Github user tejasapatil commented on a diff in the pull request:
https://github.com/apache/spark/pull/16476#discussion_r95054878
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -340,3 +341,91 @@ object CaseKeyWhen {
CaseWhen(cases, elseValue)
}
}
+
+/**
+ * A function that returns the index of str in (str1, str2, ...) list or 0
if not found.
--- End diff --
change `str` to `expr` here as well.
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