Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5303#discussion_r27539235
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/UTF8String.scala ---
@@ -0,0 +1,164 @@
+/*
+* 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.types
+
+/**
+ * A UTF-8 String used only in SparkSQL
+ */
+
+private[sql] final class UTF8String extends Ordered[UTF8String] with
Serializable {
+ private var bytes: Array[Byte] = _
+
+ def set(str: String): UTF8String = {
+ bytes = str.getBytes("utf-8")
+ this
+ }
+
+ def set(bytes: Array[Byte]): UTF8String = {
+ this.bytes = bytes.clone()
+ this
+ }
+
+ def length(): Int = {
+ var len = 0
+ var i: Int = 0
+ while (i < bytes.length) {
+ val b = bytes(i)
+ i += 1
+ if (b >= 196) {
+ i += UTF8String.bytesFromUTF8(b - 196)
+ }
+ len += 1
+ }
+ len
+ }
+
+ def getBytes: Array[Byte] = {
+ bytes
+ }
+
+ def slice(start: Int, end: Int): UTF8String = {
+ if (end <= start || start >= bytes.length || bytes == null) {
+ new UTF8String
+ }
+
+ var c = 0
+ var i: Int = 0
+ while (c < start && i < bytes.length) {
+ val b = bytes(i)
+ i += 1
+ if (b >= 196) {
+ i += UTF8String.bytesFromUTF8(b - 196)
+ }
+ c += 1
+ }
+ val bstart = i
+ while (c < end && i < bytes.length) {
+ val b = bytes(i)
+ i += 1
+ if (b >= 196) {
+ i += UTF8String.bytesFromUTF8(b - 196)
+ }
+ c += 1
+ }
+ UTF8String(java.util.Arrays.copyOfRange(bytes, bstart, i))
+ }
+
+ def contains(sub: UTF8String): Boolean = {
+ bytes.containsSlice(sub.bytes)
+ }
+
+ def startsWith(prefix: UTF8String): Boolean = {
+ bytes.startsWith(prefix.bytes)
+ }
+
+ def endsWith(suffix: UTF8String): Boolean = {
+ bytes.endsWith(suffix.bytes)
+ }
+
+ def toUpperCase(): UTF8String = {
+ UTF8String(toString().toUpperCase)
+ }
+
+ def toLowerCase(): UTF8String = {
+ UTF8String(toString().toLowerCase)
+ }
+
+ override def toString(): String = {
+ new String(bytes, "utf-8")
+ }
+
+ override def clone(): UTF8String = new UTF8String().set(this.bytes)
+
+ override def compare(other: UTF8String): Int = {
+ var i: Int = 0
+ while (i < bytes.length && i < other.bytes.length) {
+ val res = bytes(i).compareTo(other.bytes(i))
+ if (res != 0) return res
+ i += 1
+ }
+ bytes.length - other.bytes.length
+ }
+
+ override def compareTo(other: UTF8String): Int = {
+ compare(other)
+ }
+
+ override def equals(other: Any): Boolean = other match {
+ case s: UTF8String =>
+ java.util.Arrays.equals(bytes, s.bytes)
+ case s: String =>
+ bytes.length >= s.length && length() == s.length && toString() == s
+ case _ =>
+ false
+ }
+
+ override def hashCode(): Int = {
+ java.util.Arrays.hashCode(bytes)
+ }
+}
+
+private[sql] object UTF8String {
+ // number of tailing bytes in a UTF8 sequence for a code point
+ private[types] val bytesFromUTF8: Array[Int] = Array(1, 1, 1, 1, 1,
--- End diff --
are there any links you can include for reference?
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