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PostgreSQL/contrib/btree_gin/btree_gin.c

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/*
* contrib/btree_gin/btree_gin.c
*/
#include "postgres.h"
#include <limits.h>
#include "access/skey.h"
#include "utils/builtins.h"
#include "utils/bytea.h"
#include "utils/cash.h"
#include "utils/date.h"
#include "utils/inet.h"
#include "utils/numeric.h"
#include "utils/timestamp.h"
#include "utils/varbit.h"
PG_MODULE_MAGIC;
typedef struct TypeInfo
{
bool is_varlena;
Datum (*leftmostvalue) (void);
Datum (*typecmp) (FunctionCallInfo);
} TypeInfo;
typedef struct QueryInfo
{
StrategyNumber strategy;
Datum datum;
} QueryInfo;
#define GIN_EXTRACT_VALUE(type) \
PG_FUNCTION_INFO_V1(gin_extract_value_##type); \
Datum gin_extract_value_##type(PG_FUNCTION_ARGS); \
Datum \
gin_extract_value_##type(PG_FUNCTION_ARGS) \
{ \
Datum datum = PG_GETARG_DATUM(0); \
int32 *nentries = (int32 *) PG_GETARG_POINTER(1); \
Datum *entries = (Datum *) palloc(sizeof(Datum)); \
\
if ( TypeInfo_##type.is_varlena ) \
datum = PointerGetDatum(PG_DETOAST_DATUM(datum)); \
entries[0] = datum; \
*nentries = 1; \
\
PG_RETURN_POINTER(entries); \
}
/*
* For BTGreaterEqualStrategyNumber, BTGreaterStrategyNumber, and
* BTEqualStrategyNumber we want to start the index scan at the
* supplied query datum, and work forward. For BTLessStrategyNumber
* and BTLessEqualStrategyNumber, we need to start at the leftmost
* key, and work forward until the supplied query datum (which must be
* sent along inside the QueryInfo structure).
*/
#define GIN_EXTRACT_QUERY(type) \
PG_FUNCTION_INFO_V1(gin_extract_query_##type); \
Datum gin_extract_query_##type(PG_FUNCTION_ARGS); \
Datum \
gin_extract_query_##type(PG_FUNCTION_ARGS) \
{ \
Datum datum = PG_GETARG_DATUM(0); \
int32 *nentries = (int32 *) PG_GETARG_POINTER(1); \
StrategyNumber strategy = PG_GETARG_UINT16(2); \
bool **partialmatch = (bool **) PG_GETARG_POINTER(3); \
Pointer **extra_data = (Pointer **) PG_GETARG_POINTER(4); \
Datum *entries = (Datum *) palloc(sizeof(Datum)); \
QueryInfo *data = (QueryInfo *) palloc(sizeof(QueryInfo)); \
bool *ptr_partialmatch; \
\
*nentries = 1; \
ptr_partialmatch = *partialmatch = (bool *) palloc(sizeof(bool)); \
*ptr_partialmatch = false; \
if ( TypeInfo_##type.is_varlena ) \
datum = PointerGetDatum(PG_DETOAST_DATUM(datum)); \
data->strategy = strategy; \
data->datum = datum; \
*extra_data = (Pointer *) palloc(sizeof(Pointer)); \
**extra_data = (Pointer) data; \
\
switch (strategy) \
{ \
case BTLessStrategyNumber: \
case BTLessEqualStrategyNumber: \
entries[0] = TypeInfo_##type.leftmostvalue(); \
*ptr_partialmatch = true; \
break; \
case BTGreaterEqualStrategyNumber: \
case BTGreaterStrategyNumber: \
*ptr_partialmatch = true; \
case BTEqualStrategyNumber: \
entries[0] = datum; \
break; \
default: \
elog(ERROR, "unrecognized strategy number: %d", strategy); \
} \
\
PG_RETURN_POINTER(entries); \
}
/*
* Datum a is a value from extract_query method and for BTLess*
* strategy it is a left-most value. So, use original datum from QueryInfo
* to decide to stop scanning or not. Datum b is always from index.
