/**
* 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.exec.vector.expressions;
import org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector;
import org.apache.hadoop.hive.ql.exec.vector.LongColumnVector;
import org.apache.hadoop.hive.ql.exec.vector.VectorExpressionDescriptor;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
import java.text.ParseException;
/**
* Abstract class to return various fields from a String.
*/
public abstract class VectorUDFTimestampFieldString extends VectorExpression {
private static final long serialVersionUID = 1L;
protected int colNum;
protected int outputColumn;
protected final int fieldStart;
protected final int fieldLength;
private static final String patternMin = "0000-00-00 00:00:00.000000000";
private static final String patternMax = "9999-19-99 29:59:59.999999999";
public VectorUDFTimestampFieldString(int colNum, int outputColumn, int fieldStart, int fieldLength) {
this.colNum = colNum;
this.outputColumn = outputColumn;
this.fieldStart = fieldStart;
this.fieldLength = fieldLength;
}
public VectorUDFTimestampFieldString() {
fieldStart = -1;
fieldLength = -1;
}
private long getField(byte[] bytes, int start, int length) throws ParseException {
// Validate
for (int i = 0; i < length; i++) {
char ch = (char) bytes[start + i];
if (ch < patternMin.charAt(i) || ch > patternMax.charAt(i)) {
throw new ParseException("A timestamp string should match 'yyyy-MM-dd HH:mm:ss.fffffffff' pattern.", i);
}
}
return doGetField(bytes, start, length);
}
protected long doGetField(byte[] bytes, int start, int length) throws ParseException {
int field = 0;
if (length < fieldLength) {
throw new ParseException("A timestamp string should be longer.", 0);
}
for (int i = fieldStart; i < fieldStart + fieldLength; i++) {
byte ch = bytes[start + i];
field = 10 * field + (ch - '0');
}
return field;
}
@Override
public void evaluate(VectorizedRowBatch batch) {
if (childExpressions != null) {
super.evaluateChildren(batch);
}
LongColumnVector outV = (LongColumnVector) batch.cols[outputColumn];
BytesColumnVector inputCol = (BytesColumnVector)batch.cols[this.colNum];
final int n = inputCol.isRepeating ? 1 : batch.size;
int[] sel = batch.selected;
final boolean selectedInUse = (inputCol.isRepeating == false) && batch.selectedInUse;
if (batch.size == 0) {
// n != batch.size when isRepeating
return;
}
// true for all algebraic UDFs with no state
outV.isRepeating = inputCol.isRepeating;
if (inputCol.noNulls) {
outV.noNulls = true;
if (selectedInUse) {
for (int j = 0; j < n; j++) {
int i = sel[j];
try {
outV.vector[i] = getField(inputCol.vector[i], inputCol.start[i], inputCol.length[i]);
outV.isNull[i] = false;
} catch (ParseException e) {
outV.noNulls = false;
outV.isNull[i] = true;
}
}
} else {
for (int i = 0; i < n; i++) {
try {
outV.vector[i] = getField(inputCol.vector[i], inputCol.start[i], inputCol.length[i]);
outV.isNull[i] = false;
} catch (ParseException e) {
outV.noNulls = false;
outV.isNull[i] = true;
}
}
}
} else {
// Handle case with nulls. Don't do function if the value is null, to save time,
// because calling the function can be expensive.
outV.noNulls = false;
if (selectedInUse) {
for (int j = 0; j < n; j++) {
int i = sel[j];
outV.isNull[i] = inputCol.isNull[i];
if (!inputCol.isNull[i]) {
try {
outV.vector[i] = getField(inputCol.vector[i], inputCol.start[i], inputCol.length[i]);
} catch (ParseException e) {
outV.isNull[i] = true;
}
}
}
} else {
for (int i = 0; i < n; i++) {
outV.isNull[i] = inputCol.isNull[i];
if (!inputCol.isNull[i]) {
try {
outV.vector[i] = getField(inputCol.vector[i], inputCol.start[i], inputCol.length[i]);
} catch (ParseException e) {
outV.isNull[i] = true;
}
}
}
}
}
}
@Override
public int getOutputColumn() {
return this.outputColumn;
}
@Override
public String getOutputType() {
return "long";
}
public int getColNum() {
return colNum;
}
public void setColNum(int colNum) {
this.colNum = colNum;
}
public void setOutputColumn(int outputColumn) {
this.outputColumn = outputColumn;
}
@Override
public String vectorExpressionParameters() {
if (fieldStart == -1) {
return "col " + colNum;
} else {
return "col " + colNum + ", fieldStart " + fieldStart + ", fieldLength " + fieldLength;
}
}
@Override
public VectorExpressionDescriptor.Descriptor getDescriptor() {
VectorExpressionDescriptor.Builder b = new VectorExpressionDescriptor.Builder();
b.setMode(VectorExpressionDescriptor.Mode.PROJECTION)
.setNumArguments(1)
.setArgumentTypes(
VectorExpressionDescriptor.ArgumentType.STRING_FAMILY)
.setInputExpressionTypes(
VectorExpressionDescriptor.InputExpressionType.COLUMN);
return b.build();
}
}