| Lists: | pgsql-hackers |
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| From: | Dave Cramer <pg(at)fastcrypt(dot)com> |
|---|---|
| To: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | processing of unknown datatype |
| Date: | 2004-01-06 23:14:04 |
| Message-ID: | 1073430844.1946.166.camel@localhost.localdomain |
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| Lists: | pgsql-hackers |
How does the unknown data type get processed, there doesn't seem to be
any casts for it?
I have a function expecting a timestamp, cstring, cstring
if I pass it a timestamp, unknown, unkown it works?
if I pass it an unknown, unknown, unkown, it can't be found?
Dave
--
Dave Cramer
519 939 0336
ICQ # 1467551
| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | pg(at)fastcrypt(dot)com |
| Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: processing of unknown datatype |
| Date: | 2004-01-07 00:47:25 |
| Message-ID: | 14021.1073436445@sss.pgh.pa.us |
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Dave Cramer <pg(at)fastcrypt(dot)com> writes:
> I have a function expecting a timestamp, cstring, cstring
> if I pass it a timestamp, unknown, unkown it works?
> if I pass it an unknown, unknown, unkown, it can't be found?
You sure it's "can't find it" and not "can't choose among multiple
functions of that name"?
regards, tom lane
| From: | Dave Cramer <pg(at)fastcrypt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: processing of unknown datatype |
| Date: | 2004-01-07 02:31:51 |
| Message-ID: | 1073442711.1671.169.camel@localhost.localdomain |
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You are correct, it can't choose
Dave
On Tue, 2004-01-06 at 19:47, Tom Lane wrote:
> Dave Cramer <pg(at)fastcrypt(dot)com> writes:
> > I have a function expecting a timestamp, cstring, cstring
> > if I pass it a timestamp, unknown, unkown it works?
> > if I pass it an unknown, unknown, unkown, it can't be found?
>
> You sure it's "can't find it" and not "can't choose among multiple
> functions of that name"?
>
> regards, tom lane
>
--
Dave Cramer
519 939 0336
ICQ # 1467551
| From: | Dave Cramer <pg(at)fastcrypt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: processing of unknown datatype |
| Date: | 2004-01-07 03:46:10 |
| Message-ID: | 1073447170.1671.175.camel@localhost.localdomain |
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| Lists: | pgsql-hackers |
So how can I create a function that it will choose, the option of
casting is not available to me
Dave
On Tue, 2004-01-06 at 19:47, Tom Lane wrote:
> Dave Cramer <pg(at)fastcrypt(dot)com> writes:
> > I have a function expecting a timestamp, cstring, cstring
> > if I pass it a timestamp, unknown, unkown it works?
> > if I pass it an unknown, unknown, unkown, it can't be found?
>
> You sure it's "can't find it" and not "can't choose among multiple
> functions of that name"?
>
> regards, tom lane
>
> ---------------------------(end of broadcast)---------------------------
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> http://archives.postgresql.org
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--
Dave Cramer
519 939 0336
ICQ # 1467551
| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | pg(at)fastcrypt(dot)com |
| Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: processing of unknown datatype |
| Date: | 2004-01-07 04:12:20 |
| Message-ID: | 14839.1073448740@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Dave Cramer <pg(at)fastcrypt(dot)com> writes:
> So how can I create a function that it will choose, the option of
> casting is not available to me
If the inputs are all unknown, I think your only choice is to not have
more than one function of that name (and number of parameters).
Otherwise the system simply doesn't have a basis for making a choice.
regards, tom lane