com.hazelcast.org.apache.calcite.sql.validate.AbstractNamespace 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 com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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.sql.validate;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.util.Pair;
import com.hazelcast.org.apache.calcite.util.Util;
import com.hazelcast.com.google.com.hazelcast.com.on.base.Preconditions;
import com.hazelcast.com.google.com.hazelcast.com.on.collect.ImmutableList;
import java.util.List;
/**
* Abstract implementation of {@link SqlValidatorNamespace}.
*/
abstract class AbstractNamespace implements SqlValidatorNamespace {
//~ Instance fields --------------------------------------------------------
protected final SqlValidatorImpl validator;
/**
* Whether this scope is currently being validated. Used to check for
* cycles.
*/
private SqlValidatorImpl.Status status =
SqlValidatorImpl.Status.UNVALIDATED;
/**
* Type of the output row, which com.hazelcast.com.rises the name and type of each output
* column. Set on validate.
*/
protected RelDataType rowType;
/** As {@link #rowType}, but not necessarily a struct. */
protected RelDataType type;
protected final SqlNode enclosingNode;
//~ Constructors -----------------------------------------------------------
/**
* Creates an AbstractNamespace.
*
* @param validator Validator
* @param enclosingNode Enclosing node
*/
AbstractNamespace(
SqlValidatorImpl validator,
SqlNode enclosingNode) {
this.validator = validator;
this.enclosingNode = enclosingNode;
}
//~ Methods ----------------------------------------------------------------
public SqlValidator getValidator() {
return validator;
}
public final void validate(RelDataType targetRowType) {
switch (status) {
case UNVALIDATED:
try {
status = SqlValidatorImpl.Status.IN_PROGRESS;
Preconditions.checkArgument(rowType == null,
"Namespace.rowType must be null before validate has been called");
RelDataType type = validateImpl(targetRowType);
Preconditions.checkArgument(type != null,
"validateImpl() returned null");
setType(type);
} finally {
status = SqlValidatorImpl.Status.VALID;
}
break;
case IN_PROGRESS:
throw new AssertionError("Cycle detected during type-checking");
case VALID:
break;
default:
throw Util.unexpected(status);
}
}
/**
* Validates this scope and returns the type of the records it returns.
* External users should call {@link #validate}, which uses the
* {@link #status} field to protect against cycles.
*
* @return record data type, never null
*
* @param targetRowType Desired row type, must not be null, may be the data
* type 'unknown'.
*/
protected abstract RelDataType validateImpl(RelDataType targetRowType);
public RelDataType getRowType() {
if (rowType == null) {
validator.validateNamespace(this, validator.unknownType);
Preconditions.checkArgument(rowType != null, "validate must set rowType");
}
return rowType;
}
public RelDataType getRowTypeSansSystemColumns() {
return getRowType();
}
public RelDataType getType() {
Util.discard(getRowType());
return type;
}
public void setType(RelDataType type) {
this.type = type;
this.rowType = convertToStruct(type);
}
public SqlNode getEnclosingNode() {
return enclosingNode;
}
public SqlValidatorTable getTable() {
return null;
}
public SqlValidatorNamespace lookupChild(String name) {
return validator.lookupFieldNamespace(
getRowType(),
name);
}
public boolean fieldExists(String name) {
final RelDataType rowType = getRowType();
return validator.catalogReader.nameMatcher().field(rowType, name) != null;
}
public List> getMonotonicExprs() {
return ImmutableList.of();
}
public SqlMonotonicity getMonotonicity(String columnName) {
return SqlMonotonicity.NOT_MONOTONIC;
}
@SuppressWarnings("deprecation")
public void makeNullable() {
}
public String translate(String name) {
return name;
}
public SqlValidatorNamespace resolve() {
return this;
}
public boolean supportsModality(SqlModality modality) {
return true;
}
public T unwrap(Class clazz) {
return clazz.cast(this);
}
public boolean isWrapperFor(Class clazz) {
return clazz.isInstance(this);
}
protected RelDataType convertToStruct(RelDataType type) {
// "MULTISET [, ...]" needs to be wrapped in a record if
// has a scalar type.
// For example, "MULTISET [8, 9]" has type
// "RECORD(INTEGER EXPR$0 NOT NULL) NOT NULL MULTISET NOT NULL".
final RelDataType com.hazelcast.com.onentType = type.getComponentType();
if (com.hazelcast.com.onentType == null || com.hazelcast.com.onentType.isStruct()) {
return type;
}
final RelDataTypeFactory typeFactory = validator.getTypeFactory();
final RelDataType structType = toStruct(com.hazelcast.com.onentType, getNode());
final RelDataType collectionType;
switch (type.getSqlTypeName()) {
case ARRAY:
collectionType = typeFactory.createArrayType(structType, -1);
break;
case MULTISET:
collectionType = typeFactory.createMultisetType(structType, -1);
break;
default:
throw new AssertionError(type);
}
return typeFactory.createTypeWithNullability(collectionType,
type.isNullable());
}
/** Converts a type to a struct if it is not already. */
protected RelDataType toStruct(RelDataType type, SqlNode unnest) {
if (type.isStruct()) {
return type;
}
return validator.getTypeFactory().builder()
.add(validator.deriveAlias(unnest, 0), type)
.build();
}
}