Question

Suppose I created index with descending order

CREATE INDEX `MyTable.MyIndex`
USING BTREE ON `MyTable` (`DateFrom` DESC, `DateTo` DESC);

I want to get information about it from information_schema.

According to documentation information_schema.statistics table does the job.
However I can’t find any information about column order for indexes (i.e. ASC or DESC).

How can I find that information?

Answer 1

For MySQL version < 8

Where is it written in the documentation that the table statistics does the job ?

Furthermore, I found in the create index doc this:

An index_col_name specification can end with ASC or DESC.
These keywords are permitted for future extensions for specifying ascending or descending index value storage.
Currently, they are parsed but ignored; index values are always stored in ascending order.