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com.hazelcast.org.apache.calcite.adapter.enumerable.EnumerableWindow 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.adapter.enumerable;
import com.hazelcast.org.apache.calcite.adapter.enumerable.impl.WinAggAddContextImpl;
import com.hazelcast.org.apache.calcite.adapter.enumerable.impl.WinAggResetContextImpl;
import com.hazelcast.org.apache.calcite.adapter.enumerable.impl.WinAggResultContextImpl;
import com.hazelcast.org.apache.calcite.adapter.java.JavaTypeFactory;
import com.hazelcast.org.apache.calcite.config.CalciteSystemProperty;
import com.hazelcast.org.apache.calcite.linq4j.tree.BinaryExpression;
import com.hazelcast.org.apache.calcite.linq4j.tree.BlockBuilder;
import com.hazelcast.org.apache.calcite.linq4j.tree.BlockStatement;
import com.hazelcast.org.apache.calcite.linq4j.tree.DeclarationStatement;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expression;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expressions;
import com.hazelcast.org.apache.calcite.linq4j.tree.ParameterExpression;
import com.hazelcast.org.apache.calcite.linq4j.tree.Primitive;
import com.hazelcast.org.apache.calcite.linq4j.tree.Statement;
import com.hazelcast.org.apache.calcite.linq4j.tree.Types;
import com.hazelcast.org.apache.calcite.plan.RelOptCluster;
import com.hazelcast.org.apache.calcite.plan.RelOptCost;
import com.hazelcast.org.apache.calcite.plan.RelOptPlanner;
import com.hazelcast.org.apache.calcite.plan.RelTraitSet;
import com.hazelcast.org.apache.calcite.rel.RelFieldCollation;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.AggregateCall;
import com.hazelcast.org.apache.calcite.rel.core.Window;
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.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.RexWindowBound;
import com.hazelcast.org.apache.calcite.runtime.SortedMultiMap;
import com.hazelcast.org.apache.calcite.sql.SqlAggFunction;
import com.hazelcast.org.apache.calcite.sql.validate.SqlConformance;
import com.hazelcast.org.apache.calcite.util.BuiltInMethod;
import com.hazelcast.org.apache.calcite.util.ImmutableBitSet;
import com.hazelcast.org.apache.calcite.util.Pair;
import com.hazelcast.org.apache.calcite.util.Util;
import com.hazelcast.com.google.common.collect.ImmutableList;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.function.Function;
/** Implementation of {@link com.hazelcast.org.apache.calcite.rel.core.Window} in
* {@link com.hazelcast.org.apache.calcite.adapter.enumerable.EnumerableConvention enumerable calling convention}. */
public class EnumerableWindow extends Window implements EnumerableRel {
/** Creates an EnumerableWindowRel. */
EnumerableWindow(RelOptCluster cluster, RelTraitSet traits, RelNode child,
List constants, RelDataType rowType, List groups) {
super(cluster, traits, child, constants, rowType, groups);
}
@Override public RelNode copy(RelTraitSet traitSet, List inputs) {
return new EnumerableWindow(getCluster(), traitSet, sole(inputs),
constants, rowType, groups);
}
public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq) {
return super.computeSelfCost(planner, mq)
.multiplyBy(EnumerableConvention.COST_MULTIPLIER);
}
/** Implementation of {@link RexToLixTranslator.InputGetter}
* suitable for generating implementations of windowed aggregate
* functions. */
private static class WindowRelInputGetter
implements RexToLixTranslator.InputGetter {
private final Expression row;
private final PhysType rowPhysType;
private final int actualInputFieldCount;
private final List constants;
private WindowRelInputGetter(Expression row,
PhysType rowPhysType, int actualInputFieldCount,
List constants) {
this.row = row;
this.rowPhysType = rowPhysType;
this.actualInputFieldCount = actualInputFieldCount;
this.constants = constants;
}
public Expression field(BlockBuilder list, int index, Type storageType) {
if (index < actualInputFieldCount) {
Expression current = list.append("current", row);
return rowPhysType.fieldReference(current, index, storageType);
}
return constants.get(index - actualInputFieldCount);
}
}
private void sampleOfTheGeneratedWindowedAggregate() {
// Here's overview of the generated code
// For each list of rows that have the same partitioning key, evaluate
// all of the windowed aggregate functions.
