Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19086#discussion_r136745765
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
---
@@ -569,46 +569,51 @@ class SessionCatalog(
/**
* Rename a table.
*
- * If a database is specified in `oldName`, this will rename the table
in that database.
+ * If the database specified in `newName` is different from the one
specified in `oldName`,
+ * It will result in moving table across databases.
+ *
* If no database is specified, this will first attempt to rename a
temporary table with
- * the same name, then, if that does not exist, rename the table in the
current database.
+ * the same name, then, if that does not exist, current database will be
used for locating
+ * `oldName` or `newName`.
--- End diff --
This is wrong, right? This is for `temp view`
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