org.apache.hadoop.hive.ql.exec.vector.expressions.VectorUDFMapIndexBaseScalar Maven / Gradle / Ivy
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* distributed with this work for additional information
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* 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,
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*/
package org.apache.hadoop.hive.ql.exec.vector.expressions;
import org.apache.hadoop.hive.ql.exec.vector.ColumnVector;
import org.apache.hadoop.hive.ql.exec.vector.MapColumnVector;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
import org.apache.hadoop.hive.ql.metadata.HiveException;
/**
* Superclass to support vectorized functions that take a scalar as key of Map
* and return the value of Map.
*/
public abstract class VectorUDFMapIndexBaseScalar extends VectorUDFMapIndexBase {
private static final long serialVersionUID = 1L;
private int mapColumnNum;
public VectorUDFMapIndexBaseScalar() {
super();
}
public VectorUDFMapIndexBaseScalar(int mapColumnNum, int outputColumnNum) {
super(outputColumnNum);
this.mapColumnNum = mapColumnNum;
}
@Override
public void evaluate(VectorizedRowBatch batch) throws HiveException {
if (childExpressions != null) {
super.evaluateChildren(batch);
}
ColumnVector outV = batch.cols[outputColumnNum];
MapColumnVector mapV = (MapColumnVector) batch.cols[mapColumnNum];
/*
* Do careful maintenance of the outputColVector.noNulls flag.
*/
int[] mapValueIndex;
if (mapV.isRepeating) {
if (mapV.isNull[0]) {
outV.isNull[0] = true;
outV.noNulls = false;
} else {
mapValueIndex = getMapValueIndex(mapV, batch);
if (mapValueIndex[0] == -1) {
// the key is not found in MapColumnVector, set the output as null ColumnVector
outV.isNull[0] = true;
outV.noNulls = false;
} else {
// the key is found in MapColumnVector, set the value
outV.setElement(0, (int) (mapV.offsets[0] + mapValueIndex[0]), mapV.values);
}
}
outV.isRepeating = true;
} else {
mapValueIndex = getMapValueIndex(mapV, batch);
for (int i = 0; i < batch.size; i++) {
int j = (batch.selectedInUse) ? batch.selected[i] : i;
if (mapV.isNull[j] || mapValueIndex[j] == -1) {
outV.isNull[j] = true;
outV.noNulls = false;
} else {
outV.isNull[j] = false;
outV.setElement(j, (int) (mapV.offsets[j] + mapValueIndex[j]), mapV.values);
}
}
outV.isRepeating = false;
}
}
public int getMapColumnNum() {
return mapColumnNum;
}
}