// builder
Iterator iterator = null;
// builder3
Integer[] rows = iterator.next();
int prevStart = -1;
int prevEnd = -1;
for (int i = 0; i < rows.length; i++) {
// builder4
Integer row = rows[i];
int start = 0;
int end = 100;
if (start != prevStart || end != prevEnd) {
// builder5
int actualStart = 0;
if (start != prevStart || end < prevEnd) {
// builder6
// recompute
actualStart = start;
// implementReset
} else { // must be start == prevStart && end > prevEnd
actualStart = prevEnd + 1;
}
prevStart = start;
prevEnd = end;
if (start != -1) {
for (int j = actualStart; j <= end; j++) {
// builder7
// implementAdd
}
}
// implementResult
// list.add(new Xxx(row.deptno, row.empid, sum, count));
}
}
// multiMap.clear(); // allows gc
// source = Linq4j.asEnumerable(list);
}
public Result implement(EnumerableRelImplementor implementor, Prefer pref) {
final JavaTypeFactory typeFactory = implementor.getTypeFactory();
final EnumerableRel child = (EnumerableRel) getInput();
final BlockBuilder builder = new BlockBuilder();
final Result result = implementor.visitChild(this, 0, child, pref);
Expression source_ = builder.append("source", result.block);
final List translatedConstants =
new ArrayList<>(constants.size());
for (RexLiteral constant : constants) {
translatedConstants.add(
RexToLixTranslator.translateLiteral(constant, constant.getType(),
typeFactory, RexImpTable.NullAs.NULL));
}
PhysType inputPhysType = result.physType;
ParameterExpression prevStart =
Expressions.parameter(int.class, builder.newName("prevStart"));
ParameterExpression prevEnd =
Expressions.parameter(int.class, builder.newName("prevEnd"));
builder.add(Expressions.declare(0, prevStart, null));
builder.add(Expressions.declare(0, prevEnd, null));
for (int windowIdx = 0; windowIdx < groups.size(); windowIdx++) {
Group group = groups.get(windowIdx);
// Comparator:
// final Comparator comparator =
// new Comparator() {
// public int compare(JdbcTest.Employee o1,
// JdbcTest.Employee o2) {
// return Integer.compare(o1.empid, o2.empid);
// }
// };
final Expression comparator_ =
builder.append(
"comparator",
inputPhysType.generateComparator(
group.collation()));
Pair partitionIterator =
getPartitionIterator(builder, source_, inputPhysType, group,
comparator_);
final Expression collectionExpr = partitionIterator.left;
final Expression iterator_ = partitionIterator.right;
List aggs = new ArrayList<>();
List aggregateCalls = group.getAggregateCalls(this);
for (int aggIdx = 0; aggIdx < aggregateCalls.size(); aggIdx++) {
AggregateCall call = aggregateCalls.get(aggIdx);
if (call.ignoreNulls()) {
throw new UnsupportedOperationException("IGNORE NULLS not supported");
}
aggs.add(new AggImpState(aggIdx, call, true));
}
// The output from this stage is the input plus the aggregate functions.
