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https://issues.apache.org/jira/browse/DRILL-6123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16359157#comment-16359157
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ASF GitHub Bot commented on DRILL-6123:
---------------------------------------

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

    https://github.com/apache/drill/pull/1107#discussion_r167380761
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/spill/RecordBatchSizer.java
 ---
    @@ -311,8 +311,8 @@ public static ColumnSize getColumn(ValueVector v, 
String prefix) {
     
       public RecordBatchSizer(RecordBatch batch) {
         this(batch,
    -         (batch.getSchema().getSelectionVectorMode() == 
BatchSchema.SelectionVectorMode.TWO_BYTE) ?
    -         batch.getSelectionVector2() : null);
    +      (batch.getSchema() == null ? null : 
(batch.getSchema().getSelectionVectorMode() == 
BatchSchema.SelectionVectorMode.TWO_BYTE ?
    --- End diff --
    
    yes, we can get empty batches with empty schema  and I think it makes sense 
to add the check here instead of calling code. That way, it be transparently 
handled underneath. 


> Limit batch size for Merge Join based on memory
> -----------------------------------------------
>
>                 Key: DRILL-6123
>                 URL: https://issues.apache.org/jira/browse/DRILL-6123
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Execution - Flow
>    Affects Versions: 1.12.0
>            Reporter: Padma Penumarthy
>            Assignee: Padma Penumarthy
>            Priority: Major
>             Fix For: 1.13.0
>
>
> Merge join limits output batch size to 32K rows irrespective of row size. 
> This can create very large or very small batches (in terms of memory), 
> depending upon average row width. Change this to figure out output row count 
> based on memory specified with the new outputBatchSize option and average row 
> width of incoming left and right batches. Output row count will be minimum of 
> 1 and max of 64k. 



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