GitHub user saucam opened a pull request:
https://github.com/apache/spark/pull/5298
[WIP][SQL][SPARK-6632]: Read schema from each input split in the
ReadSupport hook, reconciling with the metastore schema at that time
Hey @liancheng,
How about this approach for schema reconciliation, where we use the
metastore schema, and reconcile within the ReadSupport init function. This way,
we handle each input file in the map task, and no need to read schema from all
part files and merging before initiating the tasks.
I have not removed the merge code for now. Let me know your thoughts on
this one.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/saucam/spark SPARK-6632
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/5298.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 #5298
----
commit 304daccb4e6b947eb10a8feb893ca5b47c42e16e
Author: Yash Datta <[email protected]>
Date: 2015-03-31T13:11:40Z
SPARK-6632: Read schema from each input split in the ReadSupport hook,
reconciling with the metastore schema at that time
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