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From "Eric Hanson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-4533) vectorized NotNull operation does not handle short-circuit evaluation for NULL propagation correctly
Date Fri, 10 May 2013 00:03:16 GMT
Eric Hanson created HIVE-4533:
---------------------------------

             Summary: vectorized NotNull operation does not handle short-circuit evaluation
for NULL propagation correctly
                 Key: HIVE-4533
                 URL: https://issues.apache.org/jira/browse/HIVE-4533
             Project: Hive
          Issue Type: Sub-task
            Reporter: Eric Hanson


This code does not look at the selection vector so it may waste time propagating nulls if
the batch has already been filtered. 

A more serious problem is that it only copies over n entries. So if a filter has been applied,
nulls my not be copied over when they should.

    // handle NULLs
    if (inputColVector.noNulls) {
      outV.noNulls = true;
    } else {
      outV.noNulls = false;
      if (inputColVector.isRepeating) {
        outV.isNull[0] = inputColVector.isNull[0];
      } else {
        System.arraycopy(inputColVector.isNull, 0, outV.isNull, 0, n);
      }
    }



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