Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/12117#discussion_r58472411
--- 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)
+ }
externalCatalog.dropFunction(db, name.funcName)
}
/**
- * Alter a metastore function whose name that matches the one specified
in `funcDefinition`.
- *
- * If no database is specified in `funcDefinition`, assume the function
is in the
- * current database.
- *
- * Note: If the underlying implementation does not support altering a
certain field,
- * this becomes a no-op.
- */
- def alterFunction(funcDefinition: CatalogFunction): Unit = {
- val db = funcDefinition.identifier.database.getOrElse(currentDb)
- val newFuncDefinition = funcDefinition.copy(
- identifier = FunctionIdentifier(funcDefinition.identifier.funcName,
Some(db)))
- externalCatalog.alterFunction(db, newFuncDefinition)
- }
-
- /**
* Retrieve the metadata of a metastore function.
*
* If a database is specified in `name`, this will return the function
in that database.
* If no database is specified, this will return the function in the
current database.
*/
+ // TODO: have a better name. This method is actually for fetching the
metadata of a function.
def getFunction(name: FunctionIdentifier): CatalogFunction = {
val db = name.database.getOrElse(currentDb)
externalCatalog.getFunction(db, name.funcName)
}
+ /**
+ * Check if a function is already existing.
+ *
+ */
+ def functionExists(name: FunctionIdentifier): Boolean = {
+ if (functionRegistry.functionExists(name.unquotedString)) {
+ // This function exists in the FunctionRegistry.
+ true
+ } else {
+ // Need to check if this function exists in the metastore.
+ try {
+ getFunction(name) != null
+ } catch {
+ case _: NoSuchFunctionException => false
+ case _: AnalysisException => false // HiveExternalCatalog wraps
all exceptions with it.
--- End diff --
Added a TODO.
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