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Re: Source Code Help Needed

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Vikram Kalsi <vikramkalsi(at)gmail(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Source Code Help Needed
Date: 2005-06-03 13:29:27
Message-ID: 4132.1117805367@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Vikram Kalsi <vikramkalsi(at)gmail(dot)com> writes:
> ...
> tpcd=# select s_suppkey from supplier where (s_suppkey>125 and 
> s_suppkey<128) or (s_suppkey>175 and s_suppkey<185) or (s_suppkey>200 and 
> s_suppkey<215);
> ...
> Actually, it seems all 
> the pointers in the List "indexinfo" or "infos" are pointing to the same 
> object.

Given that query, it's not too surprising that the only relevant index
for all the OR clauses would be the one on s_suppkey ... if you want to
look at *all* the indexes on the relation, you need to scan the parent
RelOptInfo's indexlist.

You didn't say what it was you hoped to accomplish, but perhaps the
technique requires a more complicated query to be of any use?

BTW, best_or_subclause_indexes (and indeed most of orindxpath.c) is
gone in CVS tip; all that code has been rewritten for 8.1.

			regards, tom lane

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