/**
* 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.hadoop.hive.ql.optimizer.calcite;
import org.apache.calcite.linq4j.Ord;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.core.TableFunctionScan;
import org.apache.calcite.rel.core.TableScan;
import org.apache.calcite.rel.logical.LogicalAggregate;
import org.apache.calcite.rel.logical.LogicalCorrelate;
import org.apache.calcite.rel.logical.LogicalExchange;
import org.apache.calcite.rel.logical.LogicalFilter;
import org.apache.calcite.rel.logical.LogicalIntersect;
import org.apache.calcite.rel.logical.LogicalJoin;
import org.apache.calcite.rel.logical.LogicalMatch;
import org.apache.calcite.rel.logical.LogicalMinus;
import org.apache.calcite.rel.logical.LogicalProject;
import org.apache.calcite.rel.logical.LogicalSort;
import org.apache.calcite.rel.logical.LogicalUnion;
import org.apache.calcite.rel.logical.LogicalValues;
import org.apache.calcite.util.Stacks;
import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveAggregate;
import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveFilter;
import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveJoin;
import org.apache.hadoop.hive.ql.optimizer.calcite.reloperators.HiveProject;
import java.util.ArrayList;
import java.util.List;
public class HiveRelShuttleImpl implements HiveRelShuttle {
protected final List<RelNode> stack = new ArrayList<RelNode>();
/**
* Visits a particular child of a parent.
*/
protected RelNode visitChild(RelNode parent, int i, RelNode child) {
Stacks.push(stack, parent);
try {
RelNode child2 = child.accept(this);
if (child2 != child) {
final List<RelNode> newInputs =
new ArrayList<RelNode>(parent.getInputs());
newInputs.set(i, child2);
return parent.copy(parent.getTraitSet(), newInputs);
}
return parent;
} finally {
Stacks.pop(stack, parent);
}
}
protected RelNode visitChildren(RelNode rel) {
for (Ord<RelNode> input : Ord.zip(rel.getInputs())) {
rel = visitChild(rel, input.i, input.e);
}
return rel;
}
public RelNode visit(LogicalAggregate aggregate) {
return visitChild(aggregate, 0, aggregate.getInput());
}
public RelNode visit(HiveAggregate aggregate) {
return visitChild(aggregate, 0, aggregate.getInput());
}
public RelNode visit(TableScan scan) {
return scan;
}
public RelNode visit(TableFunctionScan scan) {
return visitChildren(scan);
}
public RelNode visit(LogicalValues values) {
return values;
}
public RelNode visit(HiveFilter filter) {
return visitChild(filter, 0, filter.getInput());
}
public RelNode visit(LogicalFilter filter) {
return visitChild(filter, 0, filter.getInput());
}
public RelNode visit(HiveProject project) {
return visitChild(project, 0, project.getInput());
}
public RelNode visit(LogicalProject project) {
return visitChild(project, 0, project.getInput());
}
public RelNode visit(LogicalJoin join) {
return visitChildren(join);
}
public RelNode visit(HiveJoin join) {
return visitChildren(join);
}
public RelNode visit(LogicalCorrelate correlate) {
return visitChildren(correlate);
}
public RelNode visit(LogicalUnion union) {
return visitChildren(union);
}
public RelNode visit(LogicalIntersect intersect) {
return visitChildren(intersect);
}
public RelNode visit(LogicalMinus minus) {
return visitChildren(minus);
}
public RelNode visit(LogicalSort sort) {
return visitChildren(sort);
}
public RelNode visit(LogicalExchange exchange) {
return visitChildren(exchange);
}
public RelNode visit(RelNode other) {
return visitChildren(other);
}
public RelNode visit(LogicalMatch match) {
return visitChildren(match);
}
}
// End RelShuttleImpl.java