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/*
* 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.drill.exec.planner.logical;
import org.apache.calcite.plan.RelOptRule;
import org.apache.calcite.plan.RelOptRuleCall;
import org.apache.calcite.plan.RelOptUtil;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.core.Project;
import org.apache.calcite.rel.logical.LogicalProject;
import org.apache.calcite.rex.RexUtil;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.tools.RelBuilder;
import org.apache.calcite.util.Permutation;
import org.apache.drill.exec.expr.fn.FunctionImplementationRegistry;
import org.apache.calcite.rel.core.RelFactories.ProjectFactory;
import org.apache.calcite.rex.RexCall;
import org.apache.calcite.rex.RexNode;
import org.apache.drill.exec.planner.DrillRelBuilder;
import org.apache.drill.exec.planner.physical.PrelFactories;
import java.util.List;
import java.util.ArrayList;
import java.util.List;
/**
* Rule for merging two projects provided the projects aren't projecting identical sets of
* input references.
*
* NOTE: This rules does not extend the Calcite ProjectMergeRule
* because of CALCITE-2223. Once, fixed this rule be changed accordingly. Please see DRILL-6501.
*/
public class DrillMergeProjectRule extends RelOptRule {
private FunctionImplementationRegistry functionRegistry;
private static DrillMergeProjectRule INSTANCE = null;
private final boolean force;
public static DrillMergeProjectRule getInstance(boolean force, ProjectFactory pFactory,
FunctionImplementationRegistry functionRegistry) {
if (INSTANCE == null) {
INSTANCE = new DrillMergeProjectRule(force, pFactory, functionRegistry);
}
return INSTANCE;
}
private DrillMergeProjectRule(boolean force, ProjectFactory pFactory,
FunctionImplementationRegistry functionRegistry) {
super(operand(LogicalProject.class,
operand(LogicalProject.class, any())),
DrillRelBuilder.proto(pFactory),
"DrillMergeProjectRule" + (force ? ":force_mode" : ""));
this.force = force;
this.functionRegistry = functionRegistry;
}
@Override
public boolean matches(RelOptRuleCall call) {
Project topProject = call.rel(0);
Project bottomProject = call.rel(1);
// We have a complex output type do not fire the merge project rule
if (checkComplexOutput(topProject) || checkComplexOutput(bottomProject)) {
return false;
}
return true;
}
private boolean checkComplexOutput(Project project) {
for (RexNode expr: project.getChildExps()) {
if (expr instanceof RexCall) {
if (functionRegistry.isFunctionComplexOutput(((RexCall) expr).getOperator().getName())) {
return true;
}
}
}
return false;
}
@Override
public void onMatch(RelOptRuleCall call) {
final Project topProject = call.rel(0);
final Project bottomProject = call.rel(1);
final RelBuilder relBuilder = call.builder();
// If one or both projects are permutations, short-circuit the complex logic
// of building a RexProgram.
final Permutation topPermutation = topProject.getPermutation();
if (topPermutation != null) {
if (topPermutation.isIdentity()) {
// Let ProjectRemoveRule handle this.
return;
}
final Permutation bottomPermutation = bottomProject.getPermutation();
if (bottomPermutation != null) {
if (bottomPermutation.isIdentity()) {
// Let ProjectRemoveRule handle this.
return;
}
final Permutation product = topPermutation.product(bottomPermutation);
relBuilder.push(bottomProject.getInput());
relBuilder.project(relBuilder.fields(product),
topProject.getRowType().getFieldNames());
call.transformTo(relBuilder.build());
return;
}
}
// If we're not in force mode and the two projects reference identical
// inputs, then return and let ProjectRemoveRule replace the projects.
if (!force) {
if (RexUtil.isIdentity(topProject.getProjects(),
topProject.getInput().getRowType())) {
return;
}
}
final List<RexNode> pushedProjects =
RelOptUtil.pushPastProject(topProject.getProjects(), bottomProject);
final List<RexNode> newProjects = simplifyCast(pushedProjects);
final RelNode input = bottomProject.getInput();
if (RexUtil.isIdentity(newProjects, input.getRowType())) {
if (force
|| input.getRowType().getFieldNames()
.equals(topProject.getRowType().getFieldNames())) {
call.transformTo(input);
return;
}
}
// replace the two projects with a combined projection
relBuilder.push(bottomProject.getInput());
relBuilder.project(newProjects, topProject.getRowType().getFieldNames());
call.transformTo(relBuilder.build());
}
public static List<RexNode> simplifyCast(List<RexNode> projectExprs) {
final List<RexNode> list = new ArrayList<>();
for (RexNode rex: projectExprs) {
if (rex.getKind() == SqlKind.CAST) {
RexNode operand = ((RexCall) rex).getOperands().get(0);
while (operand.getKind() == SqlKind.CAST
&& operand.getType().equals(rex.getType())) {
rex = operand;
operand = ((RexCall) rex).getOperands().get(0);
}
}
list.add(rex);
}
return list;
}
/**
* The purpose of the replace() method is to allow the caller to replace a 'top' and 'bottom' project with
* a single merged project with the assumption that caller knows exactly the semantics/correctness of merging
* the two projects. This is not applying the full fledged DrillMergeProjectRule.
* @param topProject
* @param bottomProject
* @return new project after replacement
*/
public static Project replace(Project topProject, Project bottomProject) {
final List<RexNode> newProjects =
RelOptUtil.pushPastProject(topProject.getProjects(), bottomProject);
// replace the two projects with a combined projection
if (topProject instanceof DrillProjectRel) {
RelNode newProjectRel = DrillRelFactories.DRILL_LOGICAL_PROJECT_FACTORY.createProject(
bottomProject.getInput(), newProjects,
topProject.getRowType().getFieldNames());
return (Project) newProjectRel;
}
else {
RelNode newProjectRel = PrelFactories.PROJECT_FACTORY.createProject(
bottomProject.getInput(), newProjects,
topProject.getRowType().getFieldNames());
return (Project) newProjectRel;
}
}
}
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