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[SPARK-17394][SQL] should not allow specify database in table/view na…
…me after RENAME TO ## What changes were proposed in this pull request? It's really weird that we allow users to specify database in both from table name and to table name in `ALTER TABLE RENAME TO`, while logically we can't support rename a table to a different database. Both postgres and MySQL disallow this syntax, it's reasonable to follow them and simply our code. ## How was this patch tested? new test in `DDLCommandSuite` Author: Wenchen Fan <wenchen@databricks.com> Closes apache#14955 from cloud-fan/rename.
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