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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.exec.vector.expressions;
import java.io.UnsupportedEncodingException;
import org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector;
import org.apache.hadoop.hive.ql.exec.vector.VectorExpressionDescriptor;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
/**
* This class provides the implementation of vectorized substring, with a single start index
* parameter. If the start index is invalid (outside of the string boundaries) then an empty
* string will be in the output.
*/
public class StringSubstrColStart extends VectorExpression {
private static final long serialVersionUID = 1L;
private int startIdx;
private int colNum;
private int outputColumn;
private transient static byte[] EMPTY_STRING;
// Populating the Empty string bytes. Putting it as static since it should be immutable and can
// be shared.
static {
try {
EMPTY_STRING = "".getBytes("UTF-8");
} catch(UnsupportedEncodingException e) {
e.printStackTrace();
}
}
public StringSubstrColStart(int colNum, int startIdx, int outputColumn) {
this();
this.colNum = colNum;
/* Switch from a 1-based start offset (the Hive end user convention) to a 0-based start offset
* (the internal convention).
*/
if (startIdx >= 1) {
this.startIdx = startIdx - 1;
} else if (startIdx == 0) {
// If start index is 0 in query, that is equivalent to using 1 in query.
// So internal offset is 0.
this.startIdx = 0;
} else {
// start index of -n means give the last n characters of the string
this.startIdx = startIdx;
}
this.outputColumn = outputColumn;
}
public StringSubstrColStart() {
super();
}
/**
* Given the substring start index param it finds the starting offset of the passed in utf8
* string byte array that matches the index.
* @param utf8String byte array that holds the utf8 string
* @param start start offset of the byte array the string starts at
* @param len length of the bytes the string holds in the byte array
* @param substrStart the Start index for the substring operation
*/
static int getSubstrStartOffset(byte[] utf8String, int start, int len, int substrStart) {
int end = start + len;
if (substrStart < 0) {
int length = 0;
for (int i = start; i != end; ++i) {
if ((utf8String[i] & 0xc0) != 0x80) {
++length;
}
}
if (-substrStart > length) {
/* The result is empty string if a negative start is provided
* whose absolute value is greater than the string length.
*/
return -1;
}
substrStart = length + substrStart;
}
int curIdx = -1;
for (int i = start; i != end; ++i) {
if ((utf8String[i] & 0xc0) != 0x80) {
++curIdx;
if (curIdx == substrStart) {
return i;
}
}
}
return -1;
}
@Override
public void evaluate(VectorizedRowBatch batch) {
if (childExpressions != null) {
super.evaluateChildren(batch);
}
BytesColumnVector inV = (BytesColumnVector) batch.cols[colNum];
BytesColumnVector outV = (BytesColumnVector) batch.cols[outputColumn];
int n = batch.size;
if (n == 0) {
return;
}
byte[][] vector = inV.vector;
int[] sel = batch.selected;
int[] len = inV.length;
int[] start = inV.start;
outV.initBuffer();
if (inV.isRepeating) {
outV.isRepeating = true;
if (!inV.noNulls && inV.isNull[0]) {
outV.isNull[0] = true;
outV.noNulls = false;
outV.setVal(0, EMPTY_STRING, 0, EMPTY_STRING.length);
return;
} else {
outV.noNulls = true;
int offset = getSubstrStartOffset(vector[0], start[0], len[0], startIdx);
if (offset != -1) {
outV.setVal(0, vector[0], offset, len[0] - (offset - start[0]));
} else {
outV.setVal(0, EMPTY_STRING, 0, EMPTY_STRING.length);
}
}
} else {
outV.isRepeating = false;
if (batch.selectedInUse) {
if (!inV.noNulls) {
outV.noNulls = false;
for (int i = 0; i != n; ++i) {
int selected = sel[i];
if (!inV.isNull[selected]) {
int offset = getSubstrStartOffset(vector[selected], start[selected], len[selected],
startIdx);
outV.isNull[selected] = false;
if (offset != -1) {
outV.setVal(selected, vector[selected], offset,
len[selected] - (offset - start[selected]));
} else {
outV.setVal(selected, EMPTY_STRING, 0, EMPTY_STRING.length);
}
} else {
outV.isNull[selected] = true;
}
}
} else {
outV.noNulls = true;
for (int i = 0; i != n; ++i) {
int selected = sel[i];
int offset = getSubstrStartOffset(vector[selected], start[selected], len[selected],
startIdx);
if (offset != -1) {
outV.setVal(selected, vector[selected], offset,
len[selected] - (offset - start[selected]));
} else {
outV.setVal(selected, EMPTY_STRING, 0, EMPTY_STRING.length);
}
}
}
} else {
if (!inV.noNulls) {
outV.noNulls = false;
System.arraycopy(inV.isNull, 0, outV.isNull, 0, n);
for (int i = 0; i != n; ++i) {
if (!inV.isNull[i]) {
int offset = getSubstrStartOffset(vector[i], start[i], len[i], startIdx);
if (offset != -1) {
outV.setVal(i, vector[i], offset, len[i] - (offset - start[i]));
} else {
outV.setVal(i, EMPTY_STRING, 0, EMPTY_STRING.length);
}
}
}
} else {
outV.noNulls = true;
for (int i = 0; i != n; ++i) {
int offset = getSubstrStartOffset(vector[i], start[i], len[i], startIdx);
if (offset != -1) {
outV.setVal(i, vector[i], offset, len[i] - (offset - start[i]));
} else {
outV.setVal(i, EMPTY_STRING, 0, EMPTY_STRING.length);
}
}
}
}
}
}
@Override
public int getOutputColumn() {
return outputColumn;
}
@Override
public String getOutputType() {
return "string";
}
public int getStartIdx() {
return startIdx;
}
public void setStartIdx(int startIdx) {
this.startIdx = startIdx;
}
public int getColNum() {
return colNum;
}
public void setColNum(int colNum) {
this.colNum = colNum;
}
public void setOutputColumn(int outputColumn) {
this.outputColumn = outputColumn;
}
@Override
public VectorExpressionDescriptor.Descriptor getDescriptor() {
VectorExpressionDescriptor.Builder b = new VectorExpressionDescriptor.Builder();
b.setMode(VectorExpressionDescriptor.Mode.PROJECTION)
.setNumArguments(2)
.setArgumentTypes(
VectorExpressionDescriptor.ArgumentType.STRING,
VectorExpressionDescriptor.ArgumentType.LONG)
.setInputExpressionTypes(
VectorExpressionDescriptor.InputExpressionType.COLUMN,
VectorExpressionDescriptor.InputExpressionType.SCALAR);
return b.build();
}
}
