nbtcompare.c File Reference

#include "postgres.h"
#include <limits.h>
#include "utils/fmgrprotos.h"
#include "utils/skipsupport.h"
#include "utils/sortsupport.h"

Include dependency graph for nbtcompare.c:

Go to the source code of this file.

Macros
#define	A_LESS_THAN_B   (-1)
#define	A_GREATER_THAN_B   1

Functions
Datum	btboolcmp (PG_FUNCTION_ARGS)
static Datum	bool_decrement (Relation rel, Datum existing, bool *underflow)
static Datum	bool_increment (Relation rel, Datum existing, bool *overflow)
Datum	btboolskipsupport (PG_FUNCTION_ARGS)
Datum	btint2cmp (PG_FUNCTION_ARGS)
static int	btