com.hazelcast.org.apache.calcite.rel.rules.FilterToCalcRule 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
* limitations under the License.
*/
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.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.RelFactories;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalCalc;
import com.hazelcast.org.apache.calcite.rel.logical.LogicalFilter;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rex.RexBuilder;
import com.hazelcast.org.apache.calcite.rex.RexProgram;
import com.hazelcast.org.apache.calcite.rex.RexProgramBuilder;
import com.hazelcast.org.apache.calcite.tools.RelBuilderFactory;
/**
* Planner rule that converts a
* {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalFilter} to a
* {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalCalc}.
*
* The rule does NOT fire if the child is a
* {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalFilter} or a
* {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalProject} (we assume they they
* will be converted using {@link FilterToCalcRule} or
* {@link ProjectToCalcRule}) or a
* {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalCalc}. This
* {@link com.hazelcast.org.apache.calcite.rel.logical.LogicalFilter} will eventually be
* converted by {@link FilterCalcMergeRule}.
*/
public class FilterToCalcRule extends RelOptRule implements TransformationRule {
//~ Static fields/initializers ---------------------------------------------
public static final FilterToCalcRule INSTANCE =
new FilterToCalcRule(RelFactories.LOGICAL_BUILDER);
//~ Constructors -----------------------------------------------------------
/**
* Creates a FilterToCalcRule.
*
* @param relBuilderFactory Builder for relational expressions
*/
public FilterToCalcRule(RelBuilderFactory relBuilderFactory) {
super(operand(LogicalFilter.class, any()), relBuilderFactory, null);
}
//~ Methods ----------------------------------------------------------------
public void onMatch(RelOptRuleCall call) {
final LogicalFilter filter = call.rel(0);
final RelNode rel = filter.getInput();
// Create a program containing a filter.
final RexBuilder rexBuilder = filter.getCluster().getRexBuilder();
final RelDataType inputRowType = rel.getRowType();
final RexProgramBuilder programBuilder =
new RexProgramBuilder(inputRowType, rexBuilder);
programBuilder.addIdentity();
programBuilder.addCondition(filter.getCondition());
final RexProgram program = programBuilder.getProgram();
final LogicalCalc calc = LogicalCalc.create(rel, program);
call.transformTo(calc);
}
}