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rows not distributed evenly across processors

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Values from execution plan:

thread 1 - 78 million rows

thread 2 - 756,000 rows

thread 3 - 836,000

thread 4 - 731,000

thread 5 - 182,000

thread 6 - 158,000

thread 7 - 193,000

thread 8 - 301,000

Is there a trick to evenly distributing the rows across the threads? I feel this might decrease the query execution time.


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