database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-30 21:42:05 +03:00
Code Activity

KNNGIST, otherwise known as order-by-operator support for GIST.

Browse Source 
This commit represents a rather heavily editorialized version of
Teodor's builtin_knngist_itself-0.8.2 and builtin_knngist_proc-0.8.1
patches.  I redid the opclass API to add a separate Distance method
instead of turning the Consistent method into an illogical mess,
fixed some bit-rot in the rbtree interfaces, and generally worked over
the code style and comments.

There's still no non-code documentation to speak of, but I'll work on
that separately.  Some contrib-module changes are also yet to come
(right now, point <-> point is the only KNN-ified operator).

Teodor Sigaev and Tom Lane
This commit is contained in:
Tom Lane
2010-12-03 20:52:18 -05:00
parent c0a4d3e051
commit 554506871b
16 changed files with 981 additions and 507 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/backend/access/gist/gist.c
View File

@ -1030,6 +1030,9 @@ gistnewroot(Relation r, Buffer buffer, IndexTuple *itup, int len, ItemPointer ke
END_CRIT_SECTION();
}
/*
* Fill a GISTSTATE with information about the index
*/
void
initGISTstate(GISTSTATE *giststate, Relation index)
{
@ -1064,6 +1067,13 @@ initGISTstate(GISTSTATE *giststate, Relation index)
fmgr_info_copy(&(giststate->equalFn[i]),
index_getprocinfo(index, i + 1, GIST_EQUAL_PROC),
CurrentMemoryContext);
/* opclasses are not required to provide a Distance method */
if (OidIsValid(index_getprocid(index, i + 1, GIST_DISTANCE_PROC)))
fmgr_info_copy(&(giststate->distanceFn[i]),
index_getprocinfo(index, i + 1, GIST_DISTANCE_PROC),
CurrentMemoryContext);
else
giststate->distanceFn[i].fn_oid = InvalidOid;
}
}