Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/7588#discussion_r35185783
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SqlParser.scala ---
@@ -271,8 +271,7 @@ class SqlParser extends AbstractSparkSQLParser with
DataTypeParser {
lexical.normalizeKeyword(udfName) match {
case "sum" => SumDistinct(exprs.head)
case "count" => CountDistinct(exprs)
- case name => UnresolvedFunction(name, exprs, isDistinct = true)
- case _ => throw new AnalysisException(s"function $udfName does not
support DISTINCT")
+ case _ => UnresolvedFunction(udfName, exprs, isDistinct = true)
--- End diff --
Since we can register a UDAF and use DISTINCT with it, we can just create
an `UnresolvedFunction` at here. If it is actually a built-in aggregate
function and it does not support DISTINCT, we will throw an error later.
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