/**
* 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.parse;
import java.io.Serializable;
import java.util.List;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.ql.exec.ExplainSQRewriteTask;
import org.apache.hadoop.hive.ql.exec.Task;
import org.apache.hadoop.hive.ql.exec.TaskFactory;
import org.apache.hadoop.hive.ql.plan.ExplainSQRewriteWork;
public class ExplainSQRewriteSemanticAnalyzer extends BaseSemanticAnalyzer {
List<FieldSchema> fieldList;
public ExplainSQRewriteSemanticAnalyzer(HiveConf conf) throws SemanticException {
super(conf);
}
@SuppressWarnings("unchecked")
@Override
public void analyzeInternal(ASTNode ast) throws SemanticException {
ctx.setExplain(true);
// Create a semantic analyzer for the query
ASTNode input = (ASTNode) ast.getChild(0);
SemanticAnalyzer sem = (SemanticAnalyzer)
SemanticAnalyzerFactory.get(conf, input);
sem.analyze(input, ctx);
sem.validate();
ctx.setResFile(ctx.getLocalTmpPath());
ExplainSQRewriteWork work = new ExplainSQRewriteWork(ctx.getResFile().toString(),
sem.getQB(),
input,
ctx
);
ExplainSQRewriteTask explTask = (ExplainSQRewriteTask) TaskFactory.get(work, conf);
fieldList = explTask.getResultSchema();
rootTasks.add(explTask);
}
@Override
public List<FieldSchema> getResultSchema() {
return fieldList;
}
}