Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/12117#discussion_r58454715
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
---
@@ -428,53 +432,85 @@ class SessionCatalog(
*/
def dropFunction(name: FunctionIdentifier): Unit = {
val db = name.database.getOrElse(currentDb)
+ val qualified = name.copy(database = Some(db)).unquotedString
+ if (functionRegistry.functionExists(qualified)) {
+ // If we have loaded this function into FunctionRegistry,
+ // also drop it from there.
+ functionRegistry.dropFunction(qualified)
--- End diff --
I don't understand why we have to do this. Isn't the function registry only
for temporary functions? We only put things in it in `createTempFunction`, so
we just only remove things from it in `dropTempFunction`. This method here is
for persistent functions only.
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