| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
| Cc: | Pavel Stehule <stehule(at)kix(dot)fsv(dot)cvut(dot)cz>, pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: patch for between symmetric, asymmetric (from TODO) |
| Date: | 2005-06-01 15:34:20 |
| Message-ID: | 14357.1117640060@sss.pgh.pa.us |
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| Lists: | pgsql-patches |
Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> Pavel Stehule wrote:
>> I did task from TODO: Add BETWEEN ASYMMETRIC/SYMMETRIC.
> The implementation in this patch has the same problems as all the
> previously rejected attempts: it evaluates its arguments twice. You
> need to make BETWEEN SYMMETRIC into a separate node type that evaluates
> each argument only once.
Sure, but BETWEEN already does that; Pavel's not making that situation
any worse. The trouble with making it a separate node type is that that
raises the stakes a great deal concerning the amount of planner support
needed (assuming you still want indexability...)
regards, tom lane
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