GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/22686
[SPARK-25700][SQL] Partially revert append mode support in Data Source V2
## What changes were proposed in this pull request?
This PR partially revert
https://github.com/apache/spark/commit/5fef6e3513d6023a837c427d183006d153c7102b
It happened to create a readsupport in write path, which ended up with
reading schema from readsupport at write path.
See also https://github.com/apache/spark/pull/22009#discussion_r223982672
## How was this patch tested?
Manually facing an issue.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark append-revert
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22686.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 #22686
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commit 54e59d53c0d91288536644819d8ead80e13475ea
Author: hyukjinkwon <gurwls223@...>
Date: 2018-10-10T08:57:53Z
Partially revert append mode support in Datasource V2
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