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  1. MariaDB Server
  2. MDEV-37933

FULL OUTER JOIN: Convert to LEFT/INNER when possible

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    Description

      Taking a part of MDEV-36813:

      Current optimizer converts LEFT JOIN into INNER JOIN based on null-rejecting predicates. This is done in simplify_joins().

      Similarly, one can convert FULL OUTER JOIN into LEFT/RIGHT JOIN based on null-rejecting predicates.

      This is what this MDEV does.

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            monty Michael Widenius
            psergei Sergei Petrunia
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