[SPARK-14630][Build][Core][SQL][Streaming] Code style: public abstract methods should have explicit return types #12389
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What changes were proposed in this pull request?
Currently many public abstract methods (in abstract classes as well as traits) don't declare return types explicitly, such as in o.a.s.streaming.dstream.InputDStream:
These methods exist in core, sql, streaming; this PR fixes them.
How was this patch tested?
N/A
Which piece of scala style rule led to the changes?
the rule was added separately in #12396