com.hazelcast.org.apache.calcite.rel.metadata.RelColumnOrigin 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.metadata;
import com.hazelcast.org.apache.calcite.plan.RelOptTable;
/**
* RelColumnOrigin is a data structure describing one of the origins of an
* output column produced by a relational expression.
*/
public class RelColumnOrigin {
//~ Instance fields --------------------------------------------------------
private final RelOptTable originTable;
private final int iOriginColumn;
private final boolean isDerived;
//~ Constructors -----------------------------------------------------------
public RelColumnOrigin(
RelOptTable originTable,
int iOriginColumn,
boolean isDerived) {
this.originTable = originTable;
this.iOriginColumn = iOriginColumn;
this.isDerived = isDerived;
}
//~ Methods ----------------------------------------------------------------
/**
* @return table of origin
*/
public RelOptTable getOriginTable() {
return originTable;
}
/**
* @return 0-based index of column in origin table; whether this ordinal is
* flattened or unflattened depends on whether UDT flattening has already
* been performed on the relational expression which produced this
* description
*/
public int getOriginColumnOrdinal() {
return iOriginColumn;
}
/**
* Consider the query select a+b as c, d as e from t. The
* output column c has two origins (a and b), both of them derived. The
* output column d as one origin (c), which is not derived.
*
* @return false if value taken directly from column in origin table; true
* otherwise
*/
public boolean isDerived() {
return isDerived;
}
// override Object
public boolean equals(Object obj) {
if (!(obj instanceof RelColumnOrigin)) {
return false;
}
RelColumnOrigin other = (RelColumnOrigin) obj;
return originTable.getQualifiedName().equals(
other.originTable.getQualifiedName())
&& (iOriginColumn == other.iOriginColumn)
&& (isDerived == other.isDerived);
}
// override Object
public int hashCode() {
return originTable.getQualifiedName().hashCode()
+ iOriginColumn + (isDerived ? 313 : 0);
}
}