Backport SPARK-17599 and SPARK-17569 to Spark 2.0 branch #15202
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What changes were proposed in this pull request?
This Backports PR #15153 and PR #15122 to Spark 2.0 branch for Structured Streaming.
It is structured a bit differently because similar code paths already existed in the 2.0 branch. The unit test makes sure that both behaviors don't break.