final RelDataTypeFactory.Builder typeBuilder = typeFactory.builder();
typeBuilder.addAll(inputPhysType.getRowType().getFieldList());
for (AggImpState agg : aggs) {
typeBuilder.add(agg.call.name, agg.call.type);
}
RelDataType outputRowType = typeBuilder.build();
final PhysType outputPhysType =
PhysTypeImpl.of(
typeFactory, outputRowType, pref.prefer(result.format));
final Expression list_ =
builder.append(
"list",
Expressions.new_(
ArrayList.class,
Expressions.call(
collectionExpr, BuiltInMethod.COLLECTION_SIZE.method)),
false);
Pair collationKey =
getRowCollationKey(builder, inputPhysType, group, windowIdx);
Expression keySelector = collationKey.left;
Expression keyComparator = collationKey.right;
final BlockBuilder builder3 = new BlockBuilder();
final Expression rows_ =
builder3.append(
"rows",
Expressions.convert_(
Expressions.call(
iterator_, BuiltInMethod.ITERATOR_NEXT.method),
Object[].class),
false);
builder3.add(
Expressions.statement(
Expressions.assign(prevStart, Expressions.constant(-1))));
builder3.add(
Expressions.statement(
Expressions.assign(prevEnd,
Expressions.constant(Integer.MAX_VALUE))));
final BlockBuilder builder4 = new BlockBuilder();
final ParameterExpression i_ =
Expressions.parameter(int.class, builder4.newName("i"));
final Expression row_ =
builder4.append(
"row",
EnumUtils.convert(
Expressions.arrayIndex(rows_, i_),
inputPhysType.getJavaRowType()));
final RexToLixTranslator.InputGetter inputGetter =
new WindowRelInputGetter(row_, inputPhysType,
result.physType.getRowType().getFieldCount(),
translatedConstants);
final RexToLixTranslator translator =
RexToLixTranslator.forAggregation(typeFactory, builder4,
inputGetter, implementor.getConformance());
final List outputRow = new ArrayList<>();
int fieldCountWithAggResults =
inputPhysType.getRowType().getFieldCount();
for (int i = 0; i < fieldCountWithAggResults; i++) {
outputRow.add(
inputPhysType.fieldReference(
row_, i,
outputPhysType.getJavaFieldType(i)));
}
declareAndResetState(typeFactory, builder, result, windowIdx, aggs,
outputPhysType, outputRow);
// There are assumptions that minX==0. If ever change this, look for
// frameRowCount, bounds checking, etc
final Expression minX = Expressions.constant(0);
final Expression partitionRowCount =
builder3.append("partRows", Expressions.field(rows_, "length"));
final Expression maxX = builder3.append("maxX",
Expressions.subtract(
partitionRowCount, Expressions.constant(1)));
final Expression startUnchecked = builder4.append("start",
translateBound(translator, i_, row_, minX, maxX, rows_,
group, true,
inputPhysType, comparator_, keySelector, keyComparator));
final Expression endUnchecked = builder4.append("end",
translateBound(translator, i_, row_, minX, maxX, rows_,
group, false,
inputPhysType, comparator_, keySelector, keyComparator));
final Expression startX;
final Expression endX;
final Expression hasRows;
if (group.isAlwaysNonEmpty()) {
startX = startUnchecked;
endX = endUnchecked;
hasRows = Expressions.constant(true);
} else {
Expression startTmp =
group.lowerBound.isUnbounded() || startUnchecked == i_
? startUnchecked
: builder4.append("startTmp",
Expressions.call(null, BuiltInMethod.MATH_MAX.method,
startUnchecked, minX));
Expression endTmp =
group.upperBound.isUnbounded() || endUnchecked == i_
? endUnchecked
: builder4.append("endTmp",
Expressions.call(null, BuiltInMethod.MATH_MIN.method,
endUnchecked, maxX));
ParameterExpression startPe = Expressions.parameter(0, int.class,
builder4.newName("startChecked"));
