com.hazelcast.jet.sql.impl.opt.logical.JoinLogicalRule Maven / Gradle / Ivy
/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.opt.logical;
import com.hazelcast.jet.sql.impl.opt.OptUtils;
import com.hazelcast.org.apache.calcite.plan.Convention;
import com.hazelcast.org.apache.calcite.plan.RelOptRule;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.convert.ConverterRule;
import com.hazelcast.org.apache.calcite.rel.core.JoinRelType;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalJoin;
import com.hazelcast.org.apache.calcite.rel.rules.JoinCommuteRule;
import static com.hazelcast.jet.sql.impl.opt.Conventions.LOGICAL;
final class JoinLogicalRule extends ConverterRule {
static final RelOptRule INSTANCE = new JoinLogicalRule();
private JoinLogicalRule() {
super(
LogicalJoin.class, Convention.NONE, LOGICAL,
JoinLogicalRule.class.getSimpleName()
);
}
@Override
public RelNode convert(RelNode rel) {
LogicalJoin join = (LogicalJoin) rel;
// We convert every RIGHT JOIN to LEFT JOIN to use already
// implemented LEFT JOIN operators.
if (join.getJoinType() == JoinRelType.RIGHT) {
return JoinCommuteRule.swap(join, true);
}
return new JoinLogicalRel(
join.getCluster(),
OptUtils.toLogicalConvention(join.getTraitSet()),
OptUtils.toLogicalInput(join.getLeft()),
OptUtils.toLogicalInput(join.getRight()),
join.getCondition(),
join.getJoinType()
);
}
}