information_schema.statistics.packed

mysql

type: BINARY NULL
5.7-8

mariadb

type: NULL
Note:
NULL if not packed, otherwise how the index is packed.
© 2022 MariaDB
5.1-10.8

tidb

type: VARCHAR(10) NULL
Note:
TiDB does not use this field. This value is always NULL.
© 2022 PingCAP
4-6.1

postgres

cockroachdb

mssql