GitHub user tdas opened a pull request:
https://github.com/apache/spark/pull/13653
[SPARK-15933][SQL][STREAMING] Refactored DF reader-writer to use readStream
and writeStream for streaming DFs
## What changes were proposed in this pull request?
Currently, the DataFrameReader/Writer has method that are needed for
streaming and non-streaming DFs. This is quite awkward because each method in
them through runtime exception for one case or the other. So rather having half
the methods throw runtime exceptions, its just better to have a different
reader/writer API for streams.
## How was this patch tested?
Existing unit tests + two sets of unit tests for DataFrameReader/Writer and
DataStreamReader/Writer.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tdas/spark SPARK-15933
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13653.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 #13653
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