ParameterExpression endPe = Expressions.parameter(0, int.class,
builder4.newName("endChecked"));
builder4.add(Expressions.declare(Modifier.FINAL, startPe, null));
builder4.add(Expressions.declare(Modifier.FINAL, endPe, null));
hasRows = builder4.append("hasRows",
Expressions.lessThanOrEqual(startTmp, endTmp));
builder4.add(
Expressions.ifThenElse(hasRows,
Expressions.block(
Expressions.statement(
Expressions.assign(startPe, startTmp)),
Expressions.statement(
Expressions.assign(endPe, endTmp))),
Expressions.block(
Expressions.statement(
Expressions.assign(startPe, Expressions.constant(-1))),
Expressions.statement(
Expressions.assign(endPe, Expressions.constant(-1))))));
startX = startPe;
endX = endPe;
}
final BlockBuilder builder5 = new BlockBuilder(true, builder4);
BinaryExpression rowCountWhenNonEmpty = Expressions.add(
startX == minX ? endX : Expressions.subtract(endX, startX),
Expressions.constant(1));
final Expression frameRowCount;
if (hasRows.equals(Expressions.constant(true))) {
frameRowCount =
builder4.append("totalRows", rowCountWhenNonEmpty);
} else {
frameRowCount =
builder4.append("totalRows",
Expressions.condition(hasRows, rowCountWhenNonEmpty,
Expressions.constant(0)));
}
ParameterExpression actualStart = Expressions.parameter(
0, int.class, builder5.newName("actualStart"));
final BlockBuilder builder6 = new BlockBuilder(true, builder5);
builder6.add(
Expressions.statement(Expressions.assign(actualStart, startX)));
for (final AggImpState agg : aggs) {
agg.implementor.implementReset(agg.context,
new WinAggResetContextImpl(builder6, agg.state, i_, startX, endX,
hasRows, partitionRowCount, frameRowCount));
}
Expression lowerBoundCanChange =
group.lowerBound.isUnbounded() && group.lowerBound.isPreceding()
? Expressions.constant(false)
: Expressions.notEqual(startX, prevStart);
Expression needRecomputeWindow = Expressions.orElse(
lowerBoundCanChange,
Expressions.lessThan(endX, prevEnd));
BlockStatement resetWindowState = builder6.toBlock();
if (resetWindowState.statements.size() == 1) {
builder5.add(
Expressions.declare(0, actualStart,
Expressions.condition(needRecomputeWindow, startX,
Expressions.add(prevEnd, Expressions.constant(1)))));
} else {
builder5.add(
Expressions.declare(0, actualStart, null));
builder5.add(
Expressions.ifThenElse(needRecomputeWindow,
resetWindowState,
Expressions.statement(
Expressions.assign(actualStart,
Expressions.add(prevEnd, Expressions.constant(1))))));
}
if (lowerBoundCanChange instanceof BinaryExpression) {
builder5.add(
Expressions.statement(Expressions.assign(prevStart, startX)));
}
builder5.add(
Expressions.statement(Expressions.assign(prevEnd, endX)));
final BlockBuilder builder7 = new BlockBuilder(true, builder5);
final DeclarationStatement jDecl =
Expressions.declare(0, "j", actualStart);
final PhysType inputPhysTypeFinal = inputPhysType;
final Function
resultContextBuilder =
getBlockBuilderWinAggFrameResultContextFunction(typeFactory,
implementor.getConformance(), result, translatedConstants,
comparator_, rows_, i_, startX, endX, minX, maxX,
hasRows, frameRowCount, partitionRowCount,
jDecl, inputPhysTypeFinal);
final Function> rexArguments = agg -> {
List argList = agg.call.getArgList();
List inputTypes =
EnumUtils.fieldRowTypes(
result.physType.getRowType(),
constants,
argList);
List args = new ArrayList<>(inputTypes.size());
for (int i = 0; i < argList.size(); i++) {
Integer idx = argList.get(i);
args.add(new RexInputRef(idx, inputTypes.get(i)));
}
return args;
};
