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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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57
contrib/btree_gist/btree_interval.c
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@ -20,6 +20,7 @@ PG_FUNCTION_INFO_V1(gbt_intv_decompress);
PG_FUNCTION_INFO_V1(gbt_intv_union);
PG_FUNCTION_INFO_V1(gbt_intv_picksplit);
PG_FUNCTION_INFO_V1(gbt_intv_consistent);
PG_FUNCTION_INFO_V1(gbt_intv_distance);
PG_FUNCTION_INFO_V1(gbt_intv_penalty);
PG_FUNCTION_INFO_V1(gbt_intv_same);
@ -28,6 +29,7 @@ Datum gbt_intv_decompress(PG_FUNCTION_ARGS);
Datum gbt_intv_union(PG_FUNCTION_ARGS);
Datum gbt_intv_picksplit(PG_FUNCTION_ARGS);
Datum gbt_intv_consistent(PG_FUNCTION_ARGS);
Datum gbt_intv_distance(PG_FUNCTION_ARGS);
Datum gbt_intv_penalty(PG_FUNCTION_ARGS);
Datum gbt_intv_same(PG_FUNCTION_ARGS);
@ -83,6 +85,12 @@ intr2num(const Interval *i)
return INTERVAL_TO_SEC(i);
}
static float8
gbt_intv_dist(const void *a, const void *b)
{
return (float8)Abs(intr2num((Interval*)a) - intr2num((Interval*)b));
}
/*
* INTERVALSIZE should be the actual size-on-disk of an Interval, as shown
* in pg_type. This might be less than sizeof(Interval) if the compiler
@ -99,10 +107,38 @@ static const gbtree_ninfo tinfo =
gbt_intveq,
gbt_intvle,
gbt_intvlt,
gbt_intvkey_cmp
gbt_intvkey_cmp,
gbt_intv_dist
};
Interval *
abs_interval(Interval *a)
{
static Interval zero = {0, 0, 0};
if (DatumGetBool(DirectFunctionCall2(interval_lt,
IntervalPGetDatum(a),
IntervalPGetDatum(&zero))))
a = DatumGetIntervalP(DirectFunctionCall1(interval_um,
IntervalPGetDatum(a)));
return a;
}
PG_FUNCTION_INFO_V1(interval_dist);
Datum interval_dist(PG_FUNCTION_ARGS);
Datum
interval_dist(PG_FUNCTION_ARGS)
{
Datum diff = DirectFunctionCall2(interval_mi,
PG_GETARG_DATUM(0),
PG_GETARG_DATUM(1));
PG_RETURN_INTERVAL_P(abs_interval(DatumGetIntervalP(diff)));
}
/**************************************************
* interval ops
**************************************************/
@ -190,6 +226,25 @@ gbt_intv_consistent(PG_FUNCTION_ARGS)
}
Datum
gbt_intv_distance(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
Interval *query = PG_GETARG_INTERVAL_P(1);
/* Oid subtype = PG_GETARG_OID(3); */
intvKEY *kkk = (intvKEY *) 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_intv_union(PG_FUNCTION_ARGS)
{