Обсуждение: pgsql: Update: < * Allow adding enumerated values to an existing

Log Message:
-----------
Update:

< * Allow adding enumerated values to an existing enumerated data
> * Allow adding/removing enumerated values to an existing enumerated data

Modified Files:
--------------
    pgsql/doc:
        TODO (r1.2437 -> r1.2438)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/TODO?r1=1.2437&r2=1.2438)
    pgsql/doc/src/FAQ:
        TODO.html (r1.943 -> r1.944)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html?r1=1.943&r2=1.944)

Bruce Momjian wrote:
> Log Message:
> -----------
> Update:
>
> < * Allow adding enumerated values to an existing enumerated data
>
>> * Allow adding/removing enumerated values to an existing enumerated data
>>
>
>

Where did this come from? Adding values anywhere except on the end of
the enumeration list will be fraught with danger, as will removing them.
In essence, either operation would entail rewriting every table that
used the type. Anything else carries a major risk of corruption. That
seems like a pretty bad idea.

cheers

andrew

"Andrew Dunstan" <andrew@dunslane.net> writes:

> Where did this come from? Adding values anywhere except on the end of the
> enumeration list will be fraught with danger, as will removing them. In
> essence, either operation would entail rewriting every table that used the
> type. Anything else carries a major risk of corruption. That seems like a
> pretty bad idea.

The TODO doesn't say anything about there not being restrictions. Only being
able to add to the end seems like a likely such restriction.

And removing entries is "only" an engineering problem where you have to go out
and check that there are no records referencing that entry.

--
  Gregory Stark
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