Github user jose-torres commented on the issue:
https://github.com/apache/spark/pull/20710
My primary concern with splitting the interfaces is that it makes it easy
for Spark changes to accidentally do the wrong thing. Callers of
DataWriterFactory.createDataWriter() won't necessarily notice that there's a
StreamingDataWriterFactory which needs to be supported; they'd likely just end
up writing code which will break with an opaque internal error in a streaming
query.
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