/**
* 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.optiq.rules;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.optimizer.optiq.RelOptHiveTable;
import org.apache.hadoop.hive.ql.optimizer.optiq.reloperators.HiveFilterRel;
import org.apache.hadoop.hive.ql.optimizer.optiq.reloperators.HiveTableScanRel;
import org.eigenbase.rel.FilterRelBase;
import org.eigenbase.relopt.RelOptRule;
import org.eigenbase.relopt.RelOptRuleCall;
import org.eigenbase.rex.RexNode;
import org.eigenbase.util.Pair;
public class HivePartitionPrunerRule extends RelOptRule {
HiveConf conf;
public HivePartitionPrunerRule(HiveConf conf) {
super(operand(HiveFilterRel.class, operand(HiveTableScanRel.class, none())));
this.conf = conf;
}
@Override
public void onMatch(RelOptRuleCall call) {
HiveFilterRel filter = call.rel(0);
HiveTableScanRel tScan = call.rel(1);
perform(call, filter, tScan);
}
protected void perform(RelOptRuleCall call, FilterRelBase filter,
HiveTableScanRel tScan) {
RelOptHiveTable hiveTable = (RelOptHiveTable) tScan.getTable();
RexNode predicate = filter.getCondition();
Pair<RexNode, RexNode> predicates = PartitionPruner
.extractPartitionPredicates(filter.getCluster(), hiveTable, predicate);
RexNode partColExpr = predicates.left;
hiveTable.computePartitionList(conf, partColExpr);
}
}