/**
* 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 java.util.HashSet;
import java.util.List;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.rex.RexBuilder;
import org.apache.calcite.rex.RexExecutorImpl;
import org.apache.calcite.rex.RexNode;
import org.apache.hadoop.hive.ql.optimizer.ConstantPropagateProcFactory;
import org.apache.hadoop.hive.ql.optimizer.calcite.translator.ExprNodeConverter;
import org.apache.hadoop.hive.ql.optimizer.calcite.translator.RexNodeConverter;
import org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class HiveRexExecutorImpl extends RexExecutorImpl {
private static final Logger LOG = LoggerFactory.getLogger(HiveRexExecutorImpl.class);
private final RelOptCluster cluster;
public HiveRexExecutorImpl(RelOptCluster cluster) {
super(null);
this.cluster = cluster;
}
@Override
public void reduce(RexBuilder rexBuilder, List<RexNode> constExps, List<RexNode> reducedValues) {
RexNodeConverter rexNodeConverter = new RexNodeConverter(cluster);
for (RexNode rexNode : constExps) {
// initialize the converter
ExprNodeConverter converter = new ExprNodeConverter("", null, null, null,
new HashSet<Integer>(), cluster.getTypeFactory());
// convert RexNode to ExprNodeGenericFuncDesc
ExprNodeDesc expr = rexNode.accept(converter);
if (expr instanceof ExprNodeGenericFuncDesc) {
// folding the constant
ExprNodeDesc constant = ConstantPropagateProcFactory
.foldExpr((ExprNodeGenericFuncDesc) expr);
if (constant != null) {
try {
// convert constant back to RexNode
reducedValues.add(rexNodeConverter.convert((ExprNodeConstantDesc) constant));
} catch (Exception e) {
LOG.warn(e.getMessage());
reducedValues.add(rexNode);
}
} else {
reducedValues.add(rexNode);
}
} else {
reducedValues.add(rexNode);
}
}
}
}