implementAdd(aggs, builder7, resultContextBuilder, rexArguments, jDecl);
BlockStatement forBlock = builder7.toBlock();
if (!forBlock.statements.isEmpty()) {
// For instance, row_number does not use for loop to compute the value
Statement forAggLoop = Expressions.for_(
Arrays.asList(jDecl),
Expressions.lessThanOrEqual(jDecl.parameter, endX),
Expressions.preIncrementAssign(jDecl.parameter),
forBlock);
if (!hasRows.equals(Expressions.constant(true))) {
forAggLoop = Expressions.ifThen(hasRows, forAggLoop);
}
builder5.add(forAggLoop);
}
if (implementResult(aggs, builder5, resultContextBuilder, rexArguments,
true)) {
builder4.add(
Expressions.ifThen(
Expressions.orElse(lowerBoundCanChange,
Expressions.notEqual(endX, prevEnd)),
builder5.toBlock()));
}
implementResult(aggs, builder4, resultContextBuilder, rexArguments,
false);
builder4.add(
Expressions.statement(
Expressions.call(
list_,
BuiltInMethod.COLLECTION_ADD.method,
outputPhysType.record(outputRow))));
builder3.add(
Expressions.for_(
Expressions.declare(0, i_, Expressions.constant(0)),
Expressions.lessThan(
i_,
Expressions.field(rows_, "length")),
Expressions.preIncrementAssign(i_),
builder4.toBlock()));
builder.add(
Expressions.while_(
Expressions.call(
iterator_,
BuiltInMethod.ITERATOR_HAS_NEXT.method),
builder3.toBlock()));
builder.add(
Expressions.statement(
Expressions.call(
collectionExpr,
BuiltInMethod.MAP_CLEAR.method)));
// We're not assigning to "source". For each group, create a new
// final variable called "source" or "sourceN".
source_ =
builder.append(
"source",
Expressions.call(
BuiltInMethod.AS_ENUMERABLE.method, list_));
inputPhysType = outputPhysType;
}
// return Linq4j.asEnumerable(list);
builder.add(
Expressions.return_(null, source_));
return implementor.result(inputPhysType, builder.toBlock());
}
private Function
getBlockBuilderWinAggFrameResultContextFunction(
final JavaTypeFactory typeFactory, final SqlConformance conformance,
final Result result, final List translatedConstants,
final Expression comparator_,
final Expression rows_, final ParameterExpression i_,
final Expression startX, final Expression endX,
final Expression minX, final Expression maxX,
final Expression hasRows, final Expression frameRowCount,
final Expression partitionRowCount,
final DeclarationStatement jDecl,
final PhysType inputPhysType) {
return block -> new WinAggFrameResultContext() {
public RexToLixTranslator rowTranslator(Expression rowIndex) {
Expression row =
getRow(rowIndex);
final RexToLixTranslator.InputGetter inputGetter =
new WindowRelInputGetter(row, inputPhysType,
result.physType.getRowType().getFieldCount(),
translatedConstants);
return RexToLixTranslator.forAggregation(typeFactory,
block, inputGetter, conformance);
}
public Expression computeIndex(Expression offset,
WinAggImplementor.SeekType seekType) {
Expression index;
if (seekType == WinAggImplementor.SeekType.AGG_INDEX) {
index = jDecl.parameter;
} else if (seekType == WinAggImplementor.SeekType.SET) {
index = i_;
} else if (seekType == WinAggImplementor.SeekType.START) {
index = startX;
} else if (seekType == WinAggImplementor.SeekType.END) {
index = endX;
} else {
throw new IllegalArgumentException("SeekSet " + seekType
+ " is not supported");
}
if (!Expressions.constant(0).equals(offset)) {
index = block.append("idx", Expressions.add(index, offset));
}
return index;
}
private Expression checkBounds(Expression rowIndex,
Expression minIndex, Expression maxIndex) {
if (rowIndex == i_ || rowIndex == startX || rowIndex == endX) {
// No additional bounds check required
