spark CharVarcharCodegenUtils 源码
spark CharVarcharCodegenUtils 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/util/CharVarcharCodegenUtils.java
/*
* 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.spark.sql.catalyst.util;
import org.apache.spark.unsafe.types.UTF8String;
public class CharVarcharCodegenUtils {
private static final UTF8String SPACE = UTF8String.fromString(" ");
private static UTF8String trimTrailingSpaces(
UTF8String inputStr, int numChars, int limit) {
int numTailSpacesToTrim = numChars - limit;
UTF8String trimmed = inputStr.trimTrailingSpaces(numTailSpacesToTrim);
if (trimmed.numChars() > limit) {
throw new RuntimeException("Exceeds char/varchar type length limitation: " + limit);
} else {
return trimmed;
}
}
public static UTF8String charTypeWriteSideCheck(UTF8String inputStr, int limit) {
int numChars = inputStr.numChars();
if (numChars == limit) {
return inputStr;
} else if (numChars < limit) {
return inputStr.rpad(limit, SPACE);
} else {
return trimTrailingSpaces(inputStr, numChars, limit);
}
}
public static UTF8String varcharTypeWriteSideCheck(UTF8String inputStr, int limit) {
int numChars = inputStr.numChars();
if (numChars <= limit) {
return inputStr;
} else {
return trimTrailingSpaces(inputStr, numChars, limit);
}
}
public static UTF8String readSidePadding(UTF8String inputStr, int limit) {
int numChars = inputStr.numChars();
if (numChars == limit) {
return inputStr;
} else if (numChars < limit) {
return inputStr.rpad(limit, SPACE);
} else {
return inputStr;
}
}
}
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