Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/16476#discussion_r95718514 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala --- @@ -340,3 +344,96 @@ object CaseKeyWhen { CaseWhen(cases, elseValue) } } + +/** + * A function that returns the index of expr in (expr1, expr2, ...) list or 0 if not found. + * It takes at least 2 parameters, and all parameters should be subtype of AtomicType or NullType. + * It's also acceptable to give parameters of different types. + * If the search string is NULL, the return value is 0 because NULL fails equality comparison with any value. --- End diff -- search string -> search expression?
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