GitHub user wzhfy opened a pull request:
https://github.com/apache/spark/pull/16243
[SPARK-18815] [SQL] Fix NPE when collecting column stats for string/binary
column having only null values
## What changes were proposed in this pull request?
During column stats collection, average and max length will be null if a
column of string/binary type has only null values. To fix this, I use default
size when avg/max length is null.
## How was this patch tested?
Add a test for handling null columns
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wzhfy/spark nullStats
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16243.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 #16243
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commit 674cd7cac3d542f1b1379fef416e3fce2bbc8cbc
Author: wangzhenhua <[email protected]>
Date: 2016-12-10T03:19:19Z
use default size for null columns
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