GitHub user mgaido91 opened a pull request:
https://github.com/apache/spark/pull/21080
[SPARK-23986][SQL] freshName can generate non-unique names
## What changes were proposed in this pull request?
We are using `CodegenContext.freshName` to get a unique name for any new
variable we are adding. Unfortunately, this method currently fails to create a
unique name when we request more than one instance of variables with starting
name `name1` and an instance with starting name `name11`.
The PR changes the way a new name is generated by
`CodegenContext.freshName` so that we generate unique names in this scenario
too.
## How was this patch tested?
added UT
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mgaido91/spark SPARK-23986
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21080.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 #21080
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commit 8623918adf88609f8a4e0ad6b69ad5c1d54bdc86
Author: Marco Gaido <marcogaido91@...>
Date: 2018-04-16T12:58:02Z
[SPARK-23986][SQL] freshName can generate non-unique names
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