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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 com.hazelcast.org.apache.calcite.rel.rules;

import com.hazelcast.org.apache.calcite.plan.RelOptRuleCall;
import com.hazelcast.org.apache.calcite.plan.RelRule;
import com.hazelcast.org.apache.calcite.rel.core.Calc;
import com.hazelcast.org.apache.calcite.rex.RexOver;
import com.hazelcast.org.apache.calcite.rex.RexProgram;
import com.hazelcast.org.apache.calcite.rex.RexProgramBuilder;
import com.hazelcast.org.apache.calcite.tools.RelBuilderFactory;

import org.immutables.value.Value;

/**
 * Planner rule that merges a
 * {@link com.hazelcast.org.apache.calcite.rel.core.Calc} onto a
 * {@link com.hazelcast.org.apache.calcite.rel.core.Calc}.
 *
 * 

The resulting {@link com.hazelcast.org.apache.calcite.rel.core.Calc} has the * same project list as the upper * {@link com.hazelcast.org.apache.calcite.rel.core.Calc}, but expressed in terms of * the lower {@link com.hazelcast.org.apache.calcite.rel.core.Calc}'s inputs. * * @see CoreRules#CALC_MERGE */ @Value.Enclosing public class CalcMergeRule extends RelRule implements TransformationRule { /** Creates a CalcMergeRule. */ protected CalcMergeRule(Config config) { super(config); } @Deprecated // to be removed before 2.0 public CalcMergeRule(RelBuilderFactory relBuilderFactory) { this(Config.DEFAULT.withRelBuilderFactory(relBuilderFactory) .as(Config.class)); } //~ Methods ---------------------------------------------------------------- @Override public void onMatch(RelOptRuleCall call) { final Calc topCalc = call.rel(0); final Calc bottomCalc = call.rel(1); // Don't merge a calc which contains windowed aggregates onto a // calc. That would effectively be pushing a windowed aggregate down // through a filter. RexProgram topProgram = topCalc.getProgram(); if (RexOver.containsOver(topProgram)) { return; } // Merge the programs together. RexProgram mergedProgram = RexProgramBuilder.mergePrograms( topCalc.getProgram(), bottomCalc.getProgram(), topCalc.getCluster().getRexBuilder()); assert mergedProgram.getOutputRowType() == topProgram.getOutputRowType(); final Calc newCalc = topCalc.copy( topCalc.getTraitSet(), bottomCalc.getInput(), mergedProgram); if (newCalc.getDigest().equals(bottomCalc.getDigest()) && newCalc.getRowType().equals(bottomCalc.getRowType())) { // newCalc is equivalent to bottomCalc, which means that topCalc // must be trivial. Take it out of the game. call.getPlanner().prune(topCalc); } call.transformTo(newCalc); } /** Rule configuration. */ @Value.Immutable public interface Config extends RelRule.Config { Config DEFAULT = ImmutableCalcMergeRule.Config.of() .withOperandSupplier(b0 -> b0.operand(Calc.class).oneInput(b1 -> b1.operand(Calc.class).anyInputs())) .as(Config.class); @Override default CalcMergeRule toRule() { return new CalcMergeRule(this); } } }





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