| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | Teodor Sigaev <teodor(at)sigaev(dot)ru> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Ibrar Ahmed <ibrar(dot)ahmad(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Review: B-Tree emulation for GIN |
| Date: | 2009-01-19 18:54:25 |
| Message-ID: | 1232391265.9065.5.camel@dell.linuxdev.us.dell.com |
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| Lists: | pgsql-hackers |
On Mon, 2009-01-19 at 21:41 +0300, Teodor Sigaev wrote:
> > And how does GIN handle SQL NULL values in the column? Does it index
> > them at all, or just ignore them?
> SQL NULL: GIN doesn't support it (amindexnulls/amsearchnulls == false)
> C NULL: NULL-numeric could be returned only by gin_extract_query_numeric which
> cannot be called by user directly because of internal type of argument.
> GIN doesn't do anything with values returned by gin_extract_query_numeric except
> providing they as an argument for comparing functions.
Ok, I understand now. I will look at this later.
Regards,
Jeff Davis
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