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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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49
contrib/btree_gist/btree_int2.c
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@ -17,6 +17,7 @@ PG_FUNCTION_INFO_V1(gbt_int2_compress);
PG_FUNCTION_INFO_V1(gbt_int2_union);
PG_FUNCTION_INFO_V1(gbt_int2_picksplit);
PG_FUNCTION_INFO_V1(gbt_int2_consistent);
PG_FUNCTION_INFO_V1(gbt_int2_distance);
PG_FUNCTION_INFO_V1(gbt_int2_penalty);
PG_FUNCTION_INFO_V1(gbt_int2_same);
@ -24,6 +25,7 @@ Datum gbt_int2_compress(PG_FUNCTION_ARGS);
Datum gbt_int2_union(PG_FUNCTION_ARGS);
Datum gbt_int2_picksplit(PG_FUNCTION_ARGS);
Datum gbt_int2_consistent(PG_FUNCTION_ARGS);
Datum gbt_int2_distance(PG_FUNCTION_ARGS);
Datum gbt_int2_penalty(PG_FUNCTION_ARGS);
Datum gbt_int2_same(PG_FUNCTION_ARGS);
@ -70,6 +72,12 @@ gbt_int2key_cmp(const void *a, const void *b)
return (ia->lower > ib->lower) ? 1 : -1;
}
static float8
gbt_int2_dist(const void *a, const void *b)
{
return GET_FLOAT_DISTANCE(int2, a, b);
}
static const gbtree_ninfo tinfo =
{
@ -80,12 +88,32 @@ static const gbtree_ninfo tinfo =
gbt_int2eq,
gbt_int2le,
gbt_int2lt,
gbt_int2key_cmp
gbt_int2key_cmp,
gbt_int2_dist
};
PG_FUNCTION_INFO_V1(int2_dist);
Datum int2_dist(PG_FUNCTION_ARGS);
Datum
int2_dist(PG_FUNCTION_ARGS)
{
int2 a = PG_GETARG_INT16(0);
int2 b = PG_GETARG_INT16(1);
int2 r;
int2 ra;
r = a - b;
ra = Abs(r);
/* Overflow check. */
if (ra < 0 || (!SAMESIGN(a, b) && !SAMESIGN(r, a)))
ereport(ERROR,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("smallint out of range")));
PG_RETURN_INT16(ra);
}
/**************************************************
@ -127,6 +155,25 @@ gbt_int2_consistent(PG_FUNCTION_ARGS)
}
Datum
gbt_int2_distance(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
int16 query = PG_GETARG_INT16(1);
/* Oid subtype = PG_GETARG_OID(3); */
int16KEY *kkk = (int16KEY *) 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_int2_union(PG_FUNCTION_ARGS)
{