Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/3247#discussion_r27717539 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala --- @@ -26,9 +26,12 @@ trait FunctionRegistry { def registerFunction(name: String, builder: FunctionBuilder): Unit - def lookupFunction(name: String, children: Seq[Expression]): Expression - def caseSensitive: Boolean + + def lookupFunction( + name: String, + children: Seq[Expression], + distinct: Boolean = false): Expression --- End diff -- Hmm, I have not a smart idea. Does you know a similar logic to look up user-defined functions in hive?
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