org.apache.calcite.rel.core.AggregateCall;
import com.hazelcast.org.apache.calcite.rel.core.Correlate;
import com.hazelcast.org.apache.calcite.rel.core.CorrelationId;
import com.hazelcast.org.apache.calcite.rel.core.Filter;
import com.hazelcast.org.apache.calcite.rel.core.Intersect;
import com.hazelcast.org.apache.calcite.rel.core.Join;
import com.hazelcast.org.apache.calcite.rel.core.JoinRelType;
import com.hazelcast.org.apache.calcite.rel.core.Match;
import com.hazelcast.org.apache.calcite.rel.core.Minus;
import com.hazelcast.org.apache.calcite.rel.core.Project;
import com.hazelcast.org.apache.calcite.rel.core.RelFactories;
import com.hazelcast.org.apache.calcite.rel.core.RepeatUnion;
import com.hazelcast.org.apache.calcite.rel.core.Snapshot;
import com.hazelcast.org.apache.calcite.rel.core.Sort;
import com.hazelcast.org.apache.calcite.rel.core.Spool;
import com.hazelcast.org.apache.calcite.rel.core.TableFunctionScan;
import com.hazelcast.org.apache.calcite.rel.core.TableScan;
import com.hazelcast.org.apache.calcite.rel.core.TableSpool;
import com.hazelcast.org.apache.calcite.rel.core.Uncollect;
import com.hazelcast.org.apache.calcite.rel.core.Union;
import com.hazelcast.org.apache.calcite.rel.core.Values;
import com.hazelcast.org.apache.calcite.rel.hint.Hintable;
import com.hazelcast.org.apache.calcite.rel.hint.RelHint;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalFilter;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalProject;
import com.hazelcast.org.apache.calcite.rel.metadata.RelColumnMapping;
import com.hazelcast.org.apache.calcite.rel.metadata.RelMetadataQuery;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeField;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFieldImpl;
import com.hazelcast.org.apache.calcite.rex.RexBuilder;
import com.hazelcast.org.apache.calcite.rex.RexCall;
import com.hazelcast.org.apache.calcite.rex.RexCorrelVariable;
import com.hazelcast.org.apache.calcite.rex.RexExecutor;
import com.hazelcast.org.apache.calcite.rex.RexInputRef;
import com.hazelcast.org.apache.calcite.rex.RexLiteral;
import com.hazelcast.org.apache.calcite.rex.RexNode;
import com.hazelcast.org.apache.calcite.rex.RexShuttle;
import com.hazelcast.org.apache.calcite.rex.RexSimplify;
import com.hazelcast.org.apache.calcite.rex.RexUtil;
import com.hazelcast.org.apache.calcite.runtime.Hook;
import com.hazelcast.org.apache.calcite.schema.TransientTable;
import com.hazelcast.org.apache.calcite.schema.impl.ListTransientTable;
import com.hazelcast.org.apache.calcite.sql.SqlAggFunction;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlOperator;
import com.hazelcast.org.apache.calcite.sql.fun.SqlStdOperatorTable;
import com.hazelcast.org.apache.calcite.sql.type.SqlReturnTypeInference;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
import com.hazelcast.org.apache.calcite.sql.type.TableFunctionReturnTypeInference;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidatorUtil;
import com.hazelcast.org.apache.calcite.util.Holder;
import com.hazelcast.org.apache.calcite.util.ImmutableBeans;
import com.hazelcast.org.apache.calcite.util.ImmutableBitSet;
import com.hazelcast.org.apache.calcite.util.ImmutableIntList;
import com.hazelcast.org.apache.calcite.util.ImmutableNullableList;
import com.hazelcast.org.apache.calcite.util.Litmus;
import com.hazelcast.org.apache.calcite.util.NlsString;
import com.hazelcast.org.apache.calcite.util.Optionality;
import com.hazelcast.org.apache.calcite.util.Pair;
import com.hazelcast.org.apache.calcite.util.Util;
import com.hazelcast.org.apache.calcite.util.mapping.Mapping;
import com.hazelcast.org.apache.calcite.util.mapping.Mappings;
import com.hazelcast.com.google.common.base.Preconditions;
import com.hazelcast.com.google.common.collect.ImmutableList;
import com.hazelcast.com.google.common.collect.ImmutableMap;
import com.hazelcast.com.google.common.collect.ImmutableSet;
import com.hazelcast.com.google.common.collect.Iterables;
import com.hazelcast.com.google.common.collect.Lists;
import java.math.BigDecimal;
import java.util.AbstractList;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Deque;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.function.UnaryOperator;
import java.util.stream.Collectors;
import javax.annotation.Nonnull;
import static com.hazelcast.org.apache.calcite.util.Static.RESOURCE;
/**
* Builder for relational expressions.
*
* {@code RelBuilder} does not make possible anything that you could not
* also accomplish by calling the factory methods of the particular relational
* expression. But it makes common tasks more straightforward and concise.
*
*
{@code RelBuilder} uses factories to create relational expressions.
* By default, it uses the default factories, which create logical relational
* expressions ({@link LogicalFilter},
* {@link LogicalProject} and so forth).
* But you could override those factories so that, say, {@code filter} creates
* instead a {@code HiveFilter}.
*
*
It is not thread-safe.
*/
public class RelBuilder {
protected final RelOptCluster cluster;
protected final RelOptSchema relOptSchema;
private final Deque stack = new ArrayDeque<>();
private final RexSimplify simplifier;
private final Config config;
private final RelOptTable.ViewExpander viewExpander;
private final RelFactories.Struct struct;
protected RelBuilder(Context context, RelOptCluster cluster,
RelOptSchema relOptSchema) {
this.cluster = cluster;
this.relOptSchema = relOptSchema;
if (context == null) {
context = Contexts.EMPTY_CONTEXT;
}
this.config = getConfig(context);
this.viewExpander = getViewExpander(cluster, context);
this.struct =
Objects.requireNonNull(RelFactories.Struct.fromContext(context));
final RexExecutor executor =
Util.first(context.unwrap(RexExecutor.class),
Util.first(cluster.getPlanner().getExecutor(), RexUtil.EXECUTOR));
final RelOptPredicateList predicates = RelOptPredicateList.EMPTY;
this.simplifier =
new RexSimplify(cluster.getRexBuilder(), predicates, executor);
}
/**
* Derives the view expander
* {@link com.hazelcast.org.apache.calcite.plan.RelOptTable.ViewExpander}
* to be used for this RelBuilder.
*
*
The ViewExpander instance is used for expanding views in the default
* table scan factory {@code RelFactories.TableScanFactoryImpl}.
* You can also define a new table scan factory in the {@code struct}
* to override the whole table scan creation.
*
*
The default view expander does not support expanding views.
*/
private RelOptTable.ViewExpander getViewExpander(RelOptCluster cluster, Context context) {
return Util.first(context.unwrap(RelOptTable.ViewExpander.class),
ViewExpanders.simpleContext(cluster));
}
/** Derives the Config to be used for this RelBuilder.
*
*
Overrides {@link RelBuilder.Config#simplify} if
* {@link Hook#REL_BUILDER_SIMPLIFY} is set.
*/
private Config getConfig(Context context) {
final Config config =
Util.first(context.unwrap(Config.class), Config.DEFAULT);
boolean simplify = Hook.REL_BUILDER_SIMPLIFY.get(config.simplify());
return config.withSimplify(simplify);
}
/** Creates a RelBuilder. */
public static RelBuilder create(FrameworkConfig config) {
return Frameworks.withPrepare(config,
(cluster, relOptSchema, rootSchema, statement) ->
new RelBuilder(config.getContext(), cluster, relOptSchema));
}
/** Creates a copy of this RelBuilder, with the same state as this, applying
* a transform to the config. */
public RelBuilder transform(UnaryOperator transform) {
final Context context =
Contexts.of(struct, transform.apply(config));
return new RelBuilder(context, cluster, relOptSchema);
}
/** Converts this RelBuilder to a string.
* The string is the string representation of all of the RelNodes on the stack. */
@Override public String toString() {
return stack.stream()
.map(frame -> RelOptUtil.toString(frame.rel))
.collect(Collectors.joining(""));
}
/** Returns the type factory. */
public RelDataTypeFactory getTypeFactory() {
return cluster.getTypeFactory();
}
/** Returns the builder for {@link RexNode} expressions. */
public RexBuilder getRexBuilder() {
return cluster.getRexBuilder();
}
/** Creates a {@link RelBuilderFactory}, a partially-created RelBuilder.
* Just add a {@link RelOptCluster} and a {@link RelOptSchema} */
public static RelBuilderFactory proto(final Context context) {
return (cluster, schema) -> new RelBuilder(context, cluster, schema);
}
/** Creates a {@link RelBuilderFactory} that uses a given set of factories. */
public static RelBuilderFactory proto(Object... factories) {
return proto(Contexts.of(factories));
}
public RelOptCluster getCluster() {
return cluster;
}
public RelOptSchema getRelOptSchema() {
return relOptSchema;
}
public RelFactories.TableScanFactory getScanFactory() {
return struct.scanFactory;
}
// Methods for manipulating the stack
/** Adds a relational expression to be the input to the next relational
* expression constructed.
*
* This method is usual when you want to weave in relational expressions
* that are not supported by the builder. If, while creating such expressions,
* you need to use previously built expressions as inputs, call
* {@link #build()} to pop those inputs. */
public RelBuilder push(RelNode node) {
stack.push(new Frame(node));
return this;
}
/** Adds a rel node to the top of the stack while preserving the field names
* and aliases. */
private void replaceTop(RelNode node) {
final Frame frame = stack.pop();
stack.push(new Frame(node, frame.fields));
}
/** Pushes a collection of relational expressions. */
public RelBuilder pushAll(Iterable nodes) {
for (RelNode node : nodes) {
push(node);
}
return this;
}
/** Returns the final relational expression.
*
*
Throws if the stack is empty.
*/
public RelNode build() {
return stack.pop().rel;
}
/** Returns the relational expression at the top of the stack, but does not
* remove it. */
public RelNode peek() {
return peek_().rel;
}
private Frame peek_() {
return stack.peek();
}
/** Returns the relational expression {@code n} positions from the top of the
* stack, but does not remove it. */
public RelNode peek(int n) {
return peek_(n).rel;
}
private Frame peek_(int n) {
return Iterables.get(stack, n);
}
/** Returns the relational expression {@code n} positions from the top of the
* stack, but does not remove it. */
public RelNode peek(int inputCount, int inputOrdinal) {
return peek_(inputCount, inputOrdinal).rel;
}
private Frame peek_(int inputCount, int inputOrdinal) {
return peek_(inputCount - 1 - inputOrdinal);
}
/** Returns the number of fields in all inputs before (to the left of)
* the given input.
*
* @param inputCount Number of inputs
* @param inputOrdinal Input ordinal
*/
private int inputOffset(int inputCount, int inputOrdinal) {
int offset = 0;
for (int i = 0; i < inputOrdinal; i++) {
offset += peek(inputCount, i).getRowType().getFieldCount();
}
return offset;
}
// Methods that return scalar expressions
/** Creates a literal (constant expression). */
public RexNode literal(Object value) {
final RexBuilder rexBuilder = cluster.getRexBuilder();
if (value == null) {
final RelDataType type = getTypeFactory().createSqlType(SqlTypeName.NULL);
return rexBuilder.makeNullLiteral(type);
} else if (value instanceof Boolean) {
return rexBuilder.makeLiteral((Boolean) value);
} else if (value instanceof BigDecimal) {
return rexBuilder.makeExactLiteral((BigDecimal) value);
} else if (value instanceof Float || value instanceof Double) {
return rexBuilder.makeApproxLiteral(
BigDecimal.valueOf(((Number) value).doubleValue()));
} else if (value instanceof Number) {
return rexBuilder.makeExactLiteral(
BigDecimal.valueOf(((Number) value).longValue()));
} else if (value instanceof String) {
return rexBuilder.makeLiteral((String) value);
} else if (value instanceof Enum) {
return rexBuilder.makeLiteral(value,
getTypeFactory().createSqlType(SqlTypeName.SYMBOL), false);
} else {
throw new IllegalArgumentException("cannot convert " + value
+ " (" + value.getClass() + ") to a constant");
}
}
/** Creates a correlation variable for the current input, and writes it into
* a Holder. */
public RelBuilder variable(Holder v) {
v.set((RexCorrelVariable)
getRexBuilder().makeCorrel(peek().getRowType(),
cluster.createCorrel()));
return this;
}
/** Creates a reference to a field by name.
*
* Equivalent to {@code field(1, 0, fieldName)}.
*
* @param fieldName Field name
*/
public RexInputRef field(String fieldName) {
return field(1, 0, fieldName);
}
/** Creates a reference to a field of given input relational expression
* by name.
