Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21031#discussion_r182816541
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
---
@@ -407,6 +407,7 @@ object FunctionRegistry {
expression[MapKeys]("map_keys"),
expression[MapValues]("map_values"),
expression[Size]("size"),
+ expression[Cardinality]("cardinality"),
--- End diff --
Alias names are implemented like that. No need to create a new one. We did
it in the other SQL functions too. like char, char_length and many. We can
update the description in the existing ExpressionDescription
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