GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/20153
[SPARK-22392][SQL] data source v2 columnar batch reader
## What changes were proposed in this pull request?
a new Data Source V2 interface to allow the data source to return
`ColumnarBatch` during the scan.
## How was this patch tested?
new tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark columnar-reader
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20153.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 #20153
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