*
* @param inputCount Number of inputs
* @param inputOrdinal Input ordinal
* @param fieldName Field name
*/
public RexInputRef field(int inputCount, int inputOrdinal, String fieldName) {
final Frame frame = peek_(inputCount, inputOrdinal);
final List fieldNames = Pair.left(frame.fields());
int i = fieldNames.indexOf(fieldName);
if (i >= 0) {
return field(inputCount, inputOrdinal, i);
} else {
throw new IllegalArgumentException("field [" + fieldName
+ "] not found; input fields are: " + fieldNames);
}
}
/** Creates a reference to an input field by ordinal.
*
* Equivalent to {@code field(1, 0, ordinal)}.
*
* @param fieldOrdinal Field ordinal
*/
public RexInputRef field(int fieldOrdinal) {
return (RexInputRef) field(1, 0, fieldOrdinal, false);
}
/** Creates a reference to a field of a given input relational expression
* by ordinal.
*
* @param inputCount Number of inputs
* @param inputOrdinal Input ordinal
* @param fieldOrdinal Field ordinal within input
*/
public RexInputRef field(int inputCount, int inputOrdinal, int fieldOrdinal) {
return (RexInputRef) field(inputCount, inputOrdinal, fieldOrdinal, false);
}
/** As {@link #field(int, int, int)}, but if {@code alias} is true, the method
* may apply an alias to make sure that the field has the same name as in the
* input frame. If no alias is applied the expression is definitely a
* {@link RexInputRef}. */
private RexNode field(int inputCount, int inputOrdinal, int fieldOrdinal,
boolean alias) {
final Frame frame = peek_(inputCount, inputOrdinal);
final RelNode input = frame.rel;
final RelDataType rowType = input.getRowType();
if (fieldOrdinal < 0 || fieldOrdinal > rowType.getFieldCount()) {
throw new IllegalArgumentException("field ordinal [" + fieldOrdinal
+ "] out of range; input fields are: " + rowType.getFieldNames());
}
final RelDataTypeField field = rowType.getFieldList().get(fieldOrdinal);
final int offset = inputOffset(inputCount, inputOrdinal);
final RexInputRef ref = cluster.getRexBuilder()
.makeInputRef(field.getType(), offset + fieldOrdinal);
final RelDataTypeField aliasField = frame.fields().get(fieldOrdinal);
if (!alias || field.getName().equals(aliasField.getName())) {
return ref;
} else {
return alias(ref, aliasField.getName());
}
}
/** Creates a reference to a field of the current record which originated
* in a relation with a given alias. */
public RexNode field(String alias, String fieldName) {
return field(1, alias, fieldName);
}
/** Creates a reference to a field which originated in a relation with the
* given alias. Searches for the relation starting at the top of the
* stack. */
public RexNode field(int inputCount, String alias, String fieldName) {
Objects.requireNonNull(alias);
Objects.requireNonNull(fieldName);
final List fields = new ArrayList<>();
for (int inputOrdinal = 0; inputOrdinal < inputCount; ++inputOrdinal) {
final Frame frame = peek_(inputOrdinal);
for (Ord p
: Ord.zip(frame.fields)) {
// If alias and field name match, reference that field.
if (p.e.left.contains(alias)
&& p.e.right.getName().equals(fieldName)) {
return field(inputCount, inputCount - 1 - inputOrdinal, p.i);
}
fields.add(
String.format(Locale.ROOT, "{aliases=%s,fieldName=%s}", p.e.left,
p.e.right.getName()));
}
}
throw new IllegalArgumentException("no aliased field found; fields are: "
+ fields);
}
/** Returns a reference to a given field of a record-valued expression. */
public RexNode field(RexNode e, String name) {
return getRexBuilder().makeFieldAccess(e, name, false);
}
/** Returns references to the fields of the top input. */
public ImmutableList fields() {
return fields(1, 0);
}
/** Returns references to the fields of a given input. */
public ImmutableList fields(int inputCount, int inputOrdinal) {
final RelNode input = peek(inputCount, inputOrdinal);
final RelDataType rowType = input.getRowType();
final ImmutableList.Builder nodes = ImmutableList.builder();
for (int fieldOrdinal : Util.range(rowType.getFieldCount())) {
nodes.add(field(inputCount, inputOrdinal, fieldOrdinal));
}
return nodes.build();
}
/** Returns references to fields for a given collation. */
public ImmutableList fields(RelCollation collation) {
final ImmutableList.Builder nodes = ImmutableList.builder();
for (RelFieldCollation fieldCollation : collation.getFieldCollations()) {
RexNode node = field(fieldCollation.getFieldIndex());
switch (fieldCollation.direction) {
case DESCENDING:
node = desc(node);
}
switch (fieldCollation.nullDirection) {
case FIRST:
node = nullsFirst(node);
break;
case LAST:
node = nullsLast(node);
break;
}
nodes.add(node);
}
return nodes.build();
}
/** Returns references to fields for a given list of input ordinals. */
public ImmutableList fields(List ordinals) {
final ImmutableList.Builder nodes = ImmutableList.builder();
for (Number ordinal : ordinals) {
RexNode node = field(1, 0, ordinal.intValue(), false);
nodes.add(node);
}
return nodes.build();
}
/** Returns references to fields for a given bit set of input ordinals. */
public ImmutableList fields(ImmutableBitSet ordinals) {
return fields(ordinals.asList());
}
/** Returns references to fields identified by name. */
public ImmutableList fields(Iterable fieldNames) {
final ImmutableList.Builder builder = ImmutableList.builder();
for (String fieldName : fieldNames) {
builder.add(field(fieldName));
}
return builder.build();
}
/** Returns references to fields identified by a mapping. */
public ImmutableList fields(Mappings.TargetMapping mapping) {
return fields(Mappings.asList(mapping));
}
/** Creates an access to a field by name. */
public RexNode dot(RexNode node, String fieldName) {
final RexBuilder builder = cluster.getRexBuilder();
return builder.makeFieldAccess(node, fieldName, true);
}
/** Creates an access to a field by ordinal. */
public RexNode dot(RexNode node, int fieldOrdinal) {
final RexBuilder builder = cluster.getRexBuilder();
return builder.makeFieldAccess(node, fieldOrdinal);
}
/** Creates a call to a scalar operator. */
public @Nonnull RexNode call(SqlOperator operator, RexNode... operands) {
return call(operator, ImmutableList.copyOf(operands));
}
/** Creates a call to a scalar operator. */
private @Nonnull RexNode call(SqlOperator operator, List operandList) {
final RexBuilder builder = cluster.getRexBuilder();
final RelDataType type = builder.deriveReturnType(operator, operandList);
return builder.makeCall(type, operator, operandList);
}
/** Creates a call to a scalar operator. */
public @Nonnull RexNode call(SqlOperator operator,
Iterable operands) {
return call(operator, ImmutableList.copyOf(operands));
}
/** Creates an AND. */
public RexNode and(RexNode... operands) {
return and(ImmutableList.copyOf(operands));
}
/** Creates an AND.
*
* Simplifies the expression a little:
* {@code e AND TRUE} becomes {@code e};
* {@code e AND e2 AND NOT e} becomes {@code e2}. */
public RexNode and(Iterable operands) {
return RexUtil.composeConjunction(getRexBuilder(), operands);
}
/** Creates an OR. */
public RexNode or(RexNode... operands) {
return or(ImmutableList.copyOf(operands));
}
/** Creates an OR. */
public RexNode or(Iterable operands) {
return RexUtil.composeDisjunction(cluster.getRexBuilder(), operands);
}
/** Creates a NOT. */
public RexNode not(RexNode operand) {
return call(SqlStdOperatorTable.NOT, operand);
}
/** Creates an {@code =}. */
public RexNode equals(RexNode operand0, RexNode operand1) {
return call(SqlStdOperatorTable.EQUALS, operand0, operand1);
}
/** Creates a {@code <>}. */
public RexNode notEquals(RexNode operand0, RexNode operand1) {
return call(SqlStdOperatorTable.NOT_EQUALS, operand0, operand1);
}
/** Creates a IS NULL. */
public RexNode isNull(RexNode operand) {
return call(SqlStdOperatorTable.IS_NULL, operand);
}
/** Creates a IS NOT NULL. */
public RexNode isNotNull(RexNode operand) {
return call(SqlStdOperatorTable.IS_NOT_NULL, operand);
}
/** Creates an expression that casts an expression to a given type. */
public RexNode cast(RexNode expr, SqlTypeName typeName) {
final RelDataType type = cluster.getTypeFactory().createSqlType(typeName);
return cluster.getRexBuilder().makeCast(type, expr);
}
/** Creates an expression that casts an expression to a type with a given name
* and precision or length. */
public RexNode cast(RexNode expr, SqlTypeName typeName, int precision) {
final RelDataType type =
cluster.getTypeFactory().createSqlType(typeName, precision);
return cluster.getRexBuilder().makeCast(type, expr);
}
/** Creates an expression that casts an expression to a type with a given
* name, precision and scale. */
public RexNode cast(RexNode expr, SqlTypeName typeName, int precision,
int scale) {
final RelDataType type =
cluster.getTypeFactory().createSqlType(typeName, precision, scale);
return cluster.getRexBuilder().makeCast(type, expr);
}
/**
* Returns an expression wrapped in an alias.
*
*
This method is idempotent: If the expression is already wrapped in the
* correct alias, does nothing; if wrapped in an incorrect alias, removes
* the incorrect alias and applies the correct alias.
*
* @see #project
*/
public RexNode alias(RexNode expr, String alias) {
final RexNode aliasLiteral = literal(alias);
switch (expr.getKind()) {
case AS:
final RexCall call = (RexCall) expr;
if (call.operands.get(1).equals(aliasLiteral)) {
// current alias is correct
return expr;
}
expr = call.operands.get(0);
// strip current (incorrect) alias, and fall through
default:
return call(SqlStdOperatorTable.AS, expr, aliasLiteral);
}
}
/** Converts a sort expression to descending. */
public RexNode desc(RexNode node) {
return call(SqlStdOperatorTable.DESC, node);
}
/** Converts a sort expression to nulls last. */
public RexNode nullsLast(RexNode node) {
return call(SqlStdOperatorTable.NULLS_LAST, node);
}
/** Converts a sort expression to nulls first. */
public RexNode nullsFirst(RexNode node) {
return call(SqlStdOperatorTable.NULLS_FIRST, node);
}
// Methods that create group keys and aggregate calls
/** Creates an empty group key. */
public GroupKey groupKey() {
return groupKey(ImmutableList.of());
}
/** Creates a group key. */
public GroupKey groupKey(RexNode... nodes) {
return groupKey(ImmutableList.copyOf(nodes));
}
/** Creates a group key. */
public GroupKey groupKey(Iterable nodes) {
return new GroupKeyImpl(ImmutableList.copyOf(nodes), null, null);
}
/** Creates a group key with grouping sets. */
public GroupKey groupKey(Iterable nodes,
Iterable> nodeLists) {
return groupKey_(nodes, nodeLists);
}
/** @deprecated Now that indicator is deprecated, use
* {@link #groupKey(Iterable, Iterable)}, which has the same behavior as
* calling this method with {@code indicator = false}. */
@Deprecated // to be removed before 2.0
public GroupKey groupKey(Iterable nodes, boolean indicator,
Iterable> nodeLists) {
Aggregate.checkIndicator(indicator);
return groupKey_(nodes, nodeLists);
}
private GroupKey groupKey_(Iterable nodes,
Iterable> nodeLists) {
final ImmutableList.Builder> builder =
ImmutableList.builder();
for (Iterable nodeList : nodeLists) {
builder.add(ImmutableList.copyOf(nodeList));
}
return new GroupKeyImpl(ImmutableList.copyOf(nodes), builder.build(), null);
}
/** Creates a group key of fields identified by ordinal. */
public GroupKey groupKey(int... fieldOrdinals) {
return groupKey(fields(ImmutableIntList.of(fieldOrdinals)));
}
/** Creates a group key of fields identified by name. */
public GroupKey groupKey(String... fieldNames) {
return groupKey(fields(ImmutableList.copyOf(fieldNames)));
}
/** Creates a group key, identified by field positions
* in the underlying relational expression.
*
* This method of creating a group key does not allow you to group on new
* expressions, only column projections, but is efficient, especially when you
* are coming from an existing {@link Aggregate}. */
public GroupKey groupKey(@Nonnull ImmutableBitSet groupSet) {
return groupKey_(groupSet, ImmutableList.of(groupSet));
}
/** Creates a group key with grouping sets, both identified by field positions
* in the underlying relational expression.
