com.hazelcast.org.apache.calcite.rel.rules.ProjectSortTransposeRule 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.rel.rules;
import com.hazelcast.org.apache.calcite.plan.RelOptRule;
import com.hazelcast.org.apache.calcite.plan.RelOptRuleCall;
import com.hazelcast.org.apache.calcite.plan.RelOptRuleOperand;
import com.hazelcast.org.apache.calcite.rel.RelNode;
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.Sort;
import com.hazelcast.org.apache.calcite.tools.RelBuilderFactory;
import com.hazelcast.com.google.com.hazelcast.com.on.collect.ImmutableList;
/**
* Planner rule that pushes
* a {@link com.hazelcast.org.apache.calcite.rel.core.Project}
* past a {@link com.hazelcast.org.apache.calcite.rel.core.Sort}.
*
* @see com.hazelcast.org.apache.calcite.rel.rules.SortProjectTransposeRule
*/
public class ProjectSortTransposeRule extends RelOptRule implements TransformationRule {
public static final ProjectSortTransposeRule INSTANCE =
new ProjectSortTransposeRule(Project.class, Sort.class,
RelFactories.LOGICAL_BUILDER);
//~ Constructors -----------------------------------------------------------
/** Creates a ProjectSortTransposeRule. */
private ProjectSortTransposeRule(Class projectClass,
Class sortClass, RelBuilderFactory relBuilderFactory) {
this(
operand(projectClass,
operand(sortClass, any())),
relBuilderFactory, null);
}
@Deprecated // to be removed before 2.0
protected ProjectSortTransposeRule(RelOptRuleOperand operand) {
this(operand, RelFactories.LOGICAL_BUILDER, null);
}
/** Creates a ProjectSortTransposeRule with an operand. */
protected ProjectSortTransposeRule(RelOptRuleOperand operand,
RelBuilderFactory relBuilderFactory, String description) {
super(operand, relBuilderFactory, description);
}
//~ Methods ----------------------------------------------------------------
public void onMatch(RelOptRuleCall call) {
final Project project = call.rel(0);
final Sort sort = call.rel(1);
if (sort.getClass() != Sort.class) {
return;
}
RelNode newProject =
project.copy(
project.getTraitSet(), ImmutableList.of(sort.getInput()));
final Sort newSort =
sort.copy(
sort.getTraitSet(),
newProject,
sort.getCollation(),
sort.offset,
sort.fetch);
call.transformTo(newSort);
}
}