/tags/release-0.0.0-rc0/hive/external/ql/src/java/org/apache/hadoop/hive/ql/exec/LimitOperator.java
Java | 64 lines | 34 code | 10 blank | 20 comment | 2 complexity | 231c65312656aab9bf59cbace9c1936f MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
- /**
- * 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.exec;
- import java.io.Serializable;
- import org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.hive.ql.metadata.HiveException;
- import org.apache.hadoop.hive.ql.plan.LimitDesc;
- import org.apache.hadoop.hive.ql.plan.api.OperatorType;
- /**
- * Limit operator implementation Limits the number of rows to be passed on.
- **/
- public class LimitOperator extends Operator<LimitDesc> implements Serializable {
- private static final long serialVersionUID = 1L;
- protected transient int limit;
- protected transient int currCount;
- @Override
- protected void initializeOp(Configuration hconf) throws HiveException {
- super.initializeOp(hconf);
- limit = conf.getLimit();
- currCount = 0;
- }
- @Override
- public void processOp(Object row, int tag) throws HiveException {
- if (currCount < limit) {
- forward(row, inputObjInspectors[tag]);
- currCount++;
- } else {
- setDone(true);
- }
- }
- @Override
- public String getName() {
- return "LIM";
- }
- @Override
- public OperatorType getType() {
- return OperatorType.LIMIT;
- }
- }