*
*
This method of creating a group key does not allow you to group on new
* expressions, only column projections, but is efficient, especially when you
* are coming from an existing {@link Aggregate}. */
public GroupKey groupKey(ImmutableBitSet groupSet,
@Nonnull Iterable groupSets) {
return groupKey_(groupSet, ImmutableList.copyOf(groupSets));
}
/** @deprecated Use {@link #groupKey(ImmutableBitSet)}
* or {@link #groupKey(ImmutableBitSet, Iterable)}. */
@Deprecated // to be removed before 2.0
public GroupKey groupKey(ImmutableBitSet groupSet,
ImmutableList groupSets) {
return groupKey_(groupSet, groupSets == null
? ImmutableList.of(groupSet) : ImmutableList.copyOf(groupSets));
}
/** @deprecated Use {@link #groupKey(ImmutableBitSet, Iterable)}. */
@Deprecated // to be removed before 2.0
public GroupKey groupKey(ImmutableBitSet groupSet, boolean indicator,
ImmutableList groupSets) {
Aggregate.checkIndicator(indicator);
return groupKey_(groupSet, groupSets == null
? ImmutableList.of(groupSet) : ImmutableList.copyOf(groupSets));
}
private GroupKey groupKey_(ImmutableBitSet groupSet,
@Nonnull ImmutableList groupSets) {
if (groupSet.length() > peek().getRowType().getFieldCount()) {
throw new IllegalArgumentException("out of bounds: " + groupSet);
}
Objects.requireNonNull(groupSets);
final ImmutableList nodes = fields(groupSet);
return groupKey_(nodes, Util.transform(groupSets, bitSet -> fields(bitSet)));
}
@Deprecated // to be removed before 2.0
public AggCall aggregateCall(SqlAggFunction aggFunction, boolean distinct,
RexNode filter, String alias, RexNode... operands) {
return aggregateCall(aggFunction, distinct, false, false, filter,
ImmutableList.of(), alias, ImmutableList.copyOf(operands));
}
@Deprecated // to be removed before 2.0
public AggCall aggregateCall(SqlAggFunction aggFunction, boolean distinct,
boolean approximate, RexNode filter, String alias, RexNode... operands) {
return aggregateCall(aggFunction, distinct, approximate, false, filter,
ImmutableList.of(), alias, ImmutableList.copyOf(operands));
}
@Deprecated // to be removed before 2.0
public AggCall aggregateCall(SqlAggFunction aggFunction, boolean distinct,
RexNode filter, String alias, Iterable operands) {
return aggregateCall(aggFunction, distinct, false, false, filter,
ImmutableList.of(), alias, ImmutableList.copyOf(operands));
}
@Deprecated // to be removed before 2.0
public AggCall aggregateCall(SqlAggFunction aggFunction, boolean distinct,
boolean approximate, RexNode filter, String alias,
Iterable operands) {
return aggregateCall(aggFunction, distinct, approximate, false, filter,
ImmutableList.of(), alias, ImmutableList.copyOf(operands));
}
/** Creates a call to an aggregate function.
*
* To add other operands, apply
* {@link AggCall#distinct()},
* {@link AggCall#approximate(boolean)},
* {@link AggCall#filter(RexNode...)},
* {@link AggCall#sort},
* {@link AggCall#as} to the result. */
public AggCall aggregateCall(SqlAggFunction aggFunction,
Iterable operands) {
return aggregateCall(aggFunction, false, false, false, null, ImmutableList.of(),
null, ImmutableList.copyOf(operands));
}
/** Creates a call to an aggregate function.
*
*
To add other operands, apply
* {@link AggCall#distinct()},
* {@link AggCall#approximate(boolean)},
* {@link AggCall#filter(RexNode...)},
* {@link AggCall#sort},
* {@link AggCall#as} to the result. */
public AggCall aggregateCall(SqlAggFunction aggFunction,
RexNode... operands) {
return aggregateCall(aggFunction, false, false, false, null, ImmutableList.of(),
null, ImmutableList.copyOf(operands));
}
/** Creates a call to an aggregate function with all applicable operands. */
protected AggCall aggregateCall(SqlAggFunction aggFunction, boolean distinct,
boolean approximate, boolean ignoreNulls, RexNode filter, ImmutableList orderKeys,
String alias, ImmutableList operands) {
return new AggCallImpl(aggFunction, distinct, approximate, ignoreNulls,
filter, alias, operands, orderKeys);
}
/** Creates a call to the {@code COUNT} aggregate function. */
public AggCall count(RexNode... operands) {
return count(false, null, operands);
}
/** Creates a call to the {@code COUNT} aggregate function. */
public AggCall count(Iterable operands) {
return count(false, null, operands);
}
/** Creates a call to the {@code COUNT} aggregate function,
* optionally distinct and with an alias. */
public AggCall count(boolean distinct, String alias, RexNode... operands) {
return aggregateCall(SqlStdOperatorTable.COUNT, distinct, false, false, null,
ImmutableList.of(), alias, ImmutableList.copyOf(operands));
}
/** Creates a call to the {@code COUNT} aggregate function,
* optionally distinct and with an alias. */
public AggCall count(boolean distinct, String alias,
Iterable operands) {
return aggregateCall(SqlStdOperatorTable.COUNT, distinct, false, false, null,
ImmutableList.of(), alias, ImmutableList.copyOf(operands));
}
/** Creates a call to the {@code COUNT(*)} aggregate function. */
public AggCall countStar(String alias) {
return count(false, alias);
}
/** Creates a call to the {@code SUM} aggregate function. */
public AggCall sum(RexNode operand) {
return sum(false, null, operand);
}
/** Creates a call to the {@code SUM} aggregate function,
* optionally distinct and with an alias. */
public AggCall sum(boolean distinct, String alias, RexNode operand) {
return aggregateCall(SqlStdOperatorTable.SUM, distinct, false, false, null,
ImmutableList.of(), alias, ImmutableList.of(operand));
}
/** Creates a call to the {@code AVG} aggregate function. */
public AggCall avg(RexNode operand) {
return avg(false, null, operand);
}
/** Creates a call to the {@code AVG} aggregate function,
* optionally distinct and with an alias. */
public AggCall avg(boolean distinct, String alias, RexNode operand) {
return aggregateCall(SqlStdOperatorTable.AVG, distinct, false, false, null,
ImmutableList.of(), alias, ImmutableList.of(operand));
}
/** Creates a call to the {@code MIN} aggregate function. */
public AggCall min(RexNode operand) {
return min(null, operand);
}
/** Creates a call to the {@code MIN} aggregate function,
* optionally with an alias. */
public AggCall min(String alias, RexNode operand) {
return aggregateCall(SqlStdOperatorTable.MIN, false, false, false, null,
ImmutableList.of(), alias, ImmutableList.of(operand));
}
/** Creates a call to the {@code MAX} aggregate function,
* optionally with an alias. */
public AggCall max(RexNode operand) {
return max(null, operand);
}
/** Creates a call to the {@code MAX} aggregate function. */
public AggCall max(String alias, RexNode operand) {
return aggregateCall(SqlStdOperatorTable.MAX, false, false, false, null,
ImmutableList.of(), alias, ImmutableList.of(operand));
}
// Methods for patterns
/**
* Creates a reference to a given field of the pattern.
*
* @param alpha the pattern name
* @param type Type of field
* @param i Ordinal of field
* @return Reference to field of pattern
*/
public RexNode patternField(String alpha, RelDataType type, int i) {
return getRexBuilder().makePatternFieldRef(alpha, type, i);
}
/** Creates a call that concatenates patterns;
* for use in {@link #match}. */
public RexNode patternConcat(Iterable nodes) {
final ImmutableList list = ImmutableList.copyOf(nodes);
if (list.size() > 2) {
// Convert into binary calls
return patternConcat(patternConcat(Util.skipLast(list)), Util.last(list));
}
final RelDataType t = getTypeFactory().createSqlType(SqlTypeName.NULL);
return getRexBuilder().makeCall(t, SqlStdOperatorTable.PATTERN_CONCAT,
list);
}
/** Creates a call that concatenates patterns;
* for use in {@link #match}. */
public RexNode patternConcat(RexNode... nodes) {
return patternConcat(ImmutableList.copyOf(nodes));
}
/** Creates a call that creates alternate patterns;
* for use in {@link #match}. */
public RexNode patternAlter(Iterable nodes) {
final RelDataType t = getTypeFactory().createSqlType(SqlTypeName.NULL);
return getRexBuilder().makeCall(t, SqlStdOperatorTable.PATTERN_ALTER,
ImmutableList.copyOf(nodes));
}
/** Creates a call that creates alternate patterns;
* for use in {@link #match}. */
public RexNode patternAlter(RexNode... nodes) {
return patternAlter(ImmutableList.copyOf(nodes));
}
/** Creates a call that creates quantify patterns;
* for use in {@link #match}. */
public RexNode patternQuantify(Iterable nodes) {
final RelDataType t = getTypeFactory().createSqlType(SqlTypeName.NULL);
return getRexBuilder().makeCall(t, SqlStdOperatorTable.PATTERN_QUANTIFIER,
ImmutableList.copyOf(nodes));
}
/** Creates a call that creates quantify patterns;
* for use in {@link #match}. */
public RexNode patternQuantify(RexNode... nodes) {
return patternQuantify(ImmutableList.copyOf(nodes));
}
/** Creates a call that creates permute patterns;
* for use in {@link #match}. */
public RexNode patternPermute(Iterable nodes) {
final RelDataType t = getTypeFactory().createSqlType(SqlTypeName.NULL);
return getRexBuilder().makeCall(t, SqlStdOperatorTable.PATTERN_PERMUTE,
ImmutableList.copyOf(nodes));
}
/** Creates a call that creates permute patterns;
* for use in {@link #match}. */
public RexNode patternPermute(RexNode... nodes) {
return patternPermute(ImmutableList.copyOf(nodes));
}
/** Creates a call that creates an exclude pattern;
* for use in {@link #match}. */
public RexNode patternExclude(RexNode node) {
final RelDataType t = getTypeFactory().createSqlType(SqlTypeName.NULL);
return getRexBuilder().makeCall(t, SqlStdOperatorTable.PATTERN_EXCLUDE,
ImmutableList.of(node));
}
// Methods that create relational expressions
/** Creates a {@link TableScan} of the table
* with a given name.
*
* Throws if the table does not exist.
*
*
Returns this builder.
*
* @param tableNames Name of table (can optionally be qualified)
*/
public RelBuilder scan(Iterable tableNames) {
final List names = ImmutableList.copyOf(tableNames);
final RelOptTable relOptTable = relOptSchema.getTableForMember(names);
if (relOptTable == null) {
throw RESOURCE.tableNotFound(String.join(".", names)).ex();
}
final RelNode scan =
struct.scanFactory.createScan(
ViewExpanders.toRelContext(viewExpander, cluster),
relOptTable);
push(scan);
rename(relOptTable.getRowType().getFieldNames());
// When the node is not a TableScan but from expansion,
// we need to explicitly add the alias.
if (!(scan instanceof TableScan)) {
as(Util.last(ImmutableList.copyOf(tableNames)));
}
return this;
}
/** Creates a {@link TableScan} of the table
* with a given name.
*
* Throws if the table does not exist.
*
*
Returns this builder.
*
* @param tableNames Name of table (can optionally be qualified)
*/
public RelBuilder scan(String... tableNames) {
return scan(ImmutableList.copyOf(tableNames));
}
/** Creates a {@link Snapshot} of a given snapshot period.
*
*
Returns this builder.
*
* @param period Name of table (can optionally be qualified)
*/
public RelBuilder snapshot(RexNode period) {
final Frame frame = stack.pop();
final RelNode snapshot =
struct.snapshotFactory.createSnapshot(frame.rel, period);
stack.push(new Frame(snapshot, frame.fields));
return this;
}
/**
* Gets column mappings of the operator.
*
* @param op operator instance
* @return column mappings associated with this function
*/
private Set getColumnMappings(SqlOperator op) {
SqlReturnTypeInference inference = op.getReturnTypeInference();
if (inference instanceof TableFunctionReturnTypeInference) {
return ((TableFunctionReturnTypeInference) inference).getColumnMappings();
} else {
return null;
}
}
/**
* Creates a RexCall to the {@code CURSOR} function by ordinal.
*
* @param inputCount Number of inputs
* @param ordinal The reference to the relational input
* @return RexCall to CURSOR function
*/
public RexNode cursor(int inputCount, int ordinal) {
if (inputCount <= ordinal || ordinal < 0) {
throw new IllegalArgumentException("bad input count or ordinal");
}
// Refer to the "ordinal"th input as if it were a field
// (because that's how things are laid out inside a TableFunctionScan)
final RelNode input = peek(inputCount, ordinal);
return call(SqlStdOperatorTable.CURSOR,
getRexBuilder().makeInputRef(input.getRowType(), ordinal));
}
/** Creates a {@link TableFunctionScan}. */
public RelBuilder functionScan(SqlOperator operator,
int inputCount, RexNode... operands) {
return functionScan(operator, inputCount, ImmutableList.copyOf(operands));
}
/** Creates a {@link TableFunctionScan}. */
public RelBuilder functionScan(SqlOperator operator,
int inputCount, Iterable operands) {
if (inputCount < 0 || inputCount > stack.size()) {
throw new IllegalArgumentException("bad input count");
}
// Gets inputs.
final List inputs = new LinkedList<>();
for (int i = 0; i < inputCount; i++) {
inputs.add(0, build());
}
final RexNode call = call(operator, ImmutableList.copyOf(operands));
final RelNode functionScan =
struct.tableFunctionScanFactory.createTableFunctionScan(cluster,
inputs, call, null, getColumnMappings(operator));
push(functionScan);
return this;
}
/** Creates a {@link Filter} of an array of
* predicates.
