GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/22731
[SPARK-25674][FOLLOW-UP] Update the stats for each ColumnarBatch
## What changes were proposed in this pull request?
This PR is a follow-up of https://github.com/apache/spark/pull/22594 . This
alternative can avoid the unneeded computation in the hot code path.
- For row-based scan, we keep the original way.
- For the columnar scan, we just need to update the stats after each batch.
## How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark udpateStatsFileScanRDD
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22731.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 #22731
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commit 8731588d28f302e51095f7ed1a4331edc5233958
Author: gatorsmile <gatorsmile@...>
Date: 2018-10-15T17:44:39Z
fix
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