GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/15434
[SPARK-17873][SQL] ALTER TABLE RENAME TO should allow users to specify
database in destination table name
## What changes were proposed in this pull request?
In #14955 , we forbid users to specify database of destination table in
ALTER TABLE RENAME TO, to be consistent with other database systems and also
make it easier to rename tables in non-current database, e.g. users can write
`ALTER TABLE db1.tbl RENAME TO tbl2`, instead of `ALTER TABLE db1.tbl RENAME TO
db1.tbl2`.
However, this is a breaking change. Users may already have queries that
specify database of destination table in ALTER TABLE RENAME TO.
This PR reverts most of #14955 , and simplify the usage of ALTER TABLE
RENAME TO by making database of source table the default database of
destination table, instead of current database, so that users can still write
`ALTER TABLE db1.tbl RENAME TO tbl2`.
## How was this patch tested?
The added back tests and some new tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark revert
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15434.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #15434
----
commit d14c8629b8815dd2a8aa5ed720d699b235c54be0
Author: Wenchen Fan <wenc...@databricks.com>
Date: 2016-10-11T08:47:37Z
temp
commit 393dc6542bb207f812a4af57211ad5e2a3a94dc5
Author: Wenchen Fan <wenc...@databricks.com>
Date: 2016-10-11T14:29:35Z
fix RENAME TO
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