*
* The predicates are combined using AND,
* and optimized in a similar way to the {@link #and} method.
* If the result is TRUE no filter is created. */
public RelBuilder filter(RexNode... predicates) {
return filter(ImmutableSet.of(), ImmutableList.copyOf(predicates));
}
/** Creates a {@link Filter} of a list of
* predicates.
*
*
The predicates are combined using AND,
* and optimized in a similar way to the {@link #and} method.
* If the result is TRUE no filter is created. */
public RelBuilder filter(Iterable predicates) {
return filter(ImmutableSet.of(), predicates);
}
/** Creates a {@link Filter} of a list of correlation variables
* and an array of predicates.
*
*
The predicates are combined using AND,
* and optimized in a similar way to the {@link #and} method.
* If the result is TRUE no filter is created. */
public RelBuilder filter(Iterable variablesSet,
RexNode... predicates) {
return filter(variablesSet, ImmutableList.copyOf(predicates));
}
/**
* Creates a {@link Filter} of a list of correlation variables
* and a list of predicates.
*
* The predicates are combined using AND,
* and optimized in a similar way to the {@link #and} method.
* If the result is TRUE no filter is created. */
public RelBuilder filter(Iterable variablesSet,
Iterable predicates) {
final RexNode simplifiedPredicates =
simplifier.simplifyFilterPredicates(predicates);
if (simplifiedPredicates == null) {
return empty();
}
if (!simplifiedPredicates.isAlwaysTrue()) {
final Frame frame = stack.pop();
final RelNode filter =
struct.filterFactory.createFilter(frame.rel,
simplifiedPredicates, ImmutableSet.copyOf(variablesSet));
stack.push(new Frame(filter, frame.fields));
}
return this;
}
/** Creates a {@link Project} of the given
* expressions. */
public RelBuilder project(RexNode... nodes) {
return project(ImmutableList.copyOf(nodes));
}
/** Creates a {@link Project} of the given list
* of expressions.
*
* Infers names as would {@link #project(Iterable, Iterable)} if all
* suggested names were null.
*
* @param nodes Expressions
*/
public RelBuilder project(Iterable nodes) {
return project(nodes, ImmutableList.of());
}
/** Creates a {@link Project} of the given list
* of expressions and field names.
*
* @param nodes Expressions
* @param fieldNames field names for expressions
*/
public RelBuilder project(Iterable nodes,
Iterable fieldNames) {
return project(nodes, fieldNames, false);
}
/** Creates a {@link Project} of the given list
* of expressions, using the given names.
*
* Names are deduced as follows:
*
* - If the length of {@code fieldNames} is greater than the index of
* the current entry in {@code nodes}, and the entry in
* {@code fieldNames} is not null, uses it; otherwise
*
- If an expression projects an input field,
* or is a cast an input field,
* uses the input field name; otherwise
*
- If an expression is a call to
* {@link SqlStdOperatorTable#AS}
* (see {@link #alias}), removes the call but uses the intended alias.
*
*
* After the field names have been inferred, makes the
* field names unique by appending numeric suffixes.
*
* @param nodes Expressions
* @param fieldNames Suggested field names
* @param force create project even if it is identity
*/
public RelBuilder project(Iterable nodes,
Iterable fieldNames, boolean force) {
return project_(nodes, fieldNames, ImmutableList.of(), force);
}
/** Creates a {@link Project} of all original fields, plus the given
* expressions. */
public RelBuilder projectPlus(RexNode... nodes) {
return projectPlus(ImmutableList.copyOf(nodes));
}
/** Creates a {@link Project} of all original fields, plus the given list of
* expressions. */
public RelBuilder projectPlus(Iterable nodes) {
final ImmutableList.Builder builder = ImmutableList.builder();
return project(builder.addAll(fields()).addAll(nodes).build());
}
/** Creates a {@link Project} of all original fields, except the given
* expressions.
*
* @throws IllegalArgumentException if the given expressions contain duplicates
* or there is an expression that does not match an existing field
*/
public RelBuilder projectExcept(RexNode... expressions) {
return projectExcept(ImmutableList.copyOf(expressions));
}
/** Creates a {@link Project} of all original fields, except the given list of
* expressions.
*
* @throws IllegalArgumentException if the given expressions contain duplicates
* or there is an expression that does not match an existing field
*/
public RelBuilder projectExcept(Iterable expressions) {
List allExpressions = new ArrayList<>(fields());
Set excludeExpressions = new HashSet<>();
for (RexNode excludeExp : expressions) {
if (!excludeExpressions.add(excludeExp)) {
throw new IllegalArgumentException(
"Input list contains duplicates. Expression " + excludeExp + " exists multiple times.");
}
if (!allExpressions.remove(excludeExp)) {
throw new IllegalArgumentException("Expression " + excludeExp.toString() + " not found.");
}
}
return this.project(allExpressions);
}
/** Creates a {@link Project} of the given list
* of expressions, using the given names.
*
* Names are deduced as follows:
*
* - If the length of {@code fieldNames} is greater than the index of
* the current entry in {@code nodes}, and the entry in
* {@code fieldNames} is not null, uses it; otherwise
*
- If an expression projects an input field,
* or is a cast an input field,
* uses the input field name; otherwise
*
- If an expression is a call to
* {@link SqlStdOperatorTable#AS}
* (see {@link #alias}), removes the call but uses the intended alias.
*
*
* After the field names have been inferred, makes the
* field names unique by appending numeric suffixes.
*
* @param nodes Expressions
* @param fieldNames Suggested field names
* @param hints Hints
* @param force create project even if it is identity
*/
private RelBuilder project_(
Iterable nodes,
Iterable fieldNames,
Iterable hints,
boolean force) {
final Frame frame = stack.peek();
final RelDataType inputRowType = frame.rel.getRowType();
final List nodeList = Lists.newArrayList(nodes);
// Perform a quick check for identity. We'll do a deeper check
// later when we've derived column names.
if (!force && Iterables.isEmpty(fieldNames)
&& RexUtil.isIdentity(nodeList, inputRowType)) {
return this;
}
final List fieldNameList = Lists.newArrayList(fieldNames);
while (fieldNameList.size() < nodeList.size()) {
fieldNameList.add(null);
}
bloat:
if (frame.rel instanceof Project
&& config.bloat() >= 0) {
final Project project = (Project) frame.rel;
// Populate field names. If the upper expression is an input ref and does
// not have a recommended name, use the name of the underlying field.
for (int i = 0; i < fieldNameList.size(); i++) {
if (fieldNameList.get(i) == null) {
final RexNode node = nodeList.get(i);
if (node instanceof RexInputRef) {
final RexInputRef ref = (RexInputRef) node;
fieldNameList.set(i,
project.getRowType().getFieldNames().get(ref.getIndex()));
}
}
}
final List newNodes =
RelOptUtil.pushPastProjectUnlessBloat(nodeList, project,
config.bloat());
if (newNodes == null) {
// The merged expression is more complex than the input expressions.
// Do not merge.
break bloat;
}
// Carefully build a list of fields, so that table aliases from the input
// can be seen for fields that are based on a RexInputRef.
final Frame frame1 = stack.pop();
final List fields = new ArrayList<>();
for (RelDataTypeField f
: project.getInput().getRowType().getFieldList()) {
fields.add(new Field(ImmutableSet.of(), f));
}
for (Pair pair
: Pair.zip(project.getProjects(), frame1.fields)) {
switch (pair.left.getKind()) {
case INPUT_REF:
final int i = ((RexInputRef) pair.left).getIndex();
final Field field = fields.get(i);
final ImmutableSet aliases = pair.right.left;
fields.set(i, new Field(aliases, field.right));
break;
}
}
stack.push(new Frame(project.getInput(), ImmutableList.copyOf(fields)));
final ImmutableSet.Builder mergedHints = ImmutableSet.builder();
mergedHints.addAll(project.getHints());
mergedHints.addAll(hints);
return project_(newNodes, fieldNameList, mergedHints.build(), force);
}
// Simplify expressions.
if (config.simplify()) {
for (int i = 0; i < nodeList.size(); i++) {
nodeList.set(i, simplifier.simplifyPreservingType(nodeList.get(i)));
}
}
// Replace null names with generated aliases.
for (int i = 0; i < fieldNameList.size(); i++) {
if (fieldNameList.get(i) == null) {
fieldNameList.set(i, inferAlias(nodeList, nodeList.get(i), i));
}
}
final ImmutableList.Builder fields = ImmutableList.builder();
final Set uniqueNameList =
getTypeFactory().getTypeSystem().isSchemaCaseSensitive()
? new HashSet<>()
: new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
// calculate final names and build field list
for (int i = 0; i < fieldNameList.size(); ++i) {
final RexNode node = nodeList.get(i);
String name = fieldNameList.get(i);
String originalName = name;
Field field;
if (name == null || uniqueNameList.contains(name)) {
int j = 0;
if (name == null) {
j = i;
}
do {
name = SqlValidatorUtil.F_SUGGESTER.apply(originalName, j, j++);
} while (uniqueNameList.contains(name));
fieldNameList.set(i, name);
}
RelDataTypeField fieldType =
new RelDataTypeFieldImpl(name, i, node.getType());
switch (node.getKind()) {
case INPUT_REF:
// preserve rel aliases for INPUT_REF fields
final int index = ((RexInputRef) node).getIndex();
field = new Field(frame.fields.get(index).left, fieldType);
break;
default:
field = new Field(ImmutableSet.of(), fieldType);
break;
}
uniqueNameList.add(name);
fields.add(field);
}
if (!force && RexUtil.isIdentity(nodeList, inputRowType)) {
if (fieldNameList.equals(inputRowType.getFieldNames())) {
// Do not create an identity project if it does not rename any fields
return this;
} else {
// create "virtual" row type for project only rename fields
stack.pop();
// Ignore the hints.
stack.push(new Frame(frame.rel, fields.build()));
}
return this;
}
final RelNode project =
struct.projectFactory.createProject(frame.rel,
ImmutableList.copyOf(hints),
ImmutableList.copyOf(nodeList),
fieldNameList);
stack.pop();
stack.push(new Frame(project, fields.build()));
return this;
}
/** Whether to attempt to merge consecutive {@link Project} operators.
*
* The default implementation returns {@code true};
* sub-classes may disable merge by overriding to return {@code false}. */
@Experimental
@Deprecated
protected boolean shouldMergeProject() {
return true;
}
/** Creates a {@link Project} of the given
* expressions and field names, and optionally optimizing.
*
*
If {@code fieldNames} is null, or if a particular entry in
* {@code fieldNames} is null, derives field names from the input
* expressions.
*
*
If {@code force} is false,
* and the input is a {@code Project},
* and the expressions make the trivial projection ($0, $1, ...),
* modifies the input.
*
* @param nodes Expressions
* @param fieldNames Suggested field names, or null to generate
* @param force Whether to create a renaming Project if the
* projections are trivial
*/
public RelBuilder projectNamed(Iterable nodes,
Iterable fieldNames, boolean force) {
@SuppressWarnings("unchecked") final List nodeList =
nodes instanceof List ? (List) nodes : ImmutableList.copyOf(nodes);
final List fieldNameList =
fieldNames == null ? null
: fieldNames instanceof List ? (List) fieldNames
: ImmutableNullableList.copyOf(fieldNames);
final RelNode input = peek();
final RelDataType rowType =
RexUtil.createStructType(cluster.getTypeFactory(), nodeList,
fieldNameList, SqlValidatorUtil.F_SUGGESTER);
if (!force
&& RexUtil.isIdentity(nodeList, input.getRowType())) {
if (input instanceof Project && fieldNames != null) {
// Rename columns of child projection if desired field names are given.
final Frame frame = stack.pop();
final Project childProject = (Project) frame.rel;
final Project newInput = childProject.copy(childProject.getTraitSet(),
childProject.getInput(), childProject.getProjects(), rowType);
stack.push(new Frame(newInput.attachHints(childProject.getHints()), frame.fields));
}
} else {
project(nodeList, rowType.getFieldNames(), force);
}
return this;
}
/**
* Creates an {@link Uncollect} with given item aliases.
*
* @param itemAliases Operand item aliases, never null
* @param withOrdinality If {@code withOrdinality}, the output contains an extra
* {@code ORDINALITY} column
*/
public RelBuilder uncollect(List itemAliases, boolean withOrdinality) {
Frame frame = stack.pop();
stack.push(
new Frame(
new Uncollect(
cluster,
cluster.traitSetOf(Convention.NONE),
frame.rel,
withOrdinality,
Objects.requireNonNull(itemAliases))));
return this;
}
/** Ensures that the field names match those given.
*
* If all fields have the same name, adds nothing;
* if any fields do not have the same name, adds a {@link Project}.
*
*
Note that the names can be short-lived. Other {@code RelBuilder}
* operations make no guarantees about the field names of the rows they
* produce.
