GitHub user bomeng opened a pull request:
https://github.com/apache/spark/pull/12709
[SPARK-14928] [SQL] support substitution in SET key=value
## What changes were proposed in this pull request?
In the `SET key=value` command, value can be defined as a variable and
replaced by substitution.
Since we have `VARIABLE_SUBSTITUTE_ENABLED` and `VARIABLE_SUBSTITUTE_DEPTH`
defined in the SQLConf, it is nice to use them in the SET command.
## How was this patch tested?
New test case was added to test this function.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/bomeng/spark SPARK-14928
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12709.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 #12709
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commit 98f148dc902713df747915ba32703ac6a262226c
Author: bomeng <bm...@us.ibm.com>
Date: 2016-04-26T20:03:36Z
support substitution
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