Github user tarekauel commented on a diff in the pull request:
https://github.com/apache/spark/pull/7534#discussion_r34976319
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -628,24 +623,59 @@ case class Substring(str: Expression, pos:
Expression, len: Expression)
override def eval(input: InternalRow): Any = {
val string = str.eval(input)
- val po = pos.eval(input)
- val ln = len.eval(input)
-
- if ((string == null) || (po == null) || (ln == null)) {
- null
--- End diff --
I created a nested if in order to avoid evaluation of the 2nd or 3rd
argument, if one of them is already null.
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