org.apache.hadoop.hive.ql.optimizer.calcite.rules.HiveRelFieldTrimmer Maven / Gradle / Ivy
The newest version!
/**
* 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 org.apache.hadoop.hive.ql.optimizer.calcite.rules;
import java.util.Set;
import org.apache.calcite.rel.RelCollation;
import org.apache.calcite.rel.RelFieldCollation;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.core.RelFactories;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.calcite.rel.type.RelDataTypeField;
import org.apache.calcite.sql.validate.SqlValidator;
import org.apache.calcite.sql2rel.RelFieldTrimmer;
import org.apache.calcite.util.ImmutableBitSet;
import org.apache.calcite.util.Util;
import com.google.common.collect.ImmutableList;
public class HiveRelFieldTrimmer extends RelFieldTrimmer {
public HiveRelFieldTrimmer(SqlValidator validator) {
super(validator);
}
public HiveRelFieldTrimmer(SqlValidator validator,
RelFactories.ProjectFactory projectFactory,
RelFactories.FilterFactory filterFactory,
RelFactories.JoinFactory joinFactory,
RelFactories.SemiJoinFactory semiJoinFactory,
RelFactories.SortFactory sortFactory,
RelFactories.AggregateFactory aggregateFactory,
RelFactories.SetOpFactory setOpFactory) {
super(validator, projectFactory, filterFactory, joinFactory,
semiJoinFactory, sortFactory, aggregateFactory, setOpFactory);
}
protected TrimResult trimChild(
RelNode rel,
RelNode input,
ImmutableBitSet fieldsUsed,
Set extraFields) {
Util.discard(rel);
if (input.getClass().getName().endsWith("MedMdrClassExtentRel")) {
// MedMdrJoinRule cannot handle Join of Project of
// MedMdrClassExtentRel, only naked MedMdrClassExtentRel.
// So, disable trimming.
fieldsUsed = ImmutableBitSet.range(input.getRowType().getFieldCount());
}
final ImmutableList collations =
RelMetadataQuery.collations(input);
for (RelCollation collation : collations) {
for (RelFieldCollation fieldCollation : collation.getFieldCollations()) {
fieldsUsed = fieldsUsed.set(fieldCollation.getFieldIndex());
}
}
return dispatchTrimFields(input, fieldsUsed, extraFields);
}
}