com.hazelcast.org.apache.calcite.adapter.enumerable.EnumerableUncollect Maven / Gradle / Ivy
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* 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.
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package com.hazelcast.org.apache.calcite.adapter.enumerable;
import com.hazelcast.org.apache.calcite.linq4j.tree.BlockBuilder;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expression;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expressions;
import com.hazelcast.org.apache.calcite.plan.RelOptCluster;
import com.hazelcast.org.apache.calcite.plan.RelTraitSet;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.Uncollect;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeField;
import com.hazelcast.org.apache.calcite.runtime.SqlFunctions.FlatProductInputType;
import com.hazelcast.org.apache.calcite.sql.type.MapSqlType;
import com.hazelcast.org.apache.calcite.util.BuiltInMethod;
import com.hazelcast.com.google.common.primitives.Ints;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import static com.hazelcast.org.apache.calcite.sql.type.NonNullableAccessors.getComponentTypeOrThrow;
/** Implementation of {@link com.hazelcast.org.apache.calcite.rel.core.Uncollect} in
* {@link com.hazelcast.org.apache.calcite.adapter.enumerable.EnumerableConvention enumerable calling convention}. */
public class EnumerableUncollect extends Uncollect implements EnumerableRel {
@Deprecated // to be removed before 2.0
public EnumerableUncollect(RelOptCluster cluster, RelTraitSet traitSet,
RelNode child) {
this(cluster, traitSet, child, false);
}
/** Creates an EnumerableUncollect.
*
* Use {@link #create} unless you know what you're doing. */
public EnumerableUncollect(RelOptCluster cluster, RelTraitSet traitSet,
RelNode child, boolean withOrdinality) {
super(cluster, traitSet, child, withOrdinality, Collections.emptyList());
assert getConvention() instanceof EnumerableConvention;
assert getConvention() == child.getConvention();
}
/**
* Creates an EnumerableUncollect.
*
*
Each field of the input relational expression must be an array or
* multiset.
*
* @param traitSet Trait set
* @param input Input relational expression
* @param withOrdinality Whether output should contain an ORDINALITY column
*/
public static EnumerableUncollect create(RelTraitSet traitSet, RelNode input,
boolean withOrdinality) {
final RelOptCluster cluster = input.getCluster();
return new EnumerableUncollect(cluster, traitSet, input, withOrdinality);
}
@Override public EnumerableUncollect copy(RelTraitSet traitSet,
RelNode newInput) {
return new EnumerableUncollect(getCluster(), traitSet, newInput,
withOrdinality);
}
@Override public Result implement(EnumerableRelImplementor implementor, Prefer pref) {
final BlockBuilder builder = new BlockBuilder();
final EnumerableRel child = (EnumerableRel) getInput();
final Result result = implementor.visitChild(this, 0, child, pref);
final PhysType physType =
PhysTypeImpl.of(
implementor.getTypeFactory(),
getRowType(),
JavaRowFormat.LIST);
// final Enumerable> child = <>;
// return child.selectMany(FLAT_PRODUCT);
final Expression child_ =
builder.append(
"child", result.block);
final List fieldCounts = new ArrayList<>();
final List inputTypes = new ArrayList<>();
Expression lambdaForStructWithSingleItem = null;
for (RelDataTypeField field : child.getRowType().getFieldList()) {
final RelDataType type = field.getType();
if (type instanceof MapSqlType) {
fieldCounts.add(2);
inputTypes.add(FlatProductInputType.MAP);
} else {
final RelDataType elementType = getComponentTypeOrThrow(type);
if (elementType.isStruct()) {
if (elementType.getFieldCount() == 1 && child.getRowType().getFieldList().size() == 1
&& !withOrdinality) {
// Solves CALCITE-4063: if we are processing a single field, which is a struct with a
// single item inside, and no ordinality; the result must be a scalar, hence use a
// special lambda that does not return lists, but the (single) items within those lists
lambdaForStructWithSingleItem = Expressions.call(BuiltInMethod.FLAT_LIST.method);
} else {
fieldCounts.add(elementType.getFieldCount());
inputTypes.add(FlatProductInputType.LIST);
}
} else {
fieldCounts.add(-1);
inputTypes.add(FlatProductInputType.SCALAR);
}
}
}
final Expression lambda = lambdaForStructWithSingleItem != null
? lambdaForStructWithSingleItem
: Expressions.call(BuiltInMethod.FLAT_PRODUCT.method,
Expressions.constant(Ints.toArray(fieldCounts)),
Expressions.constant(withOrdinality),
Expressions.constant(
inputTypes.toArray(new FlatProductInputType[0])));
builder.add(
Expressions.return_(null,
Expressions.call(child_,
BuiltInMethod.SELECT_MANY.method,
lambda)));
return implementor.result(physType, builder.toBlock());
}
}