gkodinov/kgeorge@magare.gmz a2afc56f61 Bug #31001: ORDER BY DESC in InnoDB not working ...

The optimizer sets index traversal in reverse order only if there are 
 used key parts that are not compared to a constant.
However using the primary key as an ORDER BY suffix rendered the check
incomplete : going in reverse order must still be used even if 
all the parts of the secondary key are compared to a constant.

Fixed by relaxing the check and set reverse traversal even when all
the secondary index keyparts are compared to a const.
Also account for the case when all the primary keys are compared to a
constant.

2007-09-14 17:43:14 +03:00

366 B

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