`information_schema.statistics.collation`

mysql

type: VARCHAR NULL

5.7-8

type: NULL

Note:

A for sorted in ascending order, or NULL for unsorted.

5.1-10.8

type: VARCHAR(1) NULL

Note:

The sorting method of the columns in the index. The value can be A (ascending order), D (descending order) or NULL (unsorted).

4-6.1

type: unknown

Note:

Always NULL (unsupported by CockroachDB).

1-21.2