GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/15099
[SPARK-17541][SQL] fix some DDL bugs about table management when same-name
temp view exists
## What changes were proposed in this pull request?
In `SessionCatalog`, we have several operations(`tableExists`, `dropTable`,
`loopupRelation`, etc) that handle both temp views and metastore tables/views.
This brings some bugs to DDL commands that want to handle temp view only or
metastore table/view only. These bugs are:
1. `CREATE TABLE USING` will fail if a same-name temp view exists
2. `Catalog.dropTempView`will un-cache and drop metastore table if a
same-name table exists
3. `saveAsTable` will fail or have unexpected behaviour if a same-name temp
view exists.
These bug fixes are pulled out from
https://github.com/apache/spark/pull/14962 and targets both master and 2.0
branch
## How was this patch tested?
new regression tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark fix-view
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15099.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 #15099
----
commit 7fcee4501114793d508f0f6add1915572b48b587
Author: Wenchen Fan <wenc...@databricks.com>
Date: 2016-09-14T16:50:22Z
fix some DDL bugs about table management when same-name temp view exists
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