GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/12047
[SPARK-14224] [SPARK-14223] [SQL] fix RowEncoder and parquet reader for
wide table
## What changes were proposed in this pull request?
1) fix the RowEncoder for wide table (many columns) by splitting the
generate code into multiple functions.
2) Disable the returning columnar batch in parquet reader if there are many
columns.
3) Added a internal config for maximum number of fields (nested) columns
supported by whole stage codegen.
## How was this patch tested?
Add a tests for table with 1000 columns.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark many_columns
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12047.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 #12047
----
commit 872ecf5341138f075fcc5e8c0caedbd0d1d0e8fd
Author: Davies Liu <[email protected]>
Date: 2016-03-29T21:42:54Z
fix RowEncoder and parquet reader for wide table
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