| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Thalis A(dot) Kalfigopoulos" <thalis(at)cs(dot)pitt(dot)edu> |
| Cc: | pgsql-general(at)postgresql(dot)org, Peter Eisentraut <peter_e(at)gmx(dot)net>, Alex Pilosov <alex(at)pilosoft(dot)com> |
| Subject: | Re: aggregate function for median calculation |
| Date: | 2001-06-21 16:47:24 |
| Message-ID: | 17112.993142044@sss.pgh.pa.us |
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| Lists: | pgsql-general |
"Thalis A. Kalfigopoulos" <thalis(at)cs(dot)pitt(dot)edu> writes:
> I worked on it so the struct state now has 3 fields: int length, int
> elem_count, int *elements. Now the issue is that the transition
> function, which I declare as strict, has a different input and state
> type (int4 and text respectively), so it requires an INITCOND. What
> should that be?
You're going to have to make your code able to start from a value that
can be represented as an INITCOND. Say, an empty string (zero length
word and nothing else). You're cheating, remember?
regards, tom lane
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