com.hazelcast.org.apache.calcite.rel.rules.FilterMultiJoinMergeRule Maven / Gradle / Ivy
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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 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
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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.rel.core.Filter;
import com.hazelcast.org.apache.calcite.rel.core.RelFactories;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalFilter;
import com.hazelcast.org.apache.calcite.rex.RexBuilder;
import com.hazelcast.org.apache.calcite.rex.RexNode;
import com.hazelcast.org.apache.calcite.rex.RexUtil;
import com.hazelcast.org.apache.calcite.tools.RelBuilderFactory;
import java.util.Arrays;
import java.util.List;
/**
* Planner rule that merges a
* {@link Filter} into a {@link MultiJoin},
* creating a richer {@code MultiJoin}.
*
* @see com.hazelcast.org.apache.calcite.rel.rules.ProjectMultiJoinMergeRule
*/
public class FilterMultiJoinMergeRule extends RelOptRule implements TransformationRule {
public static final FilterMultiJoinMergeRule INSTANCE =
new FilterMultiJoinMergeRule(RelFactories.LOGICAL_BUILDER);
//~ Constructors -----------------------------------------------------------
/**
* Creates a FilterMultiJoinMergeRule that uses {@link Filter}
* of type {@link LogicalFilter}
* @param relBuilderFactory builder factory for relational expressions
*/
public FilterMultiJoinMergeRule(RelBuilderFactory relBuilderFactory) {
this(LogicalFilter.class, relBuilderFactory);
}
/**
* Creates a FilterMultiJoinMergeRule that uses a generic
* {@link Filter}
* @param filterClass filter class
* @param relBuilderFactory builder factory for relational expressions
*/
public FilterMultiJoinMergeRule(Class filterClass,
RelBuilderFactory relBuilderFactory) {
super(
operand(filterClass,
operand(MultiJoin.class, any())),
relBuilderFactory, null);
}
//~ Methods ----------------------------------------------------------------
public void onMatch(RelOptRuleCall call) {
Filter filter = call.rel(0);
MultiJoin multiJoin = call.rel(1);
// Create a new post-join filter condition
// Conditions are nullable, so ImmutableList can't be used here
List filters = Arrays.asList(
filter.getCondition(),
multiJoin.getPostJoinFilter());
final RexBuilder rexBuilder = multiJoin.getCluster().getRexBuilder();
MultiJoin newMultiJoin =
new MultiJoin(
multiJoin.getCluster(),
multiJoin.getInputs(),
multiJoin.getJoinFilter(),
multiJoin.getRowType(),
multiJoin.isFullOuterJoin(),
multiJoin.getOuterJoinConditions(),
multiJoin.getJoinTypes(),
multiJoin.getProjFields(),
multiJoin.getJoinFieldRefCountsMap(),
RexUtil.com.hazelcast.com.oseConjunction(rexBuilder, filters, true));
call.transformTo(newMultiJoin);
}
}