GitHub user mgaido91 opened a pull request:
https://github.com/apache/spark/pull/22556
[MINOR] Remove useless InSubquery expression
## What changes were proposed in this pull request?
The PR removes the `InSubquery` expression which was introduced a long time
ago and its only usage was removed in
https://github.com/apache/spark/commit/4ce970d71488c7de6025ef925f75b8b92a5a6a79.
Hence it is not used anymore.
## How was this patch tested?
existing UTs
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mgaido91/spark minor_insubq
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22556.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 #22556
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