GitHub PullRequestEvent at 2014-07-14 04:49:34
Repository: tajo
Actor: babokim
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I added a MaxValueNull flag variable in ColumnStats. If ColumnStats's max value is null, ColumnStats's max value is a non-null value and  MaxValueNull flag is true. So Repartitioner calculates range cardinality with non-null value. Finally Repartitioner set null value to last 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