org.apache.hadoop.hive.ql.parse.ColumnAccessAnalyzer Maven / Gradle / Ivy
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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.parse;
import java.util.List;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.TableScanOperator;
import org.apache.hadoop.hive.ql.metadata.Table;
public class ColumnAccessAnalyzer {
private static final Log LOG = LogFactory.getLog(ColumnAccessAnalyzer.class.getName());
private final ParseContext pGraphContext;
public ColumnAccessAnalyzer() {
pGraphContext = null;
}
public ColumnAccessAnalyzer(ParseContext pactx) {
pGraphContext = pactx;
}
public ColumnAccessInfo analyzeColumnAccess() throws SemanticException {
ColumnAccessInfo columnAccessInfo = new ColumnAccessInfo();
Map topOps = pGraphContext.getTopToTable();
for (TableScanOperator op : topOps.keySet()) {
Table table = topOps.get(op);
String tableName = table.getCompleteName();
List referenced = op.getReferencedColumns();
for (String column : referenced) {
columnAccessInfo.add(tableName, column);
}
if (table.isPartitioned()) {
PrunedPartitionList parts = pGraphContext.getPrunedPartitions(table.getTableName(), op);
if (parts.getReferredPartCols() != null) {
for (String partKey : parts.getReferredPartCols()) {
columnAccessInfo.add(tableName, partKey);
}
}
}
}
return columnAccessInfo;
}
}