com.hazelcast.org.apache.calcite.rel.rules.JoinExtractFilterRule Maven / Gradle / Ivy
/*
* 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
* limitations under the License.
*/
package com.hazelcast.org.apache.calcite.rel.rules;
import com.hazelcast.org.apache.calcite.rel.core.Join;
import com.hazelcast.org.apache.calcite.rel.core.RelFactories;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalJoin;
import com.hazelcast.org.apache.calcite.tools.RelBuilderFactory;
/**
* Rule to convert an
* {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalJoin inner join} to a
* {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalFilter filter} on top of a
* {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalJoin cartesian inner join}.
*
* One benefit of this transformation is that after it, the join condition
* can be com.hazelcast.com.ined with conditions and expressions above the join. It also makes
* the FennelCartesianJoinRule applicable.
*
*
The constructor is parameterized to allow any sub-class of
* {@link com.hazelcast.org.apache.calcite.rel.core.Join}, not just
* {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalJoin}.
*/
public final class JoinExtractFilterRule extends AbstractJoinExtractFilterRule {
//~ Static fields/initializers ---------------------------------------------
/** The singleton. */
public static final JoinExtractFilterRule INSTANCE =
new JoinExtractFilterRule(LogicalJoin.class,
RelFactories.LOGICAL_BUILDER);
//~ Constructors -----------------------------------------------------------
/**
* Creates a JoinExtractFilterRule.
*/
public JoinExtractFilterRule(Class clazz,
RelBuilderFactory relBuilderFactory) {
super(operand(clazz, any()), relBuilderFactory, null);
}
//~ Methods ----------------------------------------------------------------
}