ulysses-you commented on a change in pull request #28840:
URL: https://github.com/apache/spark/pull/28840#discussion_r454098536
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/functions.scala
##########
@@ -236,6 +236,45 @@ case class ShowFunctionsCommand(
}
}
+
+/**
+ * A command for users to refresh the persistent function.
+ * The syntax of using this command in SQL is:
+ * {{{
+ * REFRESH FUNCTION functionName
+ * }}}
+ */
+case class RefreshFunctionCommand(
+ databaseName: Option[String],
+ functionName: String)
+ extends RunnableCommand {
+
+ override def run(sparkSession: SparkSession): Seq[Row] = {
+ val catalog = sparkSession.sessionState.catalog
+ if
(FunctionRegistry.builtin.functionExists(FunctionIdentifier(functionName))) {
+ throw new AnalysisException(s"Cannot refresh builtin function
$functionName")
+ }
+ if (catalog.isTemporaryFunction(FunctionIdentifier(functionName,
databaseName))) {
+ throw new AnalysisException(s"Cannot refresh temporary function
$functionName")
+ }
+
+ val identifier = FunctionIdentifier(
+ functionName, Some(databaseName.getOrElse(catalog.getCurrentDatabase)))
+ // we only refresh the permanent function.
+ if (catalog.isPersistentFunction(identifier)) {
+ // register overwrite function.
+ val func = catalog.getFunctionMetadata(identifier)
+ catalog.registerFunction(func, true)
+ } else {
+ // function is not exists, clear cached function.
Review comment:
If function already in cache, query can still work after we drop
function with hive client.
I think the behavior of `refresh` should be that invalid the cache and keep
consistent with hive metastore.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
