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Commit5545068

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KNNGIST, otherwise known as order-by-operator support for GIST.
This commit represents a rather heavily editorialized version ofTeodor's builtin_knngist_itself-0.8.2 and builtin_knngist_proc-0.8.1patches. I redid the opclass API to add a separate Distance methodinstead of turning the Consistent method into an illogical mess,fixed some bit-rot in the rbtree interfaces, and generally worked overthe code style and comments.There's still no non-code documentation to speak of, but I'll work onthat 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
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‎src/backend/access/gist/gist.c

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