Ben-Zvi opened a new pull request #1650: DRILL-6707: Allow Merge-Join batch resizing to go smaller than current outgoing row count URL: https://github.com/apache/drill/pull/1650 The source of the bug was retaining a checkArgument, which originally did a sanity check that 64K (the old batch size) was not exceeded. When batch resizing was implemented for Merge-Join, that checkArgument was kept (with the new target size). So when the batch was resized while the outgoing already had more rows than the new target, the next check for a full outgoing hit that checkArgument and caused this failure. The fix: Remove that checkArgument. (The other code changes are for debug or cosmetics).
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