return hasRows;
}
//noinspection UnnecessaryLocalVariable
Expression res = block.append("rowInFrame",
Expressions.foldAnd(
ImmutableList.of(hasRows,
Expressions.greaterThanOrEqual(rowIndex, minIndex),
Expressions.lessThanOrEqual(rowIndex, maxIndex))));
return res;
}
public Expression rowInFrame(Expression rowIndex) {
return checkBounds(rowIndex, startX, endX);
}
public Expression rowInPartition(Expression rowIndex) {
return checkBounds(rowIndex, minX, maxX);
}
public Expression compareRows(Expression a, Expression b) {
return Expressions.call(comparator_,
BuiltInMethod.COMPARATOR_COMPARE.method,
getRow(a), getRow(b));
}
public Expression getRow(Expression rowIndex) {
return block.append(
"jRow",
EnumUtils.convert(
Expressions.arrayIndex(rows_, rowIndex),
inputPhysType.getJavaRowType()));
}
public Expression index() {
return i_;
}
public Expression startIndex() {
return startX;
}
public Expression endIndex() {
return endX;
}
public Expression hasRows() {
return hasRows;
}
public Expression getFrameRowCount() {
return frameRowCount;
}
public Expression getPartitionRowCount() {
return partitionRowCount;
}
};
}
private Pair getPartitionIterator(
BlockBuilder builder,
Expression source_,
PhysType inputPhysType,
Group group,
Expression comparator_) {
// Populate map of lists, one per partition
// final Map> multiMap =
// new SortedMultiMap>();
// source.foreach(
// new Function1() {
// public Void apply(Employee v) {
// final Integer k = v.deptno;
// multiMap.putMulti(k, v);
// return null;
// }
// });
// final List list = new ArrayList(multiMap.size());
// Iterator iterator = multiMap.arrays(comparator);
//
if (group.keys.isEmpty()) {
// If partition key is empty, no need to partition.
//
// final List tempList =
// source.into(new ArrayList());
// Iterator iterator =
// SortedMultiMap.singletonArrayIterator(comparator, tempList);
// final List list = new ArrayList(tempList.size());
final Expression tempList_ = builder.append(
"tempList",
Expressions.convert_(
Expressions.call(
source_,
BuiltInMethod.INTO.method,
Expressions.new_(ArrayList.class)),
List.class));
return Pair.of(tempList_,
builder.append(
"iterator",
Expressions.call(
null,
BuiltInMethod.SORTED_MULTI_MAP_SINGLETON.method,
comparator_,
tempList_)));
}
Expression multiMap_ =
builder.append(
"multiMap", Expressions.new_(SortedMultiMap.class));
final BlockBuilder builder2 = new BlockBuilder();
final ParameterExpression v_ =
Expressions.parameter(inputPhysType.getJavaRowType(),
builder2.newName("v"));
Pair> selector =
inputPhysType.selector(v_, group.keys.asList(), JavaRowFormat.CUSTOM);
final ParameterExpression key_;
if (selector.left instanceof Types.RecordType) {
Types.RecordType keyJavaType = (Types.RecordType) selector.left;
List initExpressions = selector.right;
key_ = Expressions.parameter(keyJavaType, "key");
builder2.add(Expressions.declare(0, key_, null));
builder2.add(
Expressions.statement(
Expressions.assign(key_, Expressions.new_(keyJavaType))));
List fieldList = keyJavaType.getRecordFields();
for (int i = 0; i < initExpressions.size(); i++) {
Expression right = initExpressions.get(i);
builder2.add(
Expressions.statement(
Expressions.assign(
Expressions.field(key_, fieldList.get(i)), right)));
}
} else {
DeclarationStatement declare =
Expressions.declare(0, "key", selector.right.get(0));
builder2.add(declare);
key_ = declare.parameter;
}
builder2.add(
Expressions.statement(
Expressions.call(
multiMap_,
BuiltInMethod.SORTED_MULTI_MAP_PUT_MULTI.method,
