luocooong opened a new pull request, #2580:
URL: https://github.com/apache/drill/pull/2580

   # [DRILL-8253](https://issues.apache.org/jira/browse/DRILL-8253): Support 
the limit results in kafka scan
   
   ## Description
   In the current implementation of the kafka storage, although we use the 
limit detection method in the result loader, but the actual `maxRecords` is 
always -1.
   
   The mechanism for this revision is to get limit (SQL parsing from the 
execution plan stage) from the group scan, then pass it to the sub-scan, and 
finally process it in the result loader.
   
   ## Documentation
   N/A
   
   ## Testing
   Added the unit test. KafkaQueriesTest#testResultLimit()
   


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