Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/12885#discussion_r62130890
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/functions.scala
---
@@ -129,7 +129,16 @@ case class DescribeFunction(
result
}
- case None => Seq(Row(s"Function: $functionName not found."))
+ case None =>
+ val currentDb =
sparkSession.sessionState.catalog.getCurrentDatabase
+ if (sparkSession.externalCatalog.functionExists(currentDb,
functionName)) {
+ val catalogFunction =
sparkSession.externalCatalog.getFunction(currentDb, functionName)
+ Row(s"Function: ${catalogFunction.identifier}") ::
+ Row(s"Class: ${catalogFunction.className}") ::
+ Row(s"Usage: N/A") :: Nil
+ } else {
+ Seq(Row(s"Function: $functionName not found."))
+ }
--- End diff --
Looks like we only need to change
https://github.com/apache/spark/pull/12885/files#diff-d2a203f08c862bd762e6740c16e972f7R118
to `sparkSession.sessionState.catalog.lookupFunctionInfo`?
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