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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