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

    https://github.com/apache/drill/pull/1227#discussion_r183112258
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/join/HashJoinBatch.java
 ---
    @@ -147,7 +150,19 @@
         NUM_BUCKETS,
         NUM_ENTRIES,
         NUM_RESIZING,
    -    RESIZING_TIME_MS;
    +    RESIZING_TIME_MS,
    +    LEFT_INPUT_BATCH_COUNT,
    +    LEFT_AVG_INPUT_BATCH_BYTES,
    +    LEFT_AVG_INPUT_ROW_BYTES,
    +    LEFT_INPUT_RECORD_COUNT,
    +    RIGHT_INPUT_BATCH_COUNT,
    +    RIGHT_AVG_INPUT_BATCH_BYTES,
    +    RIGHT_AVG_INPUT_ROW_BYTES,
    +    RIGHT_INPUT_RECORD_COUNT,
    +    OUTPUT_BATCH_COUNT,
    +    AVG_OUTPUT_BATCH_BYTES,
    +    AVG_OUTPUT_ROW_BYTES,
    +    OUTPUT_RECORD_COUNT;
    --- End diff --
    
    It is relevant in the sense that they provide high level picture of amount 
of data being processed, memory usage etc. by each operator. This is also 
helpful when debugging trying to figure out what is going on. 


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