Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/5350#discussion_r27752953
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -258,11 +253,18 @@ case class Substring(str: Expression, pos:
Expression, len: Expression) extends
null
} else {
val start = po.asInstanceOf[Int]
- val length = ln.asInstanceOf[Int]
-
+ val length = ln.asInstanceOf[Int]
string match {
- case ba: Array[Byte] => slice(ba, start, length)
- case other => slice(other.toString, start, length)
+ case ba: Array[Byte] =>
+ val (st, end) = slicePos(start, length, () => ba.length)
+ ba.slice(st, end)
+ case s: UTF8String =>
+ val (st, end) = slicePos(start, length, () => s.length)
+ s.slice(st, end)
+ case other =>
--- End diff --
Yes, This case is added to match the old behavior, or some test will fail
(other is Integer, maybe we does not check the dataType for substr?)
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