*
* @param fieldNames List of desired field names; may contain null values or
* have fewer fields than the current row type
*/
public RelBuilder rename(List fieldNames) {
final List oldFieldNames = peek().getRowType().getFieldNames();
Preconditions.checkArgument(fieldNames.size() <= oldFieldNames.size(),
"More names than fields");
final List newFieldNames = new ArrayList<>(oldFieldNames);
for (int i = 0; i < fieldNames.size(); i++) {
final String s = fieldNames.get(i);
if (s != null) {
newFieldNames.set(i, s);
}
}
if (oldFieldNames.equals(newFieldNames)) {
return this;
}
if (peek() instanceof Values) {
// Special treatment for VALUES. Re-build it rather than add a project.
final Values v = (Values) build();
final RelDataTypeFactory.Builder b = getTypeFactory().builder();
for (Pair p
: Pair.zip(newFieldNames, v.getRowType().getFieldList())) {
b.add(p.left, p.right.getType());
}
return values(v.tuples, b.build());
}
return project(fields(), newFieldNames, true);
}
/** Infers the alias of an expression.
*
* If the expression was created by {@link #alias}, replaces the expression
* in the project list.
*/
private String inferAlias(List exprList, RexNode expr, int i) {
switch (expr.getKind()) {
case INPUT_REF:
final RexInputRef ref = (RexInputRef) expr;
return stack.peek().fields.get(ref.getIndex()).getValue().getName();
case CAST:
return inferAlias(exprList, ((RexCall) expr).getOperands().get(0), -1);
case AS:
final RexCall call = (RexCall) expr;
if (i >= 0) {
exprList.set(i, call.getOperands().get(0));
}
return ((NlsString) ((RexLiteral) call.getOperands().get(1)).getValue())
.getValue();
default:
return null;
}
}
/** Creates an {@link Aggregate} that makes the
* relational expression distinct on all fields. */
public RelBuilder distinct() {
return aggregate(groupKey(fields()));
}
/** Creates an {@link Aggregate} with an array of
* calls. */
public RelBuilder aggregate(GroupKey groupKey, AggCall... aggCalls) {
return aggregate(groupKey, ImmutableList.copyOf(aggCalls));
}
/** Creates an {@link Aggregate} with an array of
* {@link AggregateCall}s. */
public RelBuilder aggregate(GroupKey groupKey, List aggregateCalls) {
return aggregate(groupKey,
aggregateCalls.stream()
.map(AggCallImpl2::new)
.collect(Collectors.toList()));
}
/** Creates an {@link Aggregate} with multiple
* calls. */
public RelBuilder aggregate(GroupKey groupKey, Iterable aggCalls) {
final Registrar registrar =
new Registrar(fields(), peek().getRowType().getFieldNames());
final GroupKeyImpl groupKey_ = (GroupKeyImpl) groupKey;
ImmutableBitSet groupSet =
ImmutableBitSet.of(registrar.registerExpressions(groupKey_.nodes));
label:
if (Iterables.isEmpty(aggCalls)) {
final RelMetadataQuery mq = peek().getCluster().getMetadataQuery();
if (groupSet.isEmpty()) {
final Double minRowCount = mq.getMinRowCount(peek());
if (minRowCount == null || minRowCount < 1D) {
// We can't remove "GROUP BY ()" if there's a chance the rel could be
// empty.
break label;
}
}
if (registrar.extraNodes.size() == fields().size()) {
final Boolean unique = mq.areColumnsUnique(peek(), groupSet);
if (unique != null && unique) {
// Rel is already unique.
return project(fields(groupSet));
}
}
final Double maxRowCount = mq.getMaxRowCount(peek());
if (maxRowCount != null && maxRowCount <= 1D) {
// If there is at most one row, rel is already unique.
return project(fields(groupSet));
}
}
ImmutableList groupSets;
if (groupKey_.nodeLists != null) {
final int sizeBefore = registrar.extraNodes.size();
final SortedSet groupSetSet =
new TreeSet<>(ImmutableBitSet.ORDERING);
for (ImmutableList nodeList : groupKey_.nodeLists) {
final ImmutableBitSet groupSet2 =
ImmutableBitSet.of(registrar.registerExpressions(nodeList));
if (!groupSet.contains(groupSet2)) {
throw new IllegalArgumentException("group set element " + nodeList
+ " must be a subset of group key");
}
groupSetSet.add(groupSet2);
}
groupSets = ImmutableList.copyOf(groupSetSet);
if (registrar.extraNodes.size() > sizeBefore) {
throw new IllegalArgumentException(
"group sets contained expressions not in group key: "
+ registrar.extraNodes.subList(sizeBefore,
registrar.extraNodes.size()));
}
} else {
groupSets = ImmutableList.of(groupSet);
}
for (AggCall aggCall : aggCalls) {
if (aggCall instanceof AggCallImpl) {
final AggCallImpl aggCall1 = (AggCallImpl) aggCall;
registrar.registerExpressions(aggCall1.operands);
if (aggCall1.filter != null) {
registrar.registerExpression(aggCall1.filter);
}
}
}
project(registrar.extraNodes);
rename(registrar.names);
final Frame frame = stack.pop();
RelNode r = frame.rel;
final List aggregateCalls = new ArrayList<>();
for (AggCall aggCall : aggCalls) {
final AggregateCall aggregateCall;
if (aggCall instanceof AggCallImpl) {
final AggCallImpl aggCall1 = (AggCallImpl) aggCall;
final List args =
registrar.registerExpressions(aggCall1.operands);
final int filterArg = aggCall1.filter == null ? -1
: registrar.registerExpression(aggCall1.filter);
if (aggCall1.distinct && !aggCall1.aggFunction.isQuantifierAllowed()) {
throw new IllegalArgumentException("DISTINCT not allowed");
}
if (aggCall1.filter != null && !aggCall1.aggFunction.allowsFilter()) {
throw new IllegalArgumentException("FILTER not allowed");
}
RelCollation collation =
RelCollations.of(aggCall1.orderKeys
.stream()
.map(orderKey ->
collation(orderKey, RelFieldCollation.Direction.ASCENDING,
null, Collections.emptyList()))
.collect(Collectors.toList()));
aggregateCall =
AggregateCall.create(aggCall1.aggFunction, aggCall1.distinct,
aggCall1.approximate,
aggCall1.ignoreNulls, args, filterArg, collation,
groupSet.cardinality(), r, null, aggCall1.alias);
} else {
aggregateCall = ((AggCallImpl2) aggCall).aggregateCall;
}
aggregateCalls.add(aggregateCall);
}
assert ImmutableBitSet.ORDERING.isStrictlyOrdered(groupSets) : groupSets;
for (ImmutableBitSet set : groupSets) {
assert groupSet.contains(set);
}
List inFields = frame.fields;
if (config.pruneInputOfAggregate()
&& r instanceof Project) {
final Set fieldsUsed =
RelOptUtil.getAllFields2(groupSet, aggregateCalls);
// Some parts of the system can't handle rows with zero fields, so
// pretend that one field is used.
if (fieldsUsed.isEmpty()) {
r = ((Project) r).getInput();
} else if (fieldsUsed.size() < r.getRowType().getFieldCount()) {
// Some fields are computed but not used. Prune them.
final Map map = new HashMap<>();
for (int source : fieldsUsed) {
map.put(source, map.size());
}
groupSet = groupSet.permute(map);
groupSets =
ImmutableBitSet.ORDERING.immutableSortedCopy(
ImmutableBitSet.permute(groupSets, map));
final Mappings.TargetMapping targetMapping =
Mappings.target(map, r.getRowType().getFieldCount(),
fieldsUsed.size());
final List oldAggregateCalls =
new ArrayList<>(aggregateCalls);
aggregateCalls.clear();
for (AggregateCall aggregateCall : oldAggregateCalls) {
aggregateCalls.add(aggregateCall.transform(targetMapping));
}
inFields = Mappings.permute(inFields, targetMapping.inverse());
final Project project = (Project) r;
final List newProjects = new ArrayList<>();
final RelDataTypeFactory.Builder builder =
cluster.getTypeFactory().builder();
for (int i : fieldsUsed) {
newProjects.add(project.getProjects().get(i));
builder.add(project.getRowType().getFieldList().get(i));
}
r = project.copy(cluster.traitSet(), project.getInput(), newProjects,
builder.build());
}
}
if (!config.dedupAggregateCalls() || Util.isDistinct(aggregateCalls)) {
return aggregate_(groupSet, groupSets, r, aggregateCalls,
registrar.extraNodes, inFields);
}
// There are duplicate aggregate calls. Rebuild the list to eliminate
// duplicates, then add a Project.
final Set callSet = new HashSet<>();
final List> projects = new ArrayList<>();
Util.range(groupSet.cardinality())
.forEach(i -> projects.add(Pair.of(i, null)));
final List distinctAggregateCalls = new ArrayList<>();
for (AggregateCall aggregateCall : aggregateCalls) {
final int i;
if (callSet.add(aggregateCall)) {
i = distinctAggregateCalls.size();
distinctAggregateCalls.add(aggregateCall);
} else {
i = distinctAggregateCalls.indexOf(aggregateCall);
assert i >= 0;
}
projects.add(Pair.of(groupSet.cardinality() + i, aggregateCall.name));
}
aggregate_(groupSet, groupSets, r, distinctAggregateCalls,
registrar.extraNodes, inFields);
final List fields = projects.stream()
.map(p -> p.right == null ? field(p.left)
: alias(field(p.left), p.right))
.collect(Collectors.toList());
return project(fields);
}
/** Finishes the implementation of {@link #aggregate} by creating an
* {@link Aggregate} and pushing it onto the stack. */
private RelBuilder aggregate_(ImmutableBitSet groupSet,
ImmutableList groupSets, RelNode input,
List aggregateCalls, List extraNodes,
List inFields) {
final RelNode aggregate =
struct.aggregateFactory.createAggregate(input,
ImmutableList.of(), groupSet, groupSets, aggregateCalls);
// build field list
final ImmutableList.Builder fields = ImmutableList.builder();
final List aggregateFields =
aggregate.getRowType().getFieldList();
int i = 0;
// first, group fields
for (Integer groupField : groupSet.asList()) {
RexNode node = extraNodes.get(groupField);
final SqlKind kind = node.getKind();
switch (kind) {
case INPUT_REF:
fields.add(inFields.get(((RexInputRef) node).getIndex()));
break;
default:
String name = aggregateFields.get(i).getName();
RelDataTypeField fieldType =
new RelDataTypeFieldImpl(name, i, node.getType());
fields.add(new Field(ImmutableSet.of(), fieldType));
break;
}
i++;
}
// second, aggregate fields. retain `i' as field index
for (int j = 0; j < aggregateCalls.size(); ++j) {
final AggregateCall call = aggregateCalls.get(j);
final RelDataTypeField fieldType =
new RelDataTypeFieldImpl(aggregateFields.get(i + j).getName(), i + j,
call.getType());
fields.add(new Field(ImmutableSet.of(), fieldType));
}
stack.push(new Frame(aggregate, fields.build()));
return this;
}
private RelBuilder setOp(boolean all, SqlKind kind, int n) {
List inputs = new LinkedList<>();
for (int i = 0; i < n; i++) {
inputs.add(0, build());
}
switch (kind) {
case UNION:
case INTERSECT:
case EXCEPT:
if (n < 1) {
throw new IllegalArgumentException(
"bad INTERSECT/UNION/EXCEPT input count");
}
break;
default:
throw new AssertionError("bad setOp " + kind);
}
switch (n) {
case 1:
return push(inputs.get(0));
default:
return push(struct.setOpFactory.createSetOp(kind, inputs, all));
}
}
/** Creates a {@link Union} of the two most recent
* relational expressions on the stack.
*
* @param all Whether to create UNION ALL
*/
public RelBuilder union(boolean all) {
return union(all, 2);
}
/** Creates a {@link Union} of the {@code n}
* most recent relational expressions on the stack.
*
* @param all Whether to create UNION ALL
* @param n Number of inputs to the UNION operator
*/
public RelBuilder union(boolean all, int n) {
return setOp(all, SqlKind.UNION, n);
}
/** Creates an {@link Intersect} of the two most
* recent relational expressions on the stack.
*
* @param all Whether to create INTERSECT ALL
*/
public RelBuilder intersect(boolean all) {
return intersect(all, 2);
}
/** Creates an {@link Intersect} of the {@code n}
* most recent relational expressions on the stack.
*
* @param all Whether to create INTERSECT ALL
* @param n Number of inputs to the INTERSECT operator
*/
public RelBuilder intersect(boolean all, int n) {
return setOp(all, SqlKind.INTERSECT, n);
}
/** Creates a {@link Minus} of the two most recent
* relational expressions on the stack.
*
* @param all Whether to create EXCEPT ALL
*/
public RelBuilder minus(boolean all) {
return minus(all, 2);
}
/** Creates a {@link Minus} of the {@code n}
* most recent relational expressions on the stack.
