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Add KNNGIST support to contrib/btree_gist.

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This extends GiST's support for nearest-neighbor searches to many of the
standard data types.

Teodor Sigaev
This commit is contained in:
Tom Lane
2011-03-02 14:43:24 -05:00
parent 6094c242d1
commit 8436489c81
40 changed files with 1546 additions and 59 deletions
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53
contrib/btree_gist/btree_oid.c
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@ -17,6 +17,7 @@ PG_FUNCTION_INFO_V1(gbt_oid_compress);
PG_FUNCTION_INFO_V1(gbt_oid_union);
PG_FUNCTION_INFO_V1(gbt_oid_picksplit);
PG_FUNCTION_INFO_V1(gbt_oid_consistent);
PG_FUNCTION_INFO_V1(gbt_oid_distance);
PG_FUNCTION_INFO_V1(gbt_oid_penalty);
PG_FUNCTION_INFO_V1(gbt_oid_same);
@ -24,6 +25,7 @@ Datum gbt_oid_compress(PG_FUNCTION_ARGS);
Datum gbt_oid_union(PG_FUNCTION_ARGS);
Datum gbt_oid_picksplit(PG_FUNCTION_ARGS);
Datum gbt_oid_consistent(PG_FUNCTION_ARGS);
Datum gbt_oid_distance(PG_FUNCTION_ARGS);
Datum gbt_oid_penalty(PG_FUNCTION_ARGS);
Datum gbt_oid_same(PG_FUNCTION_ARGS);
@ -71,6 +73,18 @@ gbt_oidkey_cmp(const void *a, const void *b)
return (ia->lower > ib->lower) ? 1 : -1;
}
static float8
gbt_oid_dist(const void *a, const void *b)
{
Oid aa = *(const Oid *) a;
Oid bb = *(const Oid *) b;
if (aa < bb)
return (float8) (bb - aa);
else
return (float8) (aa - bb);
}
static const gbtree_ninfo tinfo =
{
@ -81,10 +95,28 @@ static const gbtree_ninfo tinfo =
gbt_oideq,
gbt_oidle,
gbt_oidlt,
gbt_oidkey_cmp
gbt_oidkey_cmp,
gbt_oid_dist
};
PG_FUNCTION_INFO_V1(oid_dist);
Datum oid_dist(PG_FUNCTION_ARGS);
Datum
oid_dist(PG_FUNCTION_ARGS)
{
Oid a = PG_GETARG_OID(0);
Oid b = PG_GETARG_OID(1);
Oid res;
if (a < b)
res = b - a;
else
res = a - b;
PG_RETURN_OID(res);
}
/**************************************************
* Oid ops
**************************************************/
@ -124,6 +156,25 @@ gbt_oid_consistent(PG_FUNCTION_ARGS)
}
Datum
gbt_oid_distance(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
Oid query = PG_GETARG_OID(1);
/* Oid subtype = PG_GETARG_OID(3); */
oidKEY *kkk = (oidKEY *) DatumGetPointer(entry->key);
GBT_NUMKEY_R key;
key.lower = (GBT_NUMKEY *) &kkk->lower;
key.upper = (GBT_NUMKEY *) &kkk->upper;
PG_RETURN_FLOAT8(
gbt_num_distance(&key, (void *) &query, GIST_LEAF(entry), &tinfo)
);
}
Datum
gbt_oid_union(PG_FUNCTION_ARGS)
{