Github user zhichao-li commented on a diff in the pull request:
https://github.com/apache/spark/pull/7641#discussion_r35732675
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -699,8 +732,12 @@ case class Substring(str: Expression, pos: Expression,
len: Expression)
if (posEval != null) {
val lenEval = len.eval(input)
if (lenEval != null) {
- stringEval.asInstanceOf[UTF8String]
- .substringSQL(posEval.asInstanceOf[Int],
lenEval.asInstanceOf[Int])
+ str.dataType match {
+ case StringType => stringEval.asInstanceOf[UTF8String]
+ .substringSQL(posEval.asInstanceOf[Int],
lenEval.asInstanceOf[Int])
+ case BinaryType =>
Substring.subStringBinarySQL(stringEval.asInstanceOf[Array[Byte]],
--- End diff --
`Substring#subStringBinarySQL` is created on purpose for the index in
byte, but the `substringSQL` is operate on the index of code point.
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