[patch] ENUM errdetail should mention bytes, not chars

Hi

The errdetail emitted when creating/modifying an ENUM value is misleading:

    postgres=# CREATE TYPE enum_valtest AS ENUM (
                'foo',
                'ああああああああああああああああああああああ'
               );
    ERROR:  invalid enum label "ああああああああああああああああああああああ"
    DETAIL:  Labels must be 63 characters or less.

Attached trivial patch changes the message to:

    DETAIL:  Labels must be 63 bytes or less.

This matches the documentation, which states:

    The length of an enum value's textual label is limited by the NAMEDATALEN
    setting compiled into PostgreSQL; in standard builds this means at most
    63 bytes.

    https://www.postgresql.org/docs/current/datatype-enum.html

I don't see any particular need to backpatch this.


Regards

Ian Barwick


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