Github user andrewor14 commented on a diff in the pull request: https://github.com/apache/spark/pull/12117#discussion_r58455582 --- 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 see... it's because in `lookupFunction` we actually load a persistent function into the registry as a temporary function...
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