/**
* 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;
public class StringTrim extends StringUnaryUDFDirect {
private static final long serialVersionUID = 1L;
public StringTrim(int inputColumn, int outputColumn) {
super(inputColumn, outputColumn);
}
public StringTrim() {
super();
}
/**
* TRIM element i of the vector, eliminating blanks from the left
* and right sides of the string, and place the result in outV.
* Operate on the data in place, and set the output by reference
* to improve performance. Ignore null handling. That will be handled separately.
*/
protected void func(BytesColumnVector outV, byte[][] vector, int[] start, int[] length, int i) {
int l = start[i];
int r = start[i] + length[i] - 1;
// skip blank character on left
while(l <= r && vector[i][l] == 0x20) {
l++;
}
// skip blank characters on right
while(l <= r && vector[i][r] == 0x20) {
r--;
}
outV.setVal(i, vector[i], l, (r - l) + 1);
}
}