Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/12121#discussion_r58418148
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
---
@@ -547,4 +552,23 @@ class SessionCatalog(
functionRegistry.lookupFunctionBuilder(name)
}
+
+ // -----------------
+ // | Other methods |
+ // -----------------
+
+ /**
+ * Drop all existing databases (except "default") along with all
associated tables,
+ * partitions and functions, and set the current database to "default".
+ */
+ def reset(): Unit = {
+ val default = "default"
+ listDatabases().filter(_ != default).foreach { db =>
+ dropDatabase(db, ignoreIfNotExists = false, cascade = true)
+ }
+ tempTables.clear()
+ functionRegistry.clear()
--- End diff --
right now this removes all functions (builtin or not). This is mainly used
for tests only so I think it's OK.
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