`information_schema.routines.character_maximum_length`

mysql

type: BIGINT NULL

5.7-8

type: NULL

Note:

Maximum length.

5.1-10.8

type: CARDINAL_NUMBER NULL

Note:

Always null, since this information is not applied to return data types in PostgreSQL

10-15

type: CARDINAL_NUMBER

Note:

Always null, since this information is not applied to return data types in PostgreSQL

7.4-9.6

type: NULL

Note:

Always NULL.

type: INT NULL

Note:

Maximum length in characters, if the return type is a character type. -1 for xml and large-value type data.