com.hazelcast.shaded.org.apache.calcite.rex.RexCopier 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.shaded.org.apache.calcite.rex;
import com.hazelcast.shaded.org.apache.calcite.rel.type.RelDataType;
/**
* Shuttle which creates a deep copy of a Rex expression.
*
* This is useful when copying objects from one type factory or builder to
* another.
*
* @see RexBuilder#copy(RexNode)
*/
class RexCopier extends RexShuttle {
//~ Instance fields --------------------------------------------------------
private final RexBuilder builder;
//~ Constructors -----------------------------------------------------------
/**
* Creates a RexCopier.
*
* @param builder Builder
*/
RexCopier(RexBuilder builder) {
this.builder = builder;
}
//~ Methods ----------------------------------------------------------------
private RelDataType copy(RelDataType type) {
return builder.getTypeFactory().copyType(type);
}
@Override public RexNode visitOver(RexOver over) {
final boolean[] update = null;
return new RexOver(copy(over.getType()), over.getAggOperator(),
visitList(over.getOperands(), update), visitWindow(over.getWindow()),
over.isDistinct(), over.ignoreNulls());
}
@Override public RexNode visitCall(final RexCall call) {
final boolean[] update = null;
return builder.makeCall(copy(call.getType()),
call.getOperator(),
visitList(call.getOperands(), update));
}
@Override public RexNode visitCorrelVariable(RexCorrelVariable variable) {
return builder.makeCorrel(copy(variable.getType()), variable.id);
}
@Override public RexNode visitFieldAccess(RexFieldAccess fieldAccess) {
return builder.makeFieldAccess(fieldAccess.getReferenceExpr().accept(this),
fieldAccess.getField().getIndex());
}
@Override public RexNode visitInputRef(RexInputRef inputRef) {
return builder.makeInputRef(copy(inputRef.getType()), inputRef.getIndex());
}
@Override public RexNode visitLocalRef(RexLocalRef localRef) {
return new RexLocalRef(localRef.getIndex(), copy(localRef.getType()));
}
@Override public RexNode visitLiteral(RexLiteral literal) {
// Get the value as is
return new RexLiteral(RexLiteral.value(literal), copy(literal.getType()),
literal.getTypeName());
}
@Override public RexNode visitDynamicParam(RexDynamicParam dynamicParam) {
return builder.makeDynamicParam(copy(dynamicParam.getType()),
dynamicParam.getIndex());
}
@Override public RexNode visitRangeRef(RexRangeRef rangeRef) {
return builder.makeRangeReference(copy(rangeRef.getType()),
rangeRef.getOffset(), false);
}
}