[SPARK-11482][SQL] Make maven repo for Hive metastore jars configurable

[xguo27]

Introducing a property called "spark.sql.hive.maven.repo" to let user configure the maven repository to download Hive Metastore jars.

[WangTaoTheTonic]

I think it can be used for who have their custom hive hosted on their own maven repository.

Though using maven to download hive metastore jars is using for test, I still think this is a nice feature.

[xguo27]

Thanks WangTao for your comment!

Based on the comment on my other PR for Spark-11562, I will also add documentation for this.

[xguo27]

@marmbrus@rxin What do you think about this change?

[rxin]

I think this is fine to add.

[rxin]

Jenkins, test this please.

[xguo27]

@rxin Thanks, Reynold! Somehow no test was triggered. Not sure why.

[SparkQA]

Test build #2095 has finished for PR 9543 at commit 92cb677.

• This patch fails Scala style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[xguo27]

@rxin Sorry about the failure, can we re-test please?

[SparkQA]

Test build #2100 has finished for PR 9543 at commit f109baf.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[rxin]

either put each on one line, or don't wrap them at all here.

[xguo27]

@yhuai I see your latest delivery has conflict with this PR, I have resolved the conflict and re-pushed. @rxin has been reviewing this PR, I figure you might also want to review this PR, just in case I break your code.

Thanks!

[yhuai]

Can you use HIVE_METASTORE_MAVEN_REPO's default value at here? So, in case we update that default value, this one will be updated as well.

[yhuai]

@xguo27 Can I ask what is your specific use case for this?

[xguo27]

Thanks @yhuai for reviewing my code! I have updated per your suggestion.

To answer your question, I personally do not have a use case for this. My take on the JIRA reporter's use case is that user might host their own customized/modified Hive jars on their maven site which might provide specific functionality.

[AmplabJenkins]

Can one of the admins verify this patch?

[rxin]

I'm going to close this one for now.