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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 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.plan.RelOptTable;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.sql.SqlKind;

import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;

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

/**
 * Variable which references a column of a table occurrence in a relational plan.
 *
 * 

This object is used by * {@link com.hazelcast.org.apache.calcite.rel.metadata.BuiltInMetadata.ExpressionLineage} * and {@link com.hazelcast.org.apache.calcite.rel.metadata.BuiltInMetadata.AllPredicates}. * *

Given a relational expression, its purpose is to be able to reference uniquely * the provenance of a given expression. For that, it uses a unique table reference * (contained in a {@link RelTableRef}) and an column index within the table. * *

For example, {@code A.#0.$3 + 2} column {@code $3} in the {@code 0} * occurrence of table {@code A} in the plan. * *

Note that this kind of {@link RexNode} is an auxiliary data structure with * a very specific purpose and should not be used in relational expressions. */ public class RexTableInputRef extends RexInputRef { private final RelTableRef tableRef; private RexTableInputRef(RelTableRef tableRef, int index, RelDataType type) { super(index, type); this.tableRef = tableRef; this.digest = tableRef.toString() + ".$" + index; } //~ Methods ---------------------------------------------------------------- @Override public boolean equals(@Nullable Object obj) { return this == obj || obj instanceof RexTableInputRef && tableRef.equals(((RexTableInputRef) obj).tableRef) && index == ((RexTableInputRef) obj).index; } @Override public int hashCode() { return Objects.hashCode(digest); } public RelTableRef getTableRef() { return tableRef; } public List getQualifiedName() { return tableRef.getQualifiedName(); } public int getIdentifier() { return tableRef.getEntityNumber(); } public static RexTableInputRef of(RelTableRef tableRef, int index, RelDataType type) { return new RexTableInputRef(tableRef, index, type); } public static RexTableInputRef of(RelTableRef tableRef, RexInputRef ref) { return new RexTableInputRef(tableRef, ref.getIndex(), ref.getType()); } @Override public R accept(RexVisitor visitor) { return visitor.visitTableInputRef(this); } @Override public R accept(RexBiVisitor visitor, P arg) { return visitor.visitTableInputRef(this, arg); } @Override public SqlKind getKind() { return SqlKind.TABLE_INPUT_REF; } /** Identifies uniquely a table by its qualified name and its entity number * (occurrence). */ public static class RelTableRef implements Comparable { private final RelOptTable table; private final int entityNumber; private final String digest; private RelTableRef(RelOptTable table, int entityNumber) { this.table = table; this.entityNumber = entityNumber; this.digest = table.getQualifiedName() + ".#" + entityNumber; } //~ Methods ---------------------------------------------------------------- @Override public boolean equals(@Nullable Object obj) { return this == obj || obj instanceof RelTableRef && table.getQualifiedName().equals(((RelTableRef) obj).getQualifiedName()) && entityNumber == ((RelTableRef) obj).entityNumber; } @Override public int hashCode() { return digest.hashCode(); } public RelOptTable getTable() { return table; } public List getQualifiedName() { return table.getQualifiedName(); } public int getEntityNumber() { return entityNumber; } @Override public String toString() { return digest; } public static RelTableRef of(RelOptTable table, int entityNumber) { return new RelTableRef(table, entityNumber); } @Override public int compareTo(RelTableRef o) { return digest.compareTo(o.digest); } } }





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