All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.apache.calcite.rex.RexLocalRef Maven / Gradle / Ivy

There is a newer version: 1.21.0.263
Show newest version
/*
 * 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 org.apache.calcite.rex;

import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.sql.SqlKind;

import java.util.List;
import java.util.Objects;

/**
 * Local variable.
 *
 * 

Identity is based upon type and index. We want multiple references to the * same slot in the same context to be equal. A side effect is that references * to slots in different contexts which happen to have the same index and type * will be considered equal; this is not desired, but not too damaging, because * of the immutability. * *

Variables are immutable. */ public class RexLocalRef extends RexSlot { //~ Static fields/initializers --------------------------------------------- // array of common names, to reduce memory allocations @SuppressWarnings("MismatchedQueryAndUpdateOfCollection") private static final List NAMES = new SelfPopulatingList("$t", 30); //~ Constructors ----------------------------------------------------------- /** * Creates a local variable. * * @param index Index of the field in the underlying row type * @param type Type of the column */ public RexLocalRef(int index, RelDataType type) { super(createName(index), index, type); assert type != null; assert index >= 0; } //~ Methods ---------------------------------------------------------------- @Override public SqlKind getKind() { return SqlKind.LOCAL_REF; } public boolean equals(Object obj) { return this == obj || obj instanceof RexLocalRef && this.type == ((RexLocalRef) obj).type && this.index == ((RexLocalRef) obj).index; } public int hashCode() { return Objects.hash(type, index); } public R accept(RexVisitor visitor) { return visitor.visitLocalRef(this); } public R accept(RexBiVisitor visitor, P arg) { return visitor.visitLocalRef(this, arg); } private static String createName(int index) { return NAMES.get(index); } } // End RexLocalRef.java





© 2015 - 2024 Weber Informatics LLC | Privacy Policy