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...n/java/org/apache/flink/table/planner/plan/rules/logical/SimplifyFilterConditionRule.java
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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. | ||
| */ | ||
|
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| package org.apache.flink.table.planner.plan.rules.logical; | ||
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| import org.apache.flink.table.planner.plan.utils.FlinkRexUtil; | ||
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| import org.apache.calcite.plan.RelOptRuleCall; | ||
| import org.apache.calcite.plan.RelRule; | ||
| import org.apache.calcite.rel.RelNode; | ||
| import org.apache.calcite.rel.RelShuttleImpl; | ||
| import org.apache.calcite.rel.core.Filter; | ||
| import org.apache.calcite.rel.logical.LogicalFilter; | ||
| import org.apache.calcite.rex.RexBuilder; | ||
| import org.apache.calcite.rex.RexNode; | ||
| import org.apache.calcite.rex.RexShuttle; | ||
| import org.apache.calcite.rex.RexSubQuery; | ||
| import org.apache.calcite.rex.RexUtil; | ||
| import org.immutables.value.Value; | ||
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| import java.util.Optional; | ||
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| /** | ||
| * Planner rule that apply various simplifying transformations on filter condition. | ||
| * | ||
| * <p>if `simplifySubQuery` is true, this rule will also simplify the filter condition in | ||
| * [[RexSubQuery]]. | ||
| */ | ||
| @Value.Enclosing | ||
| public class SimplifyFilterConditionRule | ||
| extends RelRule<SimplifyFilterConditionRule.SimplifyFilterConditionRuleConfig> { | ||
| /** | ||
| * Creates a RelRule. | ||
| * | ||
| * @param config | ||
| */ | ||
| protected SimplifyFilterConditionRule(SimplifyFilterConditionRuleConfig config) { | ||
| super(config); | ||
| } | ||
| /* | ||
| ( | ||
| simplifySubQuery: Boolean, description: String) | ||
| extends RelOptRule(operand(classOf[Filter], any()), description) { | ||
| */ | ||
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| public void onMatch(RelOptRuleCall call) { | ||
| Filter filter = call.rel(0); | ||
| boolean[] changed = new boolean[] {false}; | ||
| Optional<Filter> newFilter = simplify(filter, changed); | ||
| if (newFilter.isPresent()) { | ||
| call.transformTo(newFilter.get()); | ||
| call.getPlanner().prune(filter); | ||
| } | ||
| } | ||
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| public Optional<Filter> simplify(Filter filter, boolean[] changed) { | ||
| RexNode condition = | ||
| // config.isSimplifySubQuery | ||
| simplifyFilterConditionInSubQuery(filter.getCondition(), changed); | ||
| // : filter.getCondition(); | ||
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| RexBuilder rexBuilder = filter.getCluster().getRexBuilder(); | ||
| RexNode simplifiedCondition = | ||
| FlinkRexUtil.simplify( | ||
| rexBuilder, condition, filter.getCluster().getPlanner().getExecutor()); | ||
| RexNode newCondition = RexUtil.pullFactors(rexBuilder, simplifiedCondition); | ||
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| if (!changed[0] && !condition.equals(newCondition)) { | ||
| changed[0] = true; | ||
| } | ||
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| // just replace modified RexNode | ||
| return changed[0] | ||
| ? Optional.of(filter.copy(filter.getTraitSet(), filter.getInput(), newCondition)) | ||
| : Optional.empty(); | ||
| } | ||
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| private RexNode simplifyFilterConditionInSubQuery(RexNode condition, boolean[] changed) { | ||
| return condition.accept( | ||
| new RexShuttle() { | ||
| public RexNode visitSubQuery(RexSubQuery subQuery) { | ||
| RelNode newRel = | ||
| subQuery.rel.accept( | ||
| new RelShuttleImpl() { | ||
| public RelNode visit(LogicalFilter filter) { | ||
| return simplify(filter, changed).orElse(filter); | ||
| } | ||
| }); | ||
| if (changed[0]) { | ||
| return subQuery.clone(newRel); | ||
| } else { | ||
| return subQuery; | ||
| } | ||
| } | ||
| }); | ||
| } | ||
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| /** Rule configuration. */ | ||
| @Value.Immutable(singleton = false) | ||
| @Value.Style( | ||
| get = {"is*", "get*"}, | ||
| init = "with*", | ||
| defaults = @Value.Immutable(copy = false)) | ||
| public interface SimplifyFilterConditionRuleConfig extends RelRule.Config { | ||
| SimplifyFilterConditionRuleConfig DEFAULT = | ||
| ImmutableSimplifyFilterConditionRule.SimplifyFilterConditionRuleConfig.builder() | ||
| .build() | ||
| .withOperandSupplier(b0 -> b0.operand(Filter.class).anyInputs()) | ||
| .withDescription("SimplifyFilterConditionRule"); | ||
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| @Value.Default | ||
| default boolean isSimplifySubQuery() { | ||
| return false; | ||
| } | ||
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| /** Sets {@link #isSimplifySubQuery()}. */ | ||
| SimplifyFilterConditionRuleConfig withIsSimplifySubQuery(boolean simplifySubQuery); | ||
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| @Override | ||
| default SimplifyFilterConditionRule toRule() { | ||
| return new SimplifyFilterConditionRule(this); | ||
| } | ||
| } | ||
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| /** Holder for SimplifyFilterConditionRule. */ | ||
| public static class SimplifyFilterConditionRuleHolder { | ||
| public static final SimplifyFilterConditionRule INSTANCE = | ||
| SimplifyFilterConditionRule.SimplifyFilterConditionRuleConfig.DEFAULT.toRule(); | ||
| public static final SimplifyFilterConditionRule EXTENDED = | ||
| SimplifyFilterConditionRule.SimplifyFilterConditionRuleConfig.DEFAULT | ||
| .withDescription("SimplifyFilterConditionRule:simplifySubQuery") | ||
| .as(SimplifyFilterConditionRule.SimplifyFilterConditionRuleConfig.class) | ||
| .withIsSimplifySubQuery(true) | ||
| .toRule(); | ||
| } | ||
| } |
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...scala/org/apache/flink/table/planner/plan/rules/logical/SimplifyFilterConditionRule.scala
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