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Add KNNGIST support to contrib/btree_gist.

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

View File

@ -18,6 +18,7 @@ PG_FUNCTION_INFO_V1(gbt_date_compress);
PG_FUNCTION_INFO_V1(gbt_date_union);
PG_FUNCTION_INFO_V1(gbt_date_picksplit);
PG_FUNCTION_INFO_V1(gbt_date_consistent);
PG_FUNCTION_INFO_V1(gbt_date_distance);
PG_FUNCTION_INFO_V1(gbt_date_penalty);
PG_FUNCTION_INFO_V1(gbt_date_same);
@ -25,6 +26,7 @@ Datum gbt_date_compress(PG_FUNCTION_ARGS);
Datum gbt_date_union(PG_FUNCTION_ARGS);
Datum gbt_date_picksplit(PG_FUNCTION_ARGS);
Datum gbt_date_consistent(PG_FUNCTION_ARGS);
Datum gbt_date_distance(PG_FUNCTION_ARGS);
Datum gbt_date_penalty(PG_FUNCTION_ARGS);
Datum gbt_date_same(PG_FUNCTION_ARGS);
@ -84,6 +86,17 @@ gbt_datekey_cmp(const void *a, const void *b)
return res;
}
static float8
gdb_date_dist(const void *a, const void *b)
{
/* we assume the difference can't overflow */
Datum diff = DirectFunctionCall2(date_mi,
DateADTGetDatum(*((const DateADT *) a)),
DateADTGetDatum(*((const DateADT *) b)));
return (float8) Abs(DatumGetInt32(diff));
}
static const gbtree_ninfo tinfo =
{
@ -94,10 +107,25 @@ static const gbtree_ninfo tinfo =
gbt_dateeq,
gbt_datele,
gbt_datelt,
gbt_datekey_cmp
gbt_datekey_cmp,
gdb_date_dist
};
PG_FUNCTION_INFO_V1(date_dist);
Datum date_dist(PG_FUNCTION_ARGS);
Datum
date_dist(PG_FUNCTION_ARGS)
{
/* we assume the difference can't overflow */
Datum diff = DirectFunctionCall2(date_mi,
PG_GETARG_DATUM(0),
PG_GETARG_DATUM(1));
PG_RETURN_INT32(Abs(DatumGetInt32(diff)));
}
/**************************************************
* date ops
**************************************************/
@ -139,6 +167,25 @@ gbt_date_consistent(PG_FUNCTION_ARGS)
}
Datum
gbt_date_distance(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
DateADT query = PG_GETARG_DATEADT(1);
/* Oid subtype = PG_GETARG_OID(3); */
dateKEY *kkk = (dateKEY *) 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_date_union(PG_FUNCTION_ARGS)
{