*
* @param all Whether to create EXCEPT ALL
*/
public RelBuilder minus(boolean all, int n) {
return setOp(all, SqlKind.EXCEPT, n);
}
/**
* Creates a {@link TableScan} on a {@link TransientTable} with the given name, using as type
* the top of the stack's type.
*
* @param tableName table name
*/
@Experimental
public RelBuilder transientScan(String tableName) {
return this.transientScan(tableName, this.peek().getRowType());
}
/**
* Creates a {@link TableScan} on a {@link TransientTable} with the given name and type.
*
* @param tableName table name
* @param rowType row type of the table
*/
@Experimental
public RelBuilder transientScan(String tableName, RelDataType rowType) {
TransientTable transientTable = new ListTransientTable(tableName, rowType);
RelOptTable relOptTable = RelOptTableImpl.create(
relOptSchema,
rowType,
transientTable,
ImmutableList.of(tableName));
RelNode scan =
struct.scanFactory.createScan(
ViewExpanders.toRelContext(viewExpander, cluster),
relOptTable);
push(scan);
rename(rowType.getFieldNames());
return this;
}
/**
* Creates a {@link TableSpool} for the most recent relational expression.
*
* @param readType Spool's read type (as described in {@link Spool.Type})
* @param writeType Spool's write type (as described in {@link Spool.Type})
* @param table Table to write into
*/
private RelBuilder tableSpool(Spool.Type readType, Spool.Type writeType,
RelOptTable table) {
RelNode spool =
struct.spoolFactory.createTableSpool(peek(), readType, writeType,
table);
replaceTop(spool);
return this;
}
/**
* Creates a {@link RepeatUnion} associated to a {@link TransientTable} without a maximum number
* of iterations, i.e. repeatUnion(tableName, all, -1).
*
* @param tableName name of the {@link TransientTable} associated to the {@link RepeatUnion}
* @param all whether duplicates will be considered or not
*/
@Experimental
public RelBuilder repeatUnion(String tableName, boolean all) {
return repeatUnion(tableName, all, -1);
}
/**
* Creates a {@link RepeatUnion} associated to a {@link TransientTable} of the
* two most recent relational expressions on the stack.
*
* Warning: if these relational expressions are not
* correctly defined, this operation might lead to an infinite loop.
*
*
The generated {@link RepeatUnion} operates as follows:
*
*
* - Evaluate its left term once, propagating the results into the
* {@link TransientTable};
*
- Evaluate its right term (which may contain a {@link TableScan} on the
* {@link TransientTable}) over and over until it produces no more results
* (or until an optional maximum number of iterations is reached). On each
* iteration, the results are propagated into the {@link TransientTable},
* overwriting the results from the previous one.
*
*
* @param tableName Name of the {@link TransientTable} associated to the
* {@link RepeatUnion}
* @param all Whether duplicates are considered
* @param iterationLimit Maximum number of iterations; negative value means no limit
*/
@Experimental
public RelBuilder repeatUnion(String tableName, boolean all, int iterationLimit) {
RelOptTableFinder finder = new RelOptTableFinder(tableName);
for (int i = 0; i < stack.size(); i++) { // search scan(tableName) in the stack
peek(i).accept(finder);
if (finder.relOptTable != null) { // found
break;
}
}
if (finder.relOptTable == null) {
throw RESOURCE.tableNotFound(tableName).ex();
}
RelNode iterative = tableSpool(Spool.Type.LAZY, Spool.Type.LAZY, finder.relOptTable).build();
RelNode seed = tableSpool(Spool.Type.LAZY, Spool.Type.LAZY, finder.relOptTable).build();
RelNode repeatUnion =
struct.repeatUnionFactory.createRepeatUnion(seed, iterative, all,
iterationLimit);
return push(repeatUnion);
}
/**
* Auxiliary class to find a certain RelOptTable based on its name
*/
private static final class RelOptTableFinder extends RelHomogeneousShuttle {
private RelOptTable relOptTable = null;
private final String tableName;
private RelOptTableFinder(String tableName) {
this.tableName = tableName;
}
@Override public RelNode visit(TableScan scan) {
final RelOptTable scanTable = scan.getTable();
final List qualifiedName = scanTable.getQualifiedName();
if (qualifiedName.get(qualifiedName.size() - 1).equals(tableName)) {
relOptTable = scanTable;
}
return super.visit(scan);
}
}
/** Creates a {@link Join} with an array of conditions. */
public RelBuilder join(JoinRelType joinType, RexNode condition0,
RexNode... conditions) {
return join(joinType, Lists.asList(condition0, conditions));
}
/** Creates a {@link Join} with multiple
* conditions. */
public RelBuilder join(JoinRelType joinType,
Iterable conditions) {
return join(joinType, and(conditions),
ImmutableSet.of());
}
/** Creates a {@link Join} with one condition. */
public RelBuilder join(JoinRelType joinType, RexNode condition) {
return join(joinType, condition, ImmutableSet.of());
}
/** Creates a {@link Join} with correlating variables. */
public RelBuilder join(JoinRelType joinType, RexNode condition,
Set variablesSet) {
Frame right = stack.pop();
final Frame left = stack.pop();
final RelNode join;
final boolean correlate = variablesSet.size() == 1;
RexNode postCondition = literal(true);
if (config.simplify()) {
// Normalize expanded versions IS NOT DISTINCT FROM so that simplifier does not
// transform the expression to something unrecognizable
if (condition instanceof RexCall) {
condition = RelOptUtil.collapseExpandedIsNotDistinctFromExpr((RexCall) condition,
getRexBuilder());
}
condition = simplifier.simplifyUnknownAsFalse(condition);
}
if (correlate) {
final CorrelationId id = Iterables.getOnlyElement(variablesSet);
final ImmutableBitSet requiredColumns =
RelOptUtil.correlationColumns(id, right.rel);
if (!RelOptUtil.notContainsCorrelation(left.rel, id, Litmus.IGNORE)) {
throw new IllegalArgumentException("variable " + id
+ " must not be used by left input to correlation");
}
switch (joinType) {
case LEFT:
// Correlate does not have an ON clause.
// For a LEFT correlate, predicate must be evaluated first.
// For INNER, we can defer.
stack.push(right);
filter(condition.accept(new Shifter(left.rel, id, right.rel)));
right = stack.pop();
break;
default:
postCondition = condition;
}
join =
struct.correlateFactory.createCorrelate(left.rel, right.rel, id,
requiredColumns, joinType);
} else {
join =
struct.joinFactory.createJoin(left.rel, right.rel,
ImmutableList.of(), condition, variablesSet, joinType, false);
}
final ImmutableList.Builder fields = ImmutableList.builder();
fields.addAll(left.fields);
fields.addAll(right.fields);
stack.push(new Frame(join, fields.build()));
filter(postCondition);
return this;
}
/** Creates a {@link Correlate}
* with a {@link CorrelationId} and an array of fields that are used by correlation. */
public RelBuilder correlate(JoinRelType joinType,
CorrelationId correlationId, RexNode... requiredFields) {
return correlate(joinType, correlationId, ImmutableList.copyOf(requiredFields));
}
/** Creates a {@link Correlate}
* with a {@link CorrelationId} and a list of fields that are used by correlation. */
public RelBuilder correlate(JoinRelType joinType,
CorrelationId correlationId, Iterable requiredFields) {
Frame right = stack.pop();
final Registrar registrar =
new Registrar(fields(), peek().getRowType().getFieldNames());
List requiredOrdinals =
registrar.registerExpressions(ImmutableList.copyOf(requiredFields));
project(registrar.extraNodes);
rename(registrar.names);
Frame left = stack.pop();
final RelNode correlate =
struct.correlateFactory.createCorrelate(left.rel, right.rel,
correlationId, ImmutableBitSet.of(requiredOrdinals), joinType);
final ImmutableList.Builder fields = ImmutableList.builder();
fields.addAll(left.fields);
fields.addAll(right.fields);
stack.push(new Frame(correlate, fields.build()));
return this;
}
/** Creates a {@link Join} using USING syntax.
*
* For each of the field names, both left and right inputs must have a
* field of that name. Constructs a join condition that the left and right
* fields are equal.
*
* @param joinType Join type
* @param fieldNames Field names
*/
public RelBuilder join(JoinRelType joinType, String... fieldNames) {
final List conditions = new ArrayList<>();
for (String fieldName : fieldNames) {
conditions.add(
call(SqlStdOperatorTable.EQUALS,
field(2, 0, fieldName),
field(2, 1, fieldName)));
}
return join(joinType, conditions);
}
/** Creates a {@link Join} with {@link JoinRelType#SEMI}.
*
* A semi-join is a form of join that combines two relational expressions
* according to some condition, and outputs only rows from the left input for
* which at least one row from the right input matches. It only outputs
* columns from the left input, and ignores duplicates on the right.
*
*
For example, {@code EMP semi-join DEPT} finds all {@code EMP} records
* that do not have a corresponding {@code DEPT} record, similar to the
* following SQL:
*
*
* SELECT * FROM EMP
* WHERE EXISTS (SELECT 1 FROM DEPT
* WHERE DEPT.DEPTNO = EMP.DEPTNO)
*
*/
public RelBuilder semiJoin(Iterable conditions) {
final Frame right = stack.pop();
final RelNode semiJoin =
struct.joinFactory.createJoin(peek(),
right.rel,
ImmutableList.of(),
and(conditions),
ImmutableSet.of(),
JoinRelType.SEMI,
false);
replaceTop(semiJoin);
return this;
}
/** Creates a {@link Join} with {@link JoinRelType#SEMI}.
*
* @see #semiJoin(Iterable) */
public RelBuilder semiJoin(RexNode... conditions) {
return semiJoin(ImmutableList.copyOf(conditions));
}
/** Creates an anti-join.
*
* An anti-join is a form of join that combines two relational expressions
* according to some condition, but outputs only rows from the left input
* for which no rows from the right input match.
*
*
For example, {@code EMP anti-join DEPT} finds all {@code EMP} records
* that do not have a corresponding {@code DEPT} record, similar to the
* following SQL:
*
*
* SELECT * FROM EMP
* WHERE NOT EXISTS (SELECT 1 FROM DEPT
* WHERE DEPT.DEPTNO = EMP.DEPTNO)
*
*/
public RelBuilder antiJoin(Iterable conditions) {
final Frame right = stack.pop();
final RelNode antiJoin =
struct.joinFactory.createJoin(peek(),
right.rel,
ImmutableList.of(),
and(conditions),
ImmutableSet.of(),
JoinRelType.ANTI,
false);
replaceTop(antiJoin);
return this;
}
/** Creates an anti-join.
*
* @see #antiJoin(Iterable) */
public RelBuilder antiJoin(RexNode... conditions) {
return antiJoin(ImmutableList.copyOf(conditions));
}
/** Assigns a table alias to the top entry on the stack. */
public RelBuilder as(final String alias) {
final Frame pair = stack.pop();
List newFields =
Util.transform(pair.fields, field -> field.addAlias(alias));
stack.push(new Frame(pair.rel, ImmutableList.copyOf(newFields)));
return this;
}
/** Creates a {@link Values}.
*
* The {@code values} array must have the same number of entries as
* {@code fieldNames}, or an integer multiple if you wish to create multiple
* rows.
*
*
If there are zero rows, or if all values of a any column are
* null, this method cannot deduce the type of columns. For these cases,
* call {@link #values(Iterable, RelDataType)}.
*
* @param fieldNames Field names
* @param values Values
*/
public RelBuilder values(String[] fieldNames, Object... values) {
if (fieldNames == null
|| fieldNames.length == 0
|| values.length % fieldNames.length != 0
|| values.length < fieldNames.length) {
throw new IllegalArgumentException(
"Value count must be a positive multiple of field count");
}
final int rowCount = values.length / fieldNames.length;
for (Ord fieldName : Ord.zip(fieldNames)) {
if (allNull(values, fieldName.i, fieldNames.length)) {
throw new IllegalArgumentException("All values of field '" + fieldName.e
+ "' are null; cannot deduce type");
}
}
final ImmutableList> tupleList =
tupleList(fieldNames.length, values);
final RelDataTypeFactory typeFactory = cluster.getTypeFactory();
final RelDataTypeFactory.Builder builder = typeFactory.builder();
for (final Ord fieldName : Ord.zip(fieldNames)) {
final String name =
fieldName.e != null ? fieldName.e : "expr$" + fieldName.i;
final RelDataType type = typeFactory.leastRestrictive(
new AbstractList() {
public RelDataType get(int index) {
return tupleList.get(index).get(fieldName.i).getType();
}
public int size() {
return rowCount;
}
});
builder.add(name, type);
}
final RelDataType rowType = builder.build();
return values(tupleList, rowType);
}
private ImmutableList> tupleList(int columnCount,
Object[] values) {
final ImmutableList.Builder> listBuilder =
ImmutableList.builder();
final List valueList = new ArrayList<>();
for (int i = 0; i < values.length; i++) {
Object value = values[i];
valueList.add((RexLiteral) literal(value));
if ((i + 1) % columnCount == 0) {
listBuilder.add(ImmutableList.copyOf(valueList));
valueList.clear();
}
}
return listBuilder.build();
}
/** Returns whether all values for a given column are null. */
private boolean allNull(Object[] values, int column, int columnCount) {
for (int i = column; i < values.length; i += columnCount) {
if (values[i] != null) {
return false;
}
}
return true;
}
/** Creates a relational expression that reads from an input and throws
* all of the rows away.
