org.apache.hadoop.hive.ql.session.LineageState 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.session;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.ql.exec.ColumnInfo;
import org.apache.hadoop.hive.ql.exec.FileSinkOperator;
import org.apache.hadoop.hive.ql.exec.Operator;
import org.apache.hadoop.hive.ql.hooks.LineageInfo;
import org.apache.hadoop.hive.ql.hooks.LineageInfo.DataContainer;
import org.apache.hadoop.hive.ql.optimizer.lineage.LineageCtx.Index;
/**
* LineageState. Contains all the information used to generate the
* lineage information for the post execution hooks.
*
*/
public class LineageState {
/**
* Mapping from the directory name to FileSinkOperator (may not be FileSinkOperator for views). This
* mapping is generated at the filesink operator creation
* time and is then later used to created the mapping from
* movetask to the set of filesink operators.
*/
private final Map dirToFop;
/**
* The lineage context index for this query.
*/
private Index index;
/**
* The lineage info structure that is used to pass the lineage
* information to the hooks.
*/
private final LineageInfo linfo;
/**
* Constructor.
*/
public LineageState() {
dirToFop = new HashMap();
linfo = new LineageInfo();
index = new Index();
}
/**
* Adds a mapping from the load work to the file sink operator.
*
* @param dir The directory name.
* @param fop The sink operator.
*/
public void mapDirToOp(Path dir, Operator fop) {
dirToFop.put(dir, fop);
}
/**
* Set the lineage information for the associated directory.
*
* @param dir The directory containing the query results.
* @param dc The associated data container.
* @param cols The list of columns.
*/
public void setLineage(Path dir, DataContainer dc,
List cols) {
// First lookup the file sink operator from the load work.
Operator op = dirToFop.get(dir);
// Go over the associated fields and look up the dependencies
// by position in the row schema of the filesink operator.
if (op == null) {
return;
}
List signature = op.getSchema().getSignature();
int i = 0;
for (FieldSchema fs : cols) {
linfo.putDependency(dc, fs, index.getDependency(op, signature.get(i++)));
}
}
/**
* Gets the lineage information.
*
* @return LineageInfo.
*/
public LineageInfo getLineageInfo() {
return linfo;
}
/**
* Gets the index for the lineage state.
*
* @return Index.
*/
public Index getIndex() {
return index;
}
/**
* Clear all lineage states
*/
public void clear() {
dirToFop.clear();
linfo.clear();
index.clear();
}
}