GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/22688
[SPARK-25700][SQL] Creates ReadSupport in only Append Mode in Data Source
V2 write path
## What changes were proposed in this pull request?
Alternative for https://github.com/apache/spark/pull/22686: In other save
modes, we don't need to make a readsupport and read schema.
## How was this patch tested?
Unit test and manual tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark append-revert-2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22688.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 #22688
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commit a445e163675eb330eade07f1cbdd88b99caab117
Author: hyukjinkwon <gurwls223@...>
Date: 2018-10-10T10:38:55Z
Creates ReadSupport in only Append Mode in Data Source V2 write path
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