*
* Note that this method always pops one relational expression from the
* stack. {@code values}, in contrast, does not pop any relational
* expressions, and always produces a leaf.
*
*
The default implementation creates a {@link Values} with the same
* specified row type and aliases as the input, and ignores the input entirely.
* But schema-on-query systems such as Drill might override this method to
* create a relation expression that retains the input, just to read its
* schema.
*/
public RelBuilder empty() {
final Frame frame = stack.pop();
final RelNode values =
struct.valuesFactory.createValues(cluster, frame.rel.getRowType(),
ImmutableList.of());
stack.push(new Frame(values, frame.fields));
return this;
}
/** Creates a {@link Values} with a specified row type.
*
*
This method can handle cases that {@link #values(String[], Object...)}
* cannot, such as all values of a column being null, or there being zero
* rows.
*
* @param rowType Row type
* @param columnValues Values
*/
public RelBuilder values(RelDataType rowType, Object... columnValues) {
final ImmutableList> tupleList =
tupleList(rowType.getFieldCount(), columnValues);
RelNode values =
struct.valuesFactory.createValues(cluster, rowType,
ImmutableList.copyOf(tupleList));
push(values);
return this;
}
/** Creates a {@link Values} with a specified row type.
*
* This method can handle cases that {@link #values(String[], Object...)}
* cannot, such as all values of a column being null, or there being zero
* rows.
*
* @param tupleList Tuple list
* @param rowType Row type
*/
public RelBuilder values(Iterable> tupleList,
RelDataType rowType) {
RelNode values =
struct.valuesFactory.createValues(cluster, rowType,
copy(tupleList));
push(values);
return this;
}
/** Creates a {@link Values} with a specified row type and
* zero rows.
*
* @param rowType Row type
*/
public RelBuilder values(RelDataType rowType) {
return values(ImmutableList.>of(), rowType);
}
/** Converts an iterable of lists into an immutable list of immutable lists
* with the same contents. Returns the same object if possible. */
private static ImmutableList> copy(
Iterable> tupleList) {
final ImmutableList.Builder> builder =
ImmutableList.builder();
int changeCount = 0;
for (List literals : tupleList) {
final ImmutableList literals2 =
ImmutableList.copyOf(literals);
builder.add(literals2);
if (literals != literals2) {
++changeCount;
}
}
if (changeCount == 0) {
// don't make a copy if we don't have to
//noinspection unchecked
return (ImmutableList>) tupleList;
}
return builder.build();
}
/** Creates a limit without a sort. */
public RelBuilder limit(int offset, int fetch) {
return sortLimit(offset, fetch, ImmutableList.of());
}
/** Creates an Exchange by distribution. */
public RelBuilder exchange(RelDistribution distribution) {
RelNode exchange =
struct.exchangeFactory.createExchange(peek(), distribution);
replaceTop(exchange);
return this;
}
/** Creates a SortExchange by distribution and collation. */
public RelBuilder sortExchange(RelDistribution distribution,
RelCollation collation) {
RelNode exchange =
struct.sortExchangeFactory.createSortExchange(peek(), distribution,
collation);
replaceTop(exchange);
return this;
}
/** Creates a {@link Sort} by field ordinals.
*
* Negative fields mean descending: -1 means field(0) descending,
* -2 means field(1) descending, etc.
*/
public RelBuilder sort(int... fields) {
final ImmutableList.Builder builder = ImmutableList.builder();
for (int field : fields) {
builder.add(field < 0 ? desc(field(-field - 1)) : field(field));
}
return sortLimit(-1, -1, builder.build());
}
/** Creates a {@link Sort} by expressions. */
public RelBuilder sort(RexNode... nodes) {
return sortLimit(-1, -1, ImmutableList.copyOf(nodes));
}
/** Creates a {@link Sort} by expressions. */
public RelBuilder sort(Iterable nodes) {
return sortLimit(-1, -1, nodes);
}
/** Creates a {@link Sort} by expressions, with limit and offset. */
public RelBuilder sortLimit(int offset, int fetch, RexNode... nodes) {
return sortLimit(offset, fetch, ImmutableList.copyOf(nodes));
}
/** Creates a {@link Sort} by a list of expressions, with limit and offset.
*
* @param offset Number of rows to skip; non-positive means don't skip any
* @param fetch Maximum number of rows to fetch; negative means no limit
* @param nodes Sort expressions
*/
public RelBuilder sortLimit(int offset, int fetch,
Iterable nodes) {
final Registrar registrar = new Registrar(fields());
final List fieldCollations =
registrar.registerFieldCollations(nodes);
final RexNode offsetNode = offset <= 0 ? null : literal(offset);
final RexNode fetchNode = fetch < 0 ? null : literal(fetch);
if (offsetNode == null && fetch == 0) {
return empty();
}
if (offsetNode == null && fetchNode == null && fieldCollations.isEmpty()) {
return this; // sort is trivial
}
if (fieldCollations.isEmpty()) {
assert registrar.addedFieldCount() == 0;
RelNode top = peek();
if (top instanceof Sort) {
final Sort sort2 = (Sort) top;
if (sort2.offset == null && sort2.fetch == null) {
replaceTop(sort2.getInput());
final RelNode sort =
struct.sortFactory.createSort(peek(), sort2.collation,
offsetNode, fetchNode);
replaceTop(sort);
return this;
}
}
if (top instanceof Project) {
final Project project = (Project) top;
if (project.getInput() instanceof Sort) {
final Sort sort2 = (Sort) project.getInput();
if (sort2.offset == null && sort2.fetch == null) {
final RelNode sort =
struct.sortFactory.createSort(sort2.getInput(),
sort2.collation, offsetNode, fetchNode);
replaceTop(
struct.projectFactory.createProject(sort,
project.getHints(),
project.getProjects(),
Pair.right(project.getNamedProjects())));
return this;
}
}
}
}
if (registrar.addedFieldCount() > 0) {
project(registrar.extraNodes);
}
final RelNode sort =
struct.sortFactory.createSort(peek(),
RelCollations.of(fieldCollations), offsetNode, fetchNode);
replaceTop(sort);
if (registrar.addedFieldCount() > 0) {
project(registrar.originalExtraNodes);
}
return this;
}
private static RelFieldCollation collation(RexNode node,
RelFieldCollation.Direction direction,
RelFieldCollation.NullDirection nullDirection, List extraNodes) {
switch (node.getKind()) {
case INPUT_REF:
return new RelFieldCollation(((RexInputRef) node).getIndex(), direction,
Util.first(nullDirection, direction.defaultNullDirection()));
case DESCENDING:
return collation(((RexCall) node).getOperands().get(0),
RelFieldCollation.Direction.DESCENDING,
nullDirection, extraNodes);
case NULLS_FIRST:
return collation(((RexCall) node).getOperands().get(0), direction,
RelFieldCollation.NullDirection.FIRST, extraNodes);
case NULLS_LAST:
return collation(((RexCall) node).getOperands().get(0), direction,
RelFieldCollation.NullDirection.LAST, extraNodes);
default:
final int fieldIndex = extraNodes.size();
extraNodes.add(node);
return new RelFieldCollation(fieldIndex, direction,
Util.first(nullDirection, direction.defaultNullDirection()));
}
}
/**
* Creates a projection that converts the current relational expression's
* output to a desired row type.
*
* @param castRowType row type after cast
* @param rename if true, use field names from castRowType; if false,
* preserve field names from rel
*/
public RelBuilder convert(RelDataType castRowType, boolean rename) {
final RelNode r = build();
final RelNode r2 =
RelOptUtil.createCastRel(r, castRowType, rename,
struct.projectFactory);
push(r2);
return this;
}
public RelBuilder permute(Mapping mapping) {
assert mapping.getMappingType().isSingleSource();
assert mapping.getMappingType().isMandatorySource();
if (mapping.isIdentity()) {
return this;
}
final List exprList = new ArrayList<>();
for (int i = 0; i < mapping.getTargetCount(); i++) {
exprList.add(field(mapping.getSource(i)));
}
return project(exprList);
}
/** Creates a {@link Match}. */
public RelBuilder match(RexNode pattern, boolean strictStart,
boolean strictEnd, Map patternDefinitions,
Iterable measureList, RexNode after,
Map> subsets, boolean allRows,
Iterable partitionKeys,
Iterable orderKeys, RexNode interval) {
final Registrar registrar =
new Registrar(fields(), peek().getRowType().getFieldNames());
final List fieldCollations =
registrar.registerFieldCollations(orderKeys);
final ImmutableBitSet partitionBitSet =
ImmutableBitSet.of(registrar.registerExpressions(partitionKeys));
final RelDataTypeFactory.Builder typeBuilder = cluster.getTypeFactory().builder();
for (RexNode partitionKey : partitionKeys) {
typeBuilder.add(partitionKey.toString(), partitionKey.getType());
}
if (allRows) {
for (RexNode orderKey : orderKeys) {
if (!typeBuilder.nameExists(orderKey.toString())) {
typeBuilder.add(orderKey.toString(), orderKey.getType());
}
}
final RelDataType inputRowType = peek().getRowType();
for (RelDataTypeField fs : inputRowType.getFieldList()) {
if (!typeBuilder.nameExists(fs.getName())) {
typeBuilder.add(fs);
}
}
}
final ImmutableMap.Builder measures = ImmutableMap.builder();
for (RexNode measure : measureList) {
List operands = ((RexCall) measure).getOperands();
String alias = operands.get(1).toString();
typeBuilder.add(alias, operands.get(0).getType());
measures.put(alias, operands.get(0));
}
final RelNode match =
struct.matchFactory.createMatch(peek(), pattern,
typeBuilder.build(), strictStart, strictEnd, patternDefinitions,
measures.build(), after, subsets, allRows,
partitionBitSet, RelCollations.of(fieldCollations), interval);
stack.push(new Frame(match));
return this;
}
/**
* Attaches an array of hints to the stack top relational expression.
*
* The redundant hints would be eliminated.
*
* @param hints Hints
*
* @throws AssertionError if the top relational expression does not implement
* {@link com.hazelcast.org.apache.calcite.rel.hint.Hintable}
*/
public RelBuilder hints(RelHint... hints) {
return hints(ImmutableList.copyOf(hints));
}
/**
* Attaches multiple hints to the stack top relational expression.
*
*
The redundant hints would be eliminated.
*
* @param hints Hints
*
* @throws AssertionError if the top relational expression does not implement
* {@link com.hazelcast.org.apache.calcite.rel.hint.Hintable}
*/
public RelBuilder hints(Iterable hints) {
Objects.requireNonNull(hints);
final Frame frame = peek_();
assert frame != null : "There is no relational expression to attach the hints";
assert frame.rel instanceof Hintable : "The top relational expression is not a Hintable";
Hintable hintable = (Hintable) frame.rel;
replaceTop(hintable.attachHints(ImmutableList.copyOf(hints)));
return this;
}
/** Clears the stack.
*
* The builder's state is now the same as when it was created. */
public void clear() {
stack.clear();
}
/** Information necessary to create a call to an aggregate function.
*
* @see RelBuilder#aggregateCall */
public interface AggCall {
/** Returns a copy of this AggCall that applies a filter before aggregating
* values. */
AggCall filter(RexNode condition);
/** Returns a copy of this AggCall that sorts its input values by
* {@code orderKeys} before aggregating, as in SQL's {@code WITHIN GROUP}
* clause. */
AggCall sort(Iterable orderKeys);
/** Returns a copy of this AggCall that sorts its input values by
* {@code orderKeys} before aggregating, as in SQL's {@code WITHIN GROUP}
* clause. */
AggCall sort(RexNode... orderKeys);
/** Returns a copy of this AggCall that may return approximate results
* if {@code approximate} is true. */
AggCall approximate(boolean approximate);
/** Returns a copy of this AggCall that ignores nulls. */
AggCall ignoreNulls(boolean ignoreNulls);
/** Returns a copy of this AggCall with a given alias. */
AggCall as(String alias);
/** Returns a copy of this AggCall that is optionally distinct. */
AggCall distinct(boolean distinct);
/** Returns a copy of this AggCall that is distinct. */
AggCall distinct();
}
/** Information necessary to create the GROUP BY clause of an Aggregate.
*
* @see RelBuilder#groupKey */
public interface GroupKey {
/** Assigns an alias to this group key.
