GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/4691
[SPARK-5907][SQL] Selected column from DataFrame should not re-analyze
logical plan
Currently, selecting a column from DataFrame wraps the original logical
plan with a Project. As the column is used, the logical plan will be analyzed
again. For some query plan, re-analyzing would side-effect that increases
expression id. So when accessing the column, column's expr and its analyzed
plan will point to different expressions.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 not_reanalyzed
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/4691.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 #4691
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commit 7c8a2ed529843092c92ca55b8f29bc6094dd2105
Author: Liang-Chi Hsieh <[email protected]>
Date: 2015-02-19T14:18:05Z
Selected column from DataFrame should not re-analyze logical plan.
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