[MDEV-26939] support descending indexes for simple ORDER BY - Jira

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in cases like

CREATE TABLE t1 (a INT, b INT, INDEX (a DESC, b ASC));

...

SELECT * FROM t1 ORDER BY a DESC, b ASC;

In other cases descending indexes could be treated as disabled.

is part of

MDEV-13756 Implement descending index: KEY (a DESC, b ASC)

relates to

MDEV-26996 Support descending indexes in the range optimizer