Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/13413#discussion_r66563267
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
---
@@ -855,7 +855,8 @@ class SessionCatalog(
.map { f => FunctionIdentifier(f, Some(dbName)) }
val loadedFunctions =
StringUtils.filterPattern(functionRegistry.listFunction(), pattern)
.map { f => FunctionIdentifier(f) }
- dbFunctions ++ loadedFunctions
+ val builtInFunctions = FunctionRegistry.builtin.listFunction().toSet
--- End diff --
Let's avoid of creating this set in every `listFunctions` call.
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