Re: [HACKERS] vlen in libpq using user defined data type

> I have come across a situation with 6.4 which has rendered at least some
> of my home made data types unusable. Specifically, the data type,
> accntnum, is a General Ledger account number type. (i.e. 9999-99
> format) It is stored internally as an 4 byte integer; it is used
> externally as a string and passed by reference internally. An IP data
> type may be handled in a similar way. I had no problems at 6.3.2.
>
> Anyway, as pqlib reads the string sent to it by the backend (a la psql),
> it must first read the length of each string. The problem is that the
> length of the string for accntnum in some outrageously large number
> which ultimately hangs psql. BTW, atttypemod = -1 and typlen = 4 in
> the FE.
>
> Did something changed in the way a string is constructed on the BE
> before sending to the FE to cause this?
>
> Have the basic semantics changed (intentionally or unintentionally) for
> the establishment of data types?

Just reported today by another user. Tom Lane is working on this.

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