GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/15336
[SPARK-17767][SQL] Support user-provided ExternalCatalog
## What changes were proposed in this pull request?
Currently, Spark supports ExternalCatalog, but the usage is limited to
`HiveExternalCatalog` by using `private string` variables for class name
holder. This PR aims to parameterize those variables as SQL configuration and
supports `user-provided` ExternalCatalog and SessionState classes.
The following is an intended use case and a snippet of test case in this PR.
```scala
val session = SparkSession.builder()
.master("local")
.config("spark.sql.externalCatalog",
"org.apache.spark.sql.MyExternalCatalog")
.config("spark.sql.externalSessionState",
"org.apache.spark.sql.MySessionState")
.enableProvidedCatalog()
.getOrCreate()
assert(session.sharedState.externalCatalog.isInstanceOf[MyExternalCatalog])
assert(session.sessionState.isInstanceOf[MySessionState])
```
## How was this patch tested?
Pass the Jenkins test with a new test case.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-17767
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15336.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 #15336
----
commit d2bf71cb3c8b104e2df38a300fe1d7a224723b02
Author: Dongjoon Hyun <[email protected]>
Date: 2016-10-03T20:59:43Z
[SPARK-17767][SQL] Support user-provided ExternalCatalog
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