GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/12993
[SPARK-15217] [SQL] Always Case Insensitive in HiveSessionState
#### What changes were proposed in this pull request?
In a `HiveSessionState`, which is a given `SparkSession` backed by Hive,
the analysis should not be case sensitive because the underlying Hive Metastore
is case insensitive.
For example,
```SQL
CREATE TABLE tab1 (C1 int);
SELECT C1 FROM tab1
```
In the current implementation, we will get the following error because the
column name is always stored in lower case.
```
cannot resolve '`C1`' given input columns: [c1]; line 1 pos 7
org.apache.spark.sql.AnalysisException: cannot resolve '`C1`' given input
columns: [c1]; line 1 pos 7
```
This PR is to always use case insensitive analysis in `HiveSessionState`,
no matter whether users set `spark.sql.caseSensitive` to true or false.
#### How was this patch tested?
Added the related test cases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark caseSensitive
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12993.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 #12993
----
commit d7d96c34fde79d7078b27733f553deda6bb39fd4
Author: gatorsmile <gatorsm...@gmail.com>
Date: 2016-05-09T00:35:43Z
case insensitive in Hive
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