Message-ID: <4C12050A.5060100@enterprisedb.com>
Date: Fri, 11 Jun 2010 12:42:34 +0300
From: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Organization: EnterpriseDB
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To: David Jarvis <thangalin@gmail.com>
CC: pgsql-performance@postgresql.org
Subject: Re: Analysis Function
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On 11/06/10 11:25, David Jarvis wrote:
> Datum dateserial (PG_FUNCTION_ARGS) {
>    int32 p_year = PG_GETARG_INT32(0);
>    int32 p_month = PG_GETARG_INT32(1);
>    int32 p_day = PG_GETARG_INT32(2);
>
>    DateADT d = date2j (p_year, p_month, p_day) - POSTGRES_EPOCH_JDATE;
>    PG_RETURN_DATEADT(d);
> }
>
> Compiles without errors or warnings. The function is integrated as follows:
>
> CREATE OR REPLACE FUNCTION dateserial(integer, integer, integer)
>    RETURNS text AS
> 'ymd.so', 'dateserial'
>    LANGUAGE 'c' IMMUTABLE STRICT
>    COST 1;
>
> However, when I try to use it, the database segfaults:
>
> select dateserial( 2007, 1, 3 )
>
> Any ideas why?

The C function returns a DateADT, which is a typedef for int32, but the 
CREATE FUNCTION statement claims that it returns 'text'.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com