viirya commented on a change in pull request #25452: [SPARK-28710][SQL]to fix
replace function, spark should call drop and create function
URL: https://github.com/apache/spark/pull/25452#discussion_r358336153
##########
File path:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala
##########
@@ -1282,7 +1282,16 @@ private[spark] class HiveExternalCatalog(conf:
SparkConf, hadoopConf: Configurat
val functionName =
funcDefinition.identifier.funcName.toLowerCase(Locale.ROOT)
requireFunctionExists(db, functionName)
val functionIdentifier = funcDefinition.identifier.copy(funcName =
functionName)
- client.alterFunction(db, funcDefinition.copy(identifier =
functionIdentifier))
+ val newDefinition = funcDefinition.copy(identifier = functionIdentifier)
+ isResourceChanged(db, newDefinition) match {
+ // as of now Hive only alter name, owner, class name, type but not
resource URI
+ // So in order to replace function with resource spark needs to delete
and create the function
+ case true => client.dropFunction(db, functionName)
+ client.createFunction(db, newDefinition)
+ // replace the function in the metastore if there is no change in the
resource
+ case _ =>
+ client.alterFunction(db, newDefinition)
Review comment:
From Hive
[DDL](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-Create/Drop/ReloadFunction),
looks like it does not have "replace" in create function:
```
CREATE FUNCTION [db_name.]function_name AS class_name
[USING JAR|FILE|ARCHIVE 'file_uri' [, JAR|FILE|ARCHIVE 'file_uri'] ];
```
Maybe it is why this API does not do resource replacement?
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