GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/14801
[SPARK-17234] [SQL] Table Existence Checking when Index Table with the Same
Name Exists
### What changes were proposed in this pull request?
Hive Index tables are not supported by Spark SQL. Thus, we issue an
exception when users try to access Hive Index tables. When the internal
function `tableExists` tries to access Hive Index tables, it always gets the
same error message: ```Hive index table is not supported```. This message could
be confusing to users, since their SQL operations could be completely unrelated
to Hive Index tables. For example, when users try to alter a table to a new
name and there exists an index table with the same name, the expected exception
should be a `TableAlreadyExistsException`.
This PR made the following changes:
- Introduced a new `AnalysisException` type:
`SQLFeatureNotSupportedException`. When users try to access an `Index Table`,
we will issue a `SQLFeatureNotSupportedException`.
- `tableExists` returns `true` when hitting a
`SQLFeatureNotSupportedException` and the feature is `Hive index table`.
- Add a checking `requireTableNotExists` for `SessionCatalog`'s
`createTable` API; otherwise, the current implementation relies on the Hive's
internal checking.
### How was this patch tested?
Added a test case
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark tableExists
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14801.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 #14801
----
commit 1af428b68c4341192bf8f66af7c434a7b89be61d
Author: gatorsmile <[email protected]>
Date: 2016-08-25T06:26:00Z
fix
commit 664d6f1caa9b3d62eafbddb292991def722910ae
Author: gatorsmile <[email protected]>
Date: 2016-08-25T06:34:16Z
improve test cases
commit c400c5292a32549cea80861adfaefeb41f4d90b3
Author: gatorsmile <[email protected]>
Date: 2016-08-25T07:12:57Z
fix
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