*/
#define GIN_COMPARE_PREFIX(type) \
PG_FUNCTION_INFO_V1(gin_compare_prefix_##type); \
Datum gin_compare_prefix_##type(PG_FUNCTION_ARGS); \
Datum \
gin_compare_prefix_##type(PG_FUNCTION_ARGS) \
{ \
Datum a = PG_GETARG_DATUM(0); \
Datum b = PG_GETARG_DATUM(1); \
QueryInfo *data = (QueryInfo *) PG_GETARG_POINTER(3); \
int32 res, \
cmp; \
\
cmp = DatumGetInt32(DirectFunctionCall2Coll( \
TypeInfo_##type.typecmp, \
PG_GET_COLLATION(), \
(data->strategy == BTLessStrategyNumber || \
data->strategy == BTLessEqualStrategyNumber) \
? data->datum : a, \
b)); \
\
switch (data->strategy) \
{ \
case BTLessStrategyNumber: \
/* If original datum > indexed one then return match */ \
if (cmp > 0) \
res = 0; \
else \
res = 1; \
break; \
case BTLessEqualStrategyNumber: \
/* The same except equality */ \
if (cmp >= 0) \
res = 0; \
else \
res = 1; \
break; \
case BTEqualStrategyNumber: \
if (cmp != 0) \
res = 1; \
else \
res = 0; \
break; \
case BTGreaterEqualStrategyNumber: \
/* If original datum <= indexed one then return match */ \
if (cmp <= 0) \
res = 0; \
else \
res = 1; \
break; \
case BTGreaterStrategyNumber: \
/* If original datum <= indexed one then return match */ \
/* If original datum == indexed one then continue scan */ \
if (cmp < 0) \
res = 0; \
else if (cmp == 0) \
res = -1; \
else \
res = 1; \
break; \
default: \
elog(ERROR, "unrecognized strategy number: %d", \
data->strategy); \
res = 0; \
} \
\
PG_RETURN_INT32(res); \
}
#define GIN_SUPPORT(type) \
GIN_EXTRACT_VALUE(type) \
GIN_EXTRACT_QUERY(type) \
GIN_COMPARE_PREFIX(type)
PG_FUNCTION_INFO_V1(gin_btree_consistent);
Datum gin_btree_consistent(PG_FUNCTION_ARGS);
Datum
gin_btree_consistent(PG_FUNCTION_ARGS)
{
bool *recheck = (bool *) PG_GETARG_POINTER(5);
*recheck = false;
PG_RETURN_BOOL(true);
}
static Datum
leftmostvalue_int2(void)
{
return Int16GetDatum(SHRT_MIN);
}
static TypeInfo TypeInfo_int2 = {false, leftmostvalue_int2, btint2cmp};
GIN_SUPPORT(int2)
static Datum
leftmostvalue_int4(void)
{
return Int32GetDatum(INT_MIN);
}
static TypeInfo TypeInfo_int4 = {false, leftmostvalue_int4, btint4cmp};
GIN_SUPPORT(int4)
static Datum
leftmostvalue_int8(void)
{
/*
* Use sequence's definition to keep compatibility.
*/
return Int64GetDatum(SEQ_MINVALUE);
}
static TypeInfo TypeInfo_int8 = {false, leftmostvalue_int8, btint8cmp};
GIN_SUPPORT(int8)
static Datum
leftmostvalue_float4(void)
{
return Float4GetDatum(-get_float4_infinity());
}
static TypeInfo TypeInfo_float4 = {false, leftmostvalue_float4, btfloat4cmp};
GIN_SUPPORT(float4)
static Datum
leftmostvalue_float8(void)
{
return Float8GetDatum(-get_float8_infinity());
}
static TypeInfo TypeInfo_float8 = {false, leftmostvalue_float8, btfloat8cmp};
GIN_SUPPORT(float8)
static Datum
leftmostvalue_money(void)
{
/*
* Use sequence's definition to keep compatibility.
