Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21031#discussion_r181622107
--- 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 --
`expression[Size]("cardinality"),` Does this work?
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