/**
* 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.optimizer.ppr;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator;
import org.apache.hadoop.hive.ql.exec.ExprNodeEvaluatorFactory;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
public class PartExprEvalUtils {
/**
* Evaluate expression with partition columns
*
* @param expr
* @param partSpec
* @param rowObjectInspector
* @return value returned by the expression
* @throws HiveException
*/
static synchronized public Object evalExprWithPart(ExprNodeDesc expr, LinkedHashMap<String, String> partSpec,
StructObjectInspector rowObjectInspector) throws HiveException {
Object[] rowWithPart = new Object[2];
// Create the row object
ArrayList<String> partNames = new ArrayList<String>();
ArrayList<String> partValues = new ArrayList<String>();
ArrayList<ObjectInspector> partObjectInspectors = new ArrayList<ObjectInspector>();
for (Map.Entry<String, String> entry : partSpec.entrySet()) {
partNames.add(entry.getKey());
partValues.add(entry.getValue());
partObjectInspectors
.add(PrimitiveObjectInspectorFactory.javaStringObjectInspector);
}
StructObjectInspector partObjectInspector = ObjectInspectorFactory
.getStandardStructObjectInspector(partNames, partObjectInspectors);
rowWithPart[1] = partValues;
ArrayList<StructObjectInspector> ois = new ArrayList<StructObjectInspector>(
2);
ois.add(rowObjectInspector);
ois.add(partObjectInspector);
StructObjectInspector rowWithPartObjectInspector = ObjectInspectorFactory
.getUnionStructObjectInspector(ois);
ExprNodeEvaluator evaluator = ExprNodeEvaluatorFactory
.get(expr);
ObjectInspector evaluateResultOI = evaluator
.initialize(rowWithPartObjectInspector);
Object evaluateResultO = evaluator.evaluate(rowWithPart);
return ((PrimitiveObjectInspector) evaluateResultOI)
.getPrimitiveJavaObject(evaluateResultO);
}
static synchronized public Map<PrimitiveObjectInspector, ExprNodeEvaluator> prepareExpr(
ExprNodeDesc expr, List<String> partNames,
StructObjectInspector rowObjectInspector) throws HiveException {
// Create the row object
List<ObjectInspector> partObjectInspectors = new ArrayList<ObjectInspector>();
for (int i = 0; i < partNames.size(); i++) {
partObjectInspectors.add(PrimitiveObjectInspectorFactory.javaStringObjectInspector);
}
StructObjectInspector partObjectInspector = ObjectInspectorFactory
.getStandardStructObjectInspector(partNames, partObjectInspectors);
List<StructObjectInspector> ois = new ArrayList<StructObjectInspector>(2);
ois.add(rowObjectInspector);
ois.add(partObjectInspector);
StructObjectInspector rowWithPartObjectInspector =
ObjectInspectorFactory.getUnionStructObjectInspector(ois);
ExprNodeEvaluator evaluator = ExprNodeEvaluatorFactory.get(expr);
ObjectInspector evaluateResultOI = evaluator.initialize(rowWithPartObjectInspector);
Map<PrimitiveObjectInspector, ExprNodeEvaluator> result =
new HashMap<PrimitiveObjectInspector, ExprNodeEvaluator>();
result.put((PrimitiveObjectInspector)evaluateResultOI, evaluator);
return result;
}
static synchronized public Object evaluateExprOnPart(
Map<PrimitiveObjectInspector, ExprNodeEvaluator> pair, Object[] rowWithPart)
throws HiveException {
assert(pair.size() > 0);
// only get the 1st entry from the map
Map.Entry<PrimitiveObjectInspector, ExprNodeEvaluator> entry = pair.entrySet().iterator().next();
PrimitiveObjectInspector evaluateResultOI = entry.getKey();
ExprNodeEvaluator evaluator = entry.getValue();
Object evaluateResultO = evaluator.evaluate(rowWithPart);
return evaluateResultOI.getPrimitiveJavaObject(evaluateResultO);
}
}