*/
return Int64GetDatum(SEQ_MINVALUE);
}
static TypeInfo TypeInfo_money = {false, leftmostvalue_money, cash_cmp};
GIN_SUPPORT(money)
static Datum
leftmostvalue_oid(void)
{
return ObjectIdGetDatum(0);
}
static TypeInfo TypeInfo_oid = {false, leftmostvalue_oid, btoidcmp};
GIN_SUPPORT(oid)
static Datum
leftmostvalue_timestamp(void)
{
return TimestampGetDatum(DT_NOBEGIN);
}
static TypeInfo TypeInfo_timestamp = {false, leftmostvalue_timestamp, timestamp_cmp};
GIN_SUPPORT(timestamp)
static TypeInfo TypeInfo_timestamptz = {false, leftmostvalue_timestamp, timestamp_cmp};
GIN_SUPPORT(timestamptz)
static Datum
leftmostvalue_time(void)
{
return TimeADTGetDatum(0);
}
static TypeInfo TypeInfo_time = {false, leftmostvalue_time, time_cmp};
GIN_SUPPORT(time)
static Datum
leftmostvalue_timetz(void)
{
TimeTzADT *v = palloc(sizeof(TimeTzADT));
v->time = 0;
v->zone = -24 * 3600; /* XXX is that true? */
return TimeTzADTPGetDatum(v);
}
static TypeInfo TypeInfo_timetz = {false, leftmostvalue_timetz, timetz_cmp};
GIN_SUPPORT(timetz)
static Datum
leftmostvalue_date(void)
{
return DateADTGetDatum(DATEVAL_NOBEGIN);
}
static TypeInfo TypeInfo_date = {false, leftmostvalue_date, date_cmp};
GIN_SUPPORT(date)
static Datum
leftmostvalue_interval(void)
{
Interval *v = palloc(sizeof(Interval));
v->time = DT_NOBEGIN;
v->day = 0;
v->month = 0;
return IntervalPGetDatum(v);
}
static TypeInfo TypeInfo_interval = {false, leftmostvalue_interval, interval_cmp};
GIN_SUPPORT(interval)
static Datum
leftmostvalue_macaddr(void)
{
macaddr *v = palloc0(sizeof(macaddr));
return MacaddrPGetDatum(v);
}
static TypeInfo TypeInfo_macaddr = {false, leftmostvalue_macaddr, macaddr_cmp};
GIN_SUPPORT(macaddr)
static Datum
leftmostvalue_inet(void)
{
return DirectFunctionCall3(inet_in,
CStringGetDatum("0.0.0.0/0"),
ObjectIdGetDatum(0),
Int32GetDatum(-1));
}
static TypeInfo TypeInfo_inet = {true, leftmostvalue_inet, network_cmp};
GIN_SUPPORT(inet)
static TypeInfo TypeInfo_cidr = {true, leftmostvalue_inet, network_cmp};
GIN_SUPPORT(cidr)
static Datum
leftmostvalue_text(void)
{
return PointerGetDatum(cstring_to_text_with_len("", 0));
}
static TypeInfo TypeInfo_text = {true, leftmostvalue_text, bttextcmp};
GIN_SUPPORT(text)
static Datum
leftmostvalue_char(void)
{
return CharGetDatum(SCHAR_MIN);
}
static TypeInfo TypeInfo_char = {false, leftmostvalue_char, btcharcmp};
GIN_SUPPORT(char)
static TypeInfo TypeInfo_bytea = {true, leftmostvalue_text, byteacmp};
GIN_SUPPORT(bytea)
static Datum
leftmostvalue_bit(void)
{
return DirectFunctionCall3(bit_in,
CStringGetDatum(""),
ObjectIdGetDatum(0),
Int32GetDatum(-1));
}
static TypeInfo TypeInfo_bit = {true, leftmostvalue_bit, bitcmp};
GIN_SUPPORT(bit)
static Datum
leftmostvalue_varbit(void)
{
return DirectFunctionCall3(varbit_in,
CStringGetDatum(""),
ObjectIdGetDatum(0),
Int32GetDatum(-1));
}
static TypeInfo TypeInfo_varbit = {true, leftmostvalue_varbit, bitcmp};
GIN_SUPPORT(varbit)
/*
* Numeric type hasn't a real left-most value, so we use PointerGetDatum(NULL)
* (*not* a SQL NULL) to represent that. We can get away with that because
* the value returned by our leftmostvalue function will never be stored in
* the index nor passed to anything except our compare and prefix-comparison
* functions. The same trick could be used for other pass-by-reference types.
*/
#define NUMERIC_IS_LEFTMOST(x) ((x) == NULL)
PG_FUNCTION_INFO_V1(gin_numeric_cmp);
Datum gin_numeric_cmp(PG_FUNCTION_ARGS);
Datum
gin_numeric_cmp(PG_FUNCTION_ARGS)
{
Numeric a = (Numeric) PG_GETARG_POINTER(0);
Numeric b = (Numeric) PG_GETARG_POINTER(1);
int res = 0;
if (NUMERIC_IS_LEFTMOST(a))
{
res = (NUMERIC_IS_LEFTMOST(b)) ? 0 : -1;
}
else if (NUMERIC_IS_LEFTMOST(b))
{
res = 1;
}
else
{
res = DatumGetInt32(DirectFunctionCall2(numeric_cmp,
NumericGetDatum(a),
NumericGetDatum(b)));
}
PG_RETURN_INT32(res);
}
static Datum
leftmostvalue_numeric(void)
{
return PointerGetDatum(NULL);
}
static TypeInfo TypeInfo_numeric = {true, leftmostvalue_numeric, gin_numeric_cmp};
GIN_SUPPORT(numeric)
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