*
* Used to assign field names in the {@code group} operation. */
GroupKey alias(String alias);
}
/** Implementation of {@link RelBuilder.GroupKey}. */
public static class GroupKeyImpl implements GroupKey {
public final ImmutableList nodes;
public final ImmutableList> nodeLists;
public final String alias;
GroupKeyImpl(ImmutableList nodes,
ImmutableList> nodeLists, String alias) {
this.nodes = Objects.requireNonNull(nodes);
this.nodeLists = nodeLists;
this.alias = alias;
}
@Override public String toString() {
return alias == null ? nodes.toString() : nodes + " as " + alias;
}
public GroupKey alias(String alias) {
return Objects.equals(this.alias, alias)
? this
: new GroupKeyImpl(nodes, nodeLists, alias);
}
}
/** Implementation of {@link AggCall}. */
private class AggCallImpl implements AggCall {
private final SqlAggFunction aggFunction;
private final boolean distinct;
private final boolean approximate;
private final boolean ignoreNulls;
private final RexNode filter; // may be null
private final String alias; // may be null
private final ImmutableList operands; // may be empty, never null
private final ImmutableList orderKeys; // may be empty, never null
AggCallImpl(SqlAggFunction aggFunction, boolean distinct,
boolean approximate, boolean ignoreNulls, RexNode filter,
String alias, ImmutableList operands,
ImmutableList orderKeys) {
this.aggFunction = Objects.requireNonNull(aggFunction);
// If the aggregate function ignores DISTINCT,
// make the DISTINCT flag FALSE.
this.distinct = distinct
&& aggFunction.getDistinctOptionality() != Optionality.IGNORED;
this.approximate = approximate;
this.ignoreNulls = ignoreNulls;
this.alias = alias;
this.operands = Objects.requireNonNull(operands);
this.orderKeys = Objects.requireNonNull(orderKeys);
if (filter != null) {
if (filter.getType().getSqlTypeName() != SqlTypeName.BOOLEAN) {
throw RESOURCE.filterMustBeBoolean().ex();
}
if (filter.getType().isNullable()) {
filter = call(SqlStdOperatorTable.IS_TRUE, filter);
}
}
this.filter = filter;
}
@Override public String toString() {
final StringBuilder b = new StringBuilder();
b.append(aggFunction.getName())
.append('(');
if (distinct) {
b.append("DISTINCT ");
}
final int iMax = operands.size() - 1;
for (int i = 0; ; i++) {
b.append(operands.get(i));
if (i == iMax) {
break;
}
b.append(", ");
}
b.append(')');
if (filter != null) {
b.append(" FILTER (WHERE ").append(filter).append(')');
}
return b.toString();
}
public AggCall sort(Iterable orderKeys) {
final ImmutableList orderKeyList =
ImmutableList.copyOf(orderKeys);
return orderKeyList.equals(this.orderKeys)
? this
: new AggCallImpl(aggFunction, distinct, approximate, ignoreNulls,
filter, alias, operands, orderKeyList);
}
public AggCall sort(RexNode... orderKeys) {
return sort(ImmutableList.copyOf(orderKeys));
}
public AggCall approximate(boolean approximate) {
return approximate == this.approximate
? this
: new AggCallImpl(aggFunction, distinct, approximate, ignoreNulls,
filter, alias, operands, orderKeys);
}
public AggCall filter(RexNode condition) {
return Objects.equals(condition, this.filter)
? this
: new AggCallImpl(aggFunction, distinct, approximate, ignoreNulls,
condition, alias, operands, orderKeys);
}
public AggCall as(String alias) {
return Objects.equals(alias, this.alias)
? this
: new AggCallImpl(aggFunction, distinct, approximate, ignoreNulls,
filter, alias, operands, orderKeys);
}
public AggCall distinct(boolean distinct) {
return distinct == this.distinct
? this
: new AggCallImpl(aggFunction, distinct, approximate, ignoreNulls,
filter, alias, operands, orderKeys);
}
public AggCall distinct() {
return distinct(true);
}
public AggCall ignoreNulls(boolean ignoreNulls) {
return ignoreNulls == this.ignoreNulls
? this
: new AggCallImpl(aggFunction, distinct, approximate, ignoreNulls,
filter, alias, operands, orderKeys);
}
}
/** Implementation of {@link AggCall} that wraps an
* {@link AggregateCall}. */
private static class AggCallImpl2 implements AggCall {
private final AggregateCall aggregateCall;
AggCallImpl2(AggregateCall aggregateCall) {
this.aggregateCall = Objects.requireNonNull(aggregateCall);
}
@Override public String toString() {
return aggregateCall.toString();
}
public AggCall sort(Iterable orderKeys) {
throw new UnsupportedOperationException();
}
public AggCall sort(RexNode... orderKeys) {
throw new UnsupportedOperationException();
}
public AggCall approximate(boolean approximate) {
throw new UnsupportedOperationException();
}
public AggCall filter(RexNode condition) {
throw new UnsupportedOperationException();
}
public AggCall as(String alias) {
throw new UnsupportedOperationException();
}
public AggCall distinct(boolean distinct) {
throw new UnsupportedOperationException();
}
public AggCall distinct() {
throw new UnsupportedOperationException();
}
public AggCall ignoreNulls(boolean ignoreNulls) {
throw new UnsupportedOperationException();
}
}
/** Collects the extra expressions needed for {@link #aggregate}.
*
* The extra expressions come from the group key and as arguments to
* aggregate calls, and later there will be a {@link #project} or a
* {@link #rename(List)} if necessary. */
private static class Registrar {
final List originalExtraNodes;
final List extraNodes;
final List names = new ArrayList<>();
Registrar(Iterable fields) {
this(fields, ImmutableList.of());
}
Registrar(Iterable fields, List fieldNames) {
originalExtraNodes = ImmutableList.copyOf(fields);
extraNodes = new ArrayList<>(originalExtraNodes);
names.addAll(fieldNames);
}
int registerExpression(RexNode node) {
switch (node.getKind()) {
case AS:
final List operands = ((RexCall) node).operands;
int i = registerExpression(operands.get(0));
names.set(i, RexLiteral.stringValue(operands.get(1)));
return i;
}
int i = extraNodes.indexOf(node);
if (i < 0) {
i = extraNodes.size();
extraNodes.add(node);
names.add(null);
}
return i;
}
List registerExpressions(Iterable nodes) {
final List builder = new ArrayList<>();
for (RexNode node : nodes) {
builder.add(registerExpression(node));
}
return builder;
}
List registerFieldCollations(
Iterable orderKeys) {
final List fieldCollations = new ArrayList<>();
for (RexNode orderKey : orderKeys) {
final RelFieldCollation collation =
collation(orderKey, RelFieldCollation.Direction.ASCENDING, null,
extraNodes);
if (!RelCollations.ordinals(fieldCollations)
.contains(collation.getFieldIndex())) {
fieldCollations.add(collation);
}
}
return ImmutableList.copyOf(fieldCollations);
}
/** Returns the number of fields added. */
int addedFieldCount() {
return extraNodes.size() - originalExtraNodes.size();
}
}
/** Builder stack frame.
*
* Describes a previously created relational expression and
* information about how table aliases map into its row type. */
private static class Frame {
final RelNode rel;
final ImmutableList fields;
private Frame(RelNode rel, ImmutableList fields) {
this.rel = rel;
this.fields = fields;
}
private Frame(RelNode rel) {
String tableAlias = deriveAlias(rel);
ImmutableList.Builder builder = ImmutableList.builder();
ImmutableSet aliases = tableAlias == null
? ImmutableSet.of()
: ImmutableSet.of(tableAlias);
for (RelDataTypeField field : rel.getRowType().getFieldList()) {
builder.add(new Field(aliases, field));
}
this.rel = rel;
this.fields = builder.build();
}
@Override public String toString() {
return rel + ": " + fields;
}
private static String deriveAlias(RelNode rel) {
if (rel instanceof TableScan) {
final List names = rel.getTable().getQualifiedName();
if (!names.isEmpty()) {
return Util.last(names);
}
}
return null;
}
List fields() {
return Pair.right(fields);
}
}
/** A field that belongs to a stack {@link Frame}. */
private static class Field
extends Pair, RelDataTypeField> {
Field(ImmutableSet left, RelDataTypeField right) {
super(left, right);
}
Field addAlias(String alias) {
if (left.contains(alias)) {
return this;
}
final ImmutableSet aliasList =
ImmutableSet.builder().addAll(left).add(alias).build();
return new Field(aliasList, right);
}
}
/** Shuttle that shifts a predicate's inputs to the left, replacing early
* ones with references to a
* {@link RexCorrelVariable}. */
private class Shifter extends RexShuttle {
private final RelNode left;
private final CorrelationId id;
private final RelNode right;
Shifter(RelNode left, CorrelationId id, RelNode right) {
this.left = left;
this.id = id;
this.right = right;
}
public RexNode visitInputRef(RexInputRef inputRef) {
final RelDataType leftRowType = left.getRowType();
final RexBuilder rexBuilder = getRexBuilder();
final int leftCount = leftRowType.getFieldCount();
if (inputRef.getIndex() < leftCount) {
final RexNode v = rexBuilder.makeCorrel(leftRowType, id);
return rexBuilder.makeFieldAccess(v, inputRef.getIndex());
} else {
return rexBuilder.makeInputRef(right, inputRef.getIndex() - leftCount);
}
}
}
/** Configuration of RelBuilder.
*
* It is immutable, and all fields are public.
*
*
Start with the {@link #DEFAULT} instance,
* and call {@code withXxx} methods to set its properties. */
public interface Config {
/** Default configuration. */
Config DEFAULT = ImmutableBeans.create(Config.class);
@Deprecated // to be removed before 2.0
static ConfigBuilder builder() {
return DEFAULT.toBuilder();
}
@Deprecated // to be removed before 2.0
default ConfigBuilder toBuilder() {
return new ConfigBuilder(this);
}
/** Controls whether to merge two {@link Project} operators when inlining
* expressions causes complexity to increase.
*
*
Usually merging projects is beneficial, but occasionally the
* result is more complex than the original projects. Consider:
*
*
* P: Project(a+b+c AS x, d+e+f AS y, g+h+i AS z) # complexity 15
* Q: Project(x*y*z AS p, x-y-z AS q) # complexity 10
* R: Project((a+b+c)*(d+e+f)*(g+h+i) AS s,
* (a+b+c)-(d+e+f)-(g+h+i) AS t) # complexity 34
*
*
* The complexity of an expression is the number of nodes (leaves and
* operators). For example, {@code a+b+c} has complexity 5 (3 field
* references and 2 calls):
*
*
* +
* / \
* + c
* / \
* a b
*
*
* A negative value never allows merges.
*
*
A zero or positive value, {@code bloat}, allows a merge if complexity
* of the result is less than or equal to the sum of the complexity of the
* originals plus {@code bloat}.
*
*
The default value, 100, allows a moderate increase in complexity but
* prevents cases where complexity would run away into the millions and run
* out of memory. Moderate complexity is OK; the implementation, say via
* {@link com.hazelcast.org.apache.calcite.adapter.enumerable.EnumerableCalc}, will often
* gather common sub-expressions and compute them only once.
*/
@ImmutableBeans.Property
@ImmutableBeans.IntDefault(100)
int bloat();
/** Sets {@link #bloat}. */
Config withBloat(int bloat);
/** Whether {@link RelBuilder#aggregate} should eliminate duplicate
* aggregate calls; default true. */
@ImmutableBeans.Property
@ImmutableBeans.BooleanDefault(true)
boolean dedupAggregateCalls();
/** Sets {@link #dedupAggregateCalls}. */
Config withDedupAggregateCalls(boolean dedupAggregateCalls);
/** Whether {@link RelBuilder#aggregate} should prune unused
* input columns; default true. */
@ImmutableBeans.Property
@ImmutableBeans.BooleanDefault(true)
boolean pruneInputOfAggregate();
/** Sets {@link #pruneInputOfAggregate}. */
Config withPruneInputOfAggregate(boolean pruneInputOfAggregate);
/** Whether to simplify expressions; default true. */
@ImmutableBeans.Property
@ImmutableBeans.BooleanDefault(true)
boolean simplify();
/** Sets {@link #simplify}. */
Config withSimplify(boolean simplify);
}
/** Creates a {@link RelBuilder.Config}.
*
* @deprecated Use the {@code withXxx} methods in
* {@link RelBuilder.Config}. */
@Deprecated // to be removed before 2.0
public static class ConfigBuilder {
private Config config;
private ConfigBuilder(@Nonnull Config config) {
this.config = config;
}
/** Creates a {@link RelBuilder.Config}. */
public Config build() {
return config;
}
/** Sets the value that will become
* {@link com.hazelcast.org.apache.calcite.tools.RelBuilder.Config#dedupAggregateCalls}. */
public ConfigBuilder withDedupAggregateCalls(boolean dedupAggregateCalls) {
config = config.withDedupAggregateCalls(dedupAggregateCalls);
return this;
}
/** Sets the value that will become
* {@link com.hazelcast.org.apache.calcite.tools.RelBuilder.Config#simplify}. */
public ConfigBuilder withSimplify(boolean simplify) {
config = config.withSimplify(simplify);
return this;
}
}
}