key_,
v_)));
builder2.add(
Expressions.return_(
null, Expressions.constant(null)));
builder.add(
Expressions.statement(
Expressions.call(
source_,
BuiltInMethod.ENUMERABLE_FOREACH.method,
Expressions.lambda(
builder2.toBlock(), v_))));
return Pair.of(multiMap_,
builder.append(
"iterator",
Expressions.call(
multiMap_,
BuiltInMethod.SORTED_MULTI_MAP_ARRAYS.method,
comparator_)));
}
private Pair getRowCollationKey(
BlockBuilder builder, PhysType inputPhysType,
Group group, int windowIdx) {
if (!(group.isRows
|| (group.upperBound.isUnbounded() && group.lowerBound.isUnbounded()))) {
Pair pair =
inputPhysType.generateCollationKey(
group.collation().getFieldCollations());
// optimize=false to prevent inlining of object create into for-loops
return Pair.of(
builder.append("keySelector" + windowIdx, pair.left, false),
builder.append("keyComparator" + windowIdx, pair.right, false));
} else {
return Pair.of(null, null);
}
}
private void declareAndResetState(final JavaTypeFactory typeFactory,
BlockBuilder builder, final Result result, int windowIdx,
List aggs, PhysType outputPhysType,
List outputRow) {
for (final AggImpState agg : aggs) {
agg.context =
new WinAggContext() {
public SqlAggFunction aggregation() {
return agg.call.getAggregation();
}
public RelDataType returnRelType() {
return agg.call.type;
}
public Type returnType() {
return EnumUtils.javaClass(typeFactory, returnRelType());
}
public List parameterTypes() {
return EnumUtils.fieldTypes(typeFactory,
parameterRelTypes());
}
public List parameterRelTypes() {
return EnumUtils.fieldRowTypes(result.physType.getRowType(),
constants, agg.call.getArgList());
}
public List groupSets() {
throw new UnsupportedOperationException();
}
public List keyOrdinals() {
throw new UnsupportedOperationException();
}
public List keyRelTypes() {
throw new UnsupportedOperationException();
}
public List keyTypes() {
throw new UnsupportedOperationException();
}
};
String aggName = "a" + agg.aggIdx;
if (CalciteSystemProperty.DEBUG.value()) {
aggName = Util.toJavaId(agg.call.getAggregation().getName(), 0)
.substring("ID$0$".length()) + aggName;
}
List state = agg.implementor.getStateType(agg.context);
final List decls = new ArrayList<>(state.size());
for (int i = 0; i < state.size(); i++) {
Type type = state.get(i);
ParameterExpression pe =
Expressions.parameter(type,
builder.newName(aggName
+ "s" + i + "w" + windowIdx));
builder.add(Expressions.declare(0, pe, null));
decls.add(pe);
}
agg.state = decls;
Type aggHolderType = agg.context.returnType();
Type aggStorageType =
outputPhysType.getJavaFieldType(outputRow.size());
if (Primitive.is(aggHolderType) && !Primitive.is(aggStorageType)) {
aggHolderType = Primitive.box(aggHolderType);
}
ParameterExpression aggRes = Expressions.parameter(0,
aggHolderType,
builder.newName(aggName + "w" + windowIdx));
builder.add(
Expressions.declare(0, aggRes,
Expressions.constant(Primitive.is(aggRes.getType())
? Primitive.of(aggRes.getType()).defaultValue
: null,
aggRes.getType())));
agg.result = aggRes;
outputRow.add(aggRes);
agg.implementor.implementReset(agg.context,
new WinAggResetContextImpl(builder, agg.state,
null, null, null, null, null, null));
}
}
private void implementAdd(List aggs,
final BlockBuilder builder7,
final Function frame,
final Function> rexArguments,
final DeclarationStatement jDecl) {
for (final AggImpState agg : aggs) {
final WinAggAddContext addContext =
new WinAggAddContextImpl(builder7, agg.state, frame) {
public Expression currentPosition() {
return jDecl.parameter;
