Github user nsyca commented on a diff in the pull request: https://github.com/apache/spark/pull/17450#discussion_r108720888 --- 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 might be confused with the terminologies: NullIntolerant expression versus "null-intolerant predicate". But if SUBSTRING is marked null-intolerant expression, why do we not mark the class of string functions such as CONTAINS, STARTSWITH, etc. the same way? Am I missing anything here?
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