GitHub user wangyum opened a pull request:
https://github.com/apache/spark/pull/22903
[SPARK-24196][SQL] Implement Spark's own GetSchemasOperation
## What changes were proposed in this pull request?
This PR fix SQL Client tools can't show DBs by implementing Spark's own
`GetSchemasOperation`.
## How was this patch tested?
unit tests and manual tests


You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wangyum/spark SPARK-24196
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22903.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 #22903
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commit e4f7205cf07ab9230f1546b70ff115d92184c8b7
Author: Yuming Wang <yumwang@...>
Date: 2018-10-31T10:36:58Z
Add GetSchemasOperation
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