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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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46
contrib/btree_gist/btree_float4.c
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@ -17,6 +17,7 @@ PG_FUNCTION_INFO_V1(gbt_float4_compress);
PG_FUNCTION_INFO_V1(gbt_float4_union);
PG_FUNCTION_INFO_V1(gbt_float4_picksplit);
PG_FUNCTION_INFO_V1(gbt_float4_consistent);
PG_FUNCTION_INFO_V1(gbt_float4_distance);
PG_FUNCTION_INFO_V1(gbt_float4_penalty);
PG_FUNCTION_INFO_V1(gbt_float4_same);
@ -24,6 +25,7 @@ Datum gbt_float4_compress(PG_FUNCTION_ARGS);
Datum gbt_float4_union(PG_FUNCTION_ARGS);
Datum gbt_float4_picksplit(PG_FUNCTION_ARGS);
Datum gbt_float4_consistent(PG_FUNCTION_ARGS);
Datum gbt_float4_distance(PG_FUNCTION_ARGS);
Datum gbt_float4_penalty(PG_FUNCTION_ARGS);
Datum gbt_float4_same(PG_FUNCTION_ARGS);
@ -70,6 +72,12 @@ gbt_float4key_cmp(const void *a, const void *b)
return (ia->lower > ib->lower) ? 1 : -1;
}
static float8
gbt_float4_dist(const void *a, const void *b)
{
return GET_FLOAT_DISTANCE(float4, a, b);
}
static const gbtree_ninfo tinfo =
{
@ -80,10 +88,27 @@ static const gbtree_ninfo tinfo =
gbt_float4eq,
gbt_float4le,
gbt_float4lt,
gbt_float4key_cmp
gbt_float4key_cmp,
gbt_float4_dist
};
PG_FUNCTION_INFO_V1(float4_dist);
Datum float4_dist(PG_FUNCTION_ARGS);
Datum
float4_dist(PG_FUNCTION_ARGS)
{
float4 a = PG_GETARG_FLOAT4(0);
float4 b = PG_GETARG_FLOAT4(1);
float4 r;
r = a - b;
CHECKFLOATVAL(r, isinf(a) || isinf(b), true);
PG_RETURN_FLOAT4( Abs(r) );
}
/**************************************************
* float4 ops
**************************************************/
@ -123,6 +148,25 @@ gbt_float4_consistent(PG_FUNCTION_ARGS)
}
Datum
gbt_float4_distance(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
float4 query = PG_GETARG_FLOAT4(1);
/* Oid subtype = PG_GETARG_OID(3); */
float4KEY *kkk = (float4KEY *) 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_float4_union(PG_FUNCTION_ARGS)
{