}
public List rexArguments() {
return rexArguments.apply(agg);
}
public RexNode rexFilterArgument() {
return null; // REVIEW
}
};
agg.implementor.implementAdd(agg.context, addContext);
}
}
private boolean implementResult(List aggs,
final BlockBuilder builder,
final Function frame,
final Function> rexArguments,
boolean cachedBlock) {
boolean nonEmpty = false;
for (final AggImpState agg : aggs) {
boolean needCache = true;
if (agg.implementor instanceof WinAggImplementor) {
WinAggImplementor imp = (WinAggImplementor) agg.implementor;
needCache = imp.needCacheWhenFrameIntact();
}
if (needCache ^ cachedBlock) {
// Regular aggregates do not change when the windowing frame keeps
// the same. Ths
continue;
}
nonEmpty = true;
Expression res = agg.implementor.implementResult(agg.context,
new WinAggResultContextImpl(builder, agg.state, frame) {
public List rexArguments() {
return rexArguments.apply(agg);
}
});
// Several count(a) and count(b) might share the result
Expression aggRes = builder.append("a" + agg.aggIdx + "res",
EnumUtils.convert(res, agg.result.getType()));
builder.add(
Expressions.statement(Expressions.assign(agg.result, aggRes)));
}
return nonEmpty;
}
private Expression translateBound(RexToLixTranslator translator,
ParameterExpression i_, Expression row_, Expression min_,
Expression max_, Expression rows_, Group group,
boolean lower,
PhysType physType, Expression rowComparator,
Expression keySelector, Expression keyComparator) {
RexWindowBound bound = lower ? group.lowerBound : group.upperBound;
if (bound.isUnbounded()) {
return bound.isPreceding() ? min_ : max_;
}
if (group.isRows) {
if (bound.isCurrentRow()) {
return i_;
}
RexNode node = bound.getOffset();
Expression offs = translator.translate(node);
// Floating offset does not make sense since we refer to array index.
// Nulls do not make sense as well.
offs = EnumUtils.convert(offs, int.class);
Expression b = i_;
if (bound.isFollowing()) {
b = Expressions.add(b, offs);
} else {
b = Expressions.subtract(b, offs);
}
return b;
}
Expression searchLower = min_;
Expression searchUpper = max_;
if (bound.isCurrentRow()) {
if (lower) {
searchUpper = i_;
} else {
searchLower = i_;
}
}
List fieldCollations =
group.collation().getFieldCollations();
if (bound.isCurrentRow() && fieldCollations.size() != 1) {
return Expressions.call(
(lower
? BuiltInMethod.BINARY_SEARCH5_LOWER
: BuiltInMethod.BINARY_SEARCH5_UPPER).method,
rows_, row_, searchLower, searchUpper, keySelector, keyComparator);
}
assert fieldCollations.size() == 1
: "When using range window specification, ORDER BY should have"
+ " exactly one expression."
+ " Actual collation is " + group.collation();
// isRange
int orderKey =
fieldCollations.get(0).getFieldIndex();
RelDataType keyType =
physType.getRowType().getFieldList().get(orderKey).getType();
Type desiredKeyType = translator.typeFactory.getJavaClass(keyType);
if (bound.getOffset() == null) {
desiredKeyType = Primitive.box(desiredKeyType);
}
Expression val = translator.translate(
new RexInputRef(orderKey, keyType), desiredKeyType);
if (!bound.isCurrentRow()) {
RexNode node = bound.getOffset();
Expression offs = translator.translate(node);
// TODO: support date + interval somehow
if (bound.isFollowing()) {
val = Expressions.add(val, offs);
} else {
val = Expressions.subtract(val, offs);
}
}
return Expressions.call(
(lower
? BuiltInMethod.BINARY_SEARCH6_LOWER
: BuiltInMethod.BINARY_SEARCH6_UPPER).method,
rows_, val, searchLower, searchUpper, keySelector, keyComparator);
}
}
