Github user nsyca commented on a diff in the pull request:
https://github.com/apache/spark/pull/17450#discussion_r108519047
--- 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 --
Is the function SUBSTRING null-intolerant? What is the return value if
`str` is a null value?
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