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IDriver.java
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IDriver.java
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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 org.apache.hadoop.hive.ql;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.hive.common.classification.InterfaceAudience;
import org.apache.hadoop.hive.common.classification.InterfaceStability;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.api.Schema;
import org.apache.hadoop.hive.ql.exec.FetchTask;
import org.apache.hadoop.hive.ql.processors.CommandProcessor;
import org.apache.hadoop.hive.ql.processors.CommandProcessorException;
import org.apache.hadoop.hive.ql.processors.CommandProcessorResponse;
/**
* Hive query executor driver.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public interface IDriver extends CommandProcessor {
CommandProcessorResponse compileAndRespond(String statement) throws CommandProcessorException;
QueryPlan getPlan();
QueryState getQueryState();
QueryDisplay getQueryDisplay();
void setOperationId(String operationId);
CommandProcessorResponse run() throws CommandProcessorException;
@Override
CommandProcessorResponse run(String command) throws CommandProcessorException;
// create some "cover" to the result?
@SuppressWarnings("rawtypes")
boolean getResults(List res) throws IOException;
void setMaxRows(int maxRows);
FetchTask getFetchTask();
Schema getSchema();
boolean isFetchingTable();
void resetFetch() throws IOException;
// close&destroy is used in seq coupling most of the time - the difference is either not clear; or not relevant
// remove?
@Override
void close();
void destroy();
HiveConf getConf();
Context getContext();
boolean hasResultSet();
}