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sql: bugfix to interleaved join planning criteria #26756

Merged
merged 1 commit into from
Jun 18, 2018
Merged

sql: bugfix to interleaved join planning criteria #26756

merged 1 commit into from
Jun 18, 2018

Commits on Jun 15, 2018

  1. sql: bugfix to interleaved join planning criteria 

    Previously, interleaved joins could take place if the tables were
ancestors of each other, there was a merge join ordering on the equality
columns, and the left equality columns were a prefix of the interleaved
columns. These criteria are insufficient: the right equality columns
must also be a prefix of the interleaved columns. A case where this
wouldn't naturally hold is where the right equality columns get a merge
join ordering because they're known to be constant.

Release note (bug fix): joins across two interleaved tables no longer
return incorrect results under certain circumstances when the equality
columns aren't all part of the interleaved columns.
    @jordanlewis
    jordanlewis committed Jun 15, 2018
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