Github user nsyca commented on a diff in the pull request:
https://github.com/apache/spark/pull/17450#discussion_r108778378
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -1122,7 +1119,7 @@ case class StringSpace(child: Expression)
""")
// scalastyle:on line.size.limit
case class Substring(str: Expression, pos: Expression, len: Expression)
- extends TernaryExpression with ImplicitCastInputTypes {
+ extends TernaryExpression with ImplicitCastInputTypes with
NullIntolerant {
--- End diff --
I will certainly take a look. On a second thought, since "most" of the SQL
functions are null-intolerant, isn't easier to mark only functions that are
null-tolerant such as ISNOTNULL? I am just pitching an idea here, not
indicating we should abandon this PR.
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