Hi, Tom, Why does:
CREATE CAST (text AS bytea) WITHOUT FUNCTION; SELECT E'C:\\something'::text::bytea; work as expected, but (with the original text->bytea cast in place): CREATE DOMAIN my_varlena AS text; CREATE CAST (my_varlena AS bytea) WITHOUT FUNCTION; SELECT E'C:\\something'::my_varlena::bytea; does not (i.e. appears to cast from the domain's base type) -- is this related to http://postgresql.1045698.n5.nabble.com/bug-non-working-casts-for-domain-td1944238.html , should it be documented? Thx, V. On Wed, Mar 16, 2011 at 12:10 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: > Bruce Momjian <br...@momjian.us> writes: >> Vlad Romascanu wrote: >>> Is there any way of casting (reinterpreting) a varchar/text field >>> containing arbitrary backslashes to bytea without making an escaped >>> copy of the varchar/text first? > >> Well, the '\\' is being converted to '\' because of the single-quotes, >> and then bytea is saying it doesn't know how to process \something. It >> sounds like you want bytea but don't want the ability to use backslash >> escapes to input the bytea values. I am unsure how to accomplish that. > > A really dangerous way is > > CREATE CAST (text AS bytea) WITHOUT FUNCTION; > > It's dangerous because it assumes more than it ought to about the > internal representation of the two types ... but for a one-shot > conversion I think it'd be all right. > > regards, tom lane > -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
