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https://issues.apache.org/jira/browse/CARBONDATA-246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15499475#comment-15499475
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ASF GitHub Bot commented on CARBONDATA-246:
-------------------------------------------

Github user gvramana commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/161#discussion_r79289428
  
    --- Diff: 
integration/spark/src/main/scala/org/apache/carbondata/spark/rdd/CarbonMergerRDD.scala
 ---
    @@ -259,6 +253,9 @@ class CarbonMergerRDD[K, V](
             )
           )
     
    +      // keep on assigning till last one is reached.
    +      blocksOfLastSegment = blocksOfOneSegment.asJava
    --- End diff --
    
    add null check and size check


>  compaction is wrong in case if last segment is not assigned to an executor.
> ----------------------------------------------------------------------------
>
>                 Key: CARBONDATA-246
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-246
>             Project: CarbonData
>          Issue Type: Bug
>            Reporter: ravikiran
>
> if during compaction of 4 loads, for any executor if only first 3 loads task 
> is assigned then the col cardinality calculation based on the last segment 
> info will become wrong.
> in this case the cardinality will go wrong for that executor.



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