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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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52
contrib/btree_gist/btree_float8.c
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@ -17,6 +17,7 @@ PG_FUNCTION_INFO_V1(gbt_float8_compress);
PG_FUNCTION_INFO_V1(gbt_float8_union);
PG_FUNCTION_INFO_V1(gbt_float8_picksplit);
PG_FUNCTION_INFO_V1(gbt_float8_consistent);
PG_FUNCTION_INFO_V1(gbt_float8_distance);
PG_FUNCTION_INFO_V1(gbt_float8_penalty);
PG_FUNCTION_INFO_V1(gbt_float8_same);
@ -24,6 +25,7 @@ Datum gbt_float8_compress(PG_FUNCTION_ARGS);
Datum gbt_float8_union(PG_FUNCTION_ARGS);
Datum gbt_float8_picksplit(PG_FUNCTION_ARGS);
Datum gbt_float8_consistent(PG_FUNCTION_ARGS);
Datum gbt_float8_distance(PG_FUNCTION_ARGS);
Datum gbt_float8_penalty(PG_FUNCTION_ARGS);
Datum gbt_float8_same(PG_FUNCTION_ARGS);
@ -71,6 +73,19 @@ gbt_float8key_cmp(const void *a, const void *b)
return (ia->lower > ib->lower) ? 1 : -1;
}
static float8
gbt_float8_dist(const void *a, const void *b)
{
float8 arg1 = *(const float8 *)a;
float8 arg2 = *(const float8 *)b;
float8 r;
r = arg1 - arg2;
CHECKFLOATVAL(r, isinf(arg1) || isinf(arg2), true);
return Abs(r);
}
static const gbtree_ninfo tinfo =
{
@ -81,10 +96,26 @@ static const gbtree_ninfo tinfo =
gbt_float8eq,
gbt_float8le,
gbt_float8lt,
gbt_float8key_cmp
gbt_float8key_cmp,
gbt_float8_dist
};
PG_FUNCTION_INFO_V1(float8_dist);
Datum float8_dist(PG_FUNCTION_ARGS);
Datum
float8_dist(PG_FUNCTION_ARGS)
{
float8 a = PG_GETARG_FLOAT8(0);
float8 b = PG_GETARG_FLOAT8(1);
float8 r;
r = a - b;
CHECKFLOATVAL(r, isinf(a) || isinf(b), true);
PG_RETURN_FLOAT8( Abs(r) );
}
/**************************************************
* float8 ops
**************************************************/
@ -124,6 +155,25 @@ gbt_float8_consistent(PG_FUNCTION_ARGS)
}
Datum
gbt_float8_distance(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
float8 query = PG_GETARG_FLOAT8(1);
/* Oid subtype = PG_GETARG_OID(3); */
float8KEY *kkk = (float8KEY *) 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_float8_union(PG_FUNCTION_ARGS)
{