apache / carbondata / 883

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jenkins

[HOTFIX] Fixed Query performance issue

Problem: Query performance is slower than 1.4
Root cause: In CarbonScanRDD it is getting TaskContext onCompleteCallbacks Field using reflection to check whether already InsertTaskCompletionListener is already added or not to avoid adding two taskcompletion listener in case of insert into. This Scala reflection call is taking ~2 seconds for each query task. Because of this query is slower.
Solution: Now added Java reflection to get the onCompleteCallbacks field from TaskContextImpl class
Query Time:
Old: ~59 seconds
New: ~33 seconds

This closes #2622

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