Sergei Petrunia 99cd5a962c MDEV-8989: ORDER BY optimizer ignores equality propagation ...

Variant #4 of the fix.

Make ORDER BY optimization functions take into account multiple
equalities. This is done in several places:
- remove_const() checks whether we can sort the first table in the
  join, or we need to put rows into temp.table and then sort.
- test_if_order_by_key() checks whether there are indexes that
  can be used to produce the required ordering
- make_unireg_sortorder() constructs sort criteria for filesort.

2016-05-23 21:17:18 +03:00

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