postgresql/contrib/btree_gist/btree_text.c
Teodor Sigaev 1f7ef548ec Changes
* new split algorithm (as proposed in http://archives.postgresql.org/pgsql-hackers/2006-06/msg00254.php)
  * possible call pickSplit() for second and below columns
  * add spl_(l|r)datum_exists to GIST_SPLITVEC -
    pickSplit should check its values to use already defined
    spl_(l|r)datum for splitting. pickSplit should set
    spl_(l|r)datum_exists to 'false' (if they was 'true') to
    signal to caller about using spl_(l|r)datum.
  * support for old pickSplit(): not very optimal
    but correct split
* remove 'bytes' field from GISTENTRY: in any case size of
  value is defined by it's type.
* split GIST_SPLITVEC to two structures: one for using in picksplit
  and second - for internal use.
* some code refactoring
* support of subsplit to rtree opclasses

TODO: add support of subsplit to contrib modules
2006-06-28 12:00:14 +00:00

211 lines
4.8 KiB
C

#include "btree_gist.h"
#include "btree_utils_var.h"
#include "utils/builtins.h"
/*
** Text ops
*/
PG_FUNCTION_INFO_V1(gbt_text_compress);
PG_FUNCTION_INFO_V1(gbt_bpchar_compress);
PG_FUNCTION_INFO_V1(gbt_text_union);
PG_FUNCTION_INFO_V1(gbt_text_picksplit);
PG_FUNCTION_INFO_V1(gbt_text_consistent);
PG_FUNCTION_INFO_V1(gbt_bpchar_consistent);
PG_FUNCTION_INFO_V1(gbt_text_penalty);
PG_FUNCTION_INFO_V1(gbt_text_same);
Datum gbt_text_compress(PG_FUNCTION_ARGS);
Datum gbt_bpchar_compress(PG_FUNCTION_ARGS);
Datum gbt_text_union(PG_FUNCTION_ARGS);
Datum gbt_text_picksplit(PG_FUNCTION_ARGS);
Datum gbt_text_consistent(PG_FUNCTION_ARGS);
Datum gbt_bpchar_consistent(PG_FUNCTION_ARGS);
Datum gbt_text_penalty(PG_FUNCTION_ARGS);
Datum gbt_text_same(PG_FUNCTION_ARGS);
/* define for comparison */
static bool
gbt_textgt(const void *a, const void *b)
{
return (DatumGetBool(DirectFunctionCall2(text_gt, PointerGetDatum(a), PointerGetDatum(b))));
}
static bool
gbt_textge(const void *a, const void *b)
{
return (DatumGetBool(DirectFunctionCall2(text_ge, PointerGetDatum(a), PointerGetDatum(b))));
}
static bool
gbt_texteq(const void *a, const void *b)
{
return (DatumGetBool(DirectFunctionCall2(texteq, PointerGetDatum(a), PointerGetDatum(b))));
}
static bool
gbt_textle(const void *a, const void *b)
{
return (DatumGetBool(DirectFunctionCall2(text_le, PointerGetDatum(a), PointerGetDatum(b))));
}
static bool
gbt_textlt(const void *a, const void *b)
{
return (DatumGetBool(DirectFunctionCall2(text_lt, PointerGetDatum(a), PointerGetDatum(b))));
}
static int32
gbt_textcmp(const bytea *a, const bytea *b)
{
return DatumGetInt32(DirectFunctionCall2(bttextcmp, PointerGetDatum(a), PointerGetDatum(b)));
}
static gbtree_vinfo tinfo =
{
gbt_t_text,
0,
FALSE,
gbt_textgt,
gbt_textge,
gbt_texteq,
gbt_textle,
gbt_textlt,
gbt_textcmp,
NULL
};
/**************************************************
* Text ops
**************************************************/
Datum
gbt_text_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
if (tinfo.eml == 0)
{
tinfo.eml = pg_database_encoding_max_length();
}
PG_RETURN_POINTER(gbt_var_compress(entry, &tinfo));
}
Datum
gbt_bpchar_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval;
if (tinfo.eml == 0)
{
tinfo.eml = pg_database_encoding_max_length();
}
if (entry->leafkey)
{
Datum d = DirectFunctionCall1(rtrim1, entry->key);
GISTENTRY trim;
gistentryinit(trim, d,
entry->rel, entry->page,
entry->offset, TRUE);
retval = gbt_var_compress(&trim, &tinfo);
}
else
retval = entry;
PG_RETURN_POINTER(retval);
}
Datum
gbt_text_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GBT_VARKEY *key = (GBT_VARKEY *) DatumGetPointer(entry->key);
void *query = (void *) DatumGetTextP(PG_GETARG_DATUM(1));
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
bool retval = FALSE;
GBT_VARKEY_R r = gbt_var_key_readable(key);
if (tinfo.eml == 0)
{
tinfo.eml = pg_database_encoding_max_length();
}
retval = gbt_var_consistent(&r, query, &strategy, GIST_LEAF(entry), &tinfo);
PG_RETURN_BOOL(retval);
}
Datum
gbt_bpchar_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GBT_VARKEY *key = (GBT_VARKEY *) DatumGetPointer(entry->key);
void *query = (void *) DatumGetPointer(PG_DETOAST_DATUM(PG_GETARG_DATUM(1)));
void *trim = (void *) DatumGetPointer(DirectFunctionCall1(rtrim1, PointerGetDatum(query)));
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
bool retval;
GBT_VARKEY_R r = gbt_var_key_readable(key);
if (tinfo.eml == 0)
{
tinfo.eml = pg_database_encoding_max_length();
}
retval = gbt_var_consistent(&r, trim, &strategy, GIST_LEAF(entry), &tinfo);
PG_RETURN_BOOL(retval);
}
Datum
gbt_text_union(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
int32 *size = (int *) PG_GETARG_POINTER(1);
PG_RETURN_POINTER(gbt_var_union(entryvec, size, &tinfo));
}
Datum
gbt_text_picksplit(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
gbt_var_picksplit(entryvec, v, &tinfo);
PG_RETURN_POINTER(v);
}
Datum
gbt_text_same(PG_FUNCTION_ARGS)
{
Datum d1 = PG_GETARG_DATUM(0);
Datum d2 = PG_GETARG_DATUM(1);
bool *result = (bool *) PG_GETARG_POINTER(2);
PG_RETURN_POINTER(gbt_var_same(result, d1, d2, &tinfo));
}
Datum
gbt_text_penalty(PG_FUNCTION_ARGS)
{
GISTENTRY *o = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *n = (GISTENTRY *) PG_GETARG_POINTER(1);
float *result = (float *) PG_GETARG_POINTER(2);
PG_RETURN_POINTER(gbt_var_penalty(result, o, n, &tinfo));
}