Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15544#discussion_r139188326
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
---
@@ -270,6 +270,7 @@ object FunctionRegistry {
expression[Remainder]("%"),
// aggregate functions
+
expression[ApproxCountDistinctForIntervals]("approx_count_distinct_for_intervals"),
--- End diff --
If it's only used internally, we don't need to register it here.
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