com.hazelcast.org.apache.calcite.rex.RexPermutationShuttle 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 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.
*/
package com.hazelcast.org.apache.calcite.rex;
import com.hazelcast.org.apache.calcite.util.Permutation;
/**
* Visitor which replaces {@link RexLocalRef} objects after the expressions in a
* {@link RexProgram} have been reordered.
*
* @see RexPermuteInputsShuttle
*/
public class RexPermutationShuttle extends RexShuttle {
//~ Instance fields --------------------------------------------------------
private final Permutation permutation;
//~ Constructors -----------------------------------------------------------
public RexPermutationShuttle(Permutation permutation) {
this.permutation = permutation;
}
//~ Methods ----------------------------------------------------------------
@Override public RexNode visitLocalRef(RexLocalRef local) {
final int index = local.getIndex();
int target = permutation.getTarget(index);
return new RexLocalRef(
target,
local.getType());
}
}