Re: [HACKERS] Revised proposal for libpq and FE/BE protocol changes

> 2. The RowDescription ('T') message is extended by adding a new value
> for each field. Just after the type-size value, there will now be
> an int16 "atttypmod" value. (Would someone provide text specifying
> exactly what this value means?) libpq will store this value in
> a new "adtmod" field of PGresAttDesc structs.

>From src/include/catalog/pg_attribute.h:

/*
* atttypmod records type-specific modifications supplied at table
* creation time, and passes it to input and output functions as the
* third argument.
*/

Currently only used for char() and varchar(), and includes a 4-byte
header.

--
Bruce Momjian | 830 Blythe Avenue
maillist(at)candle(dot)pha(dot)pa(dot)us | Drexel Hill, Pennsylvania 19026
+ If your life is a hard drive, | (610) 353-9879(w)
+ Christ can be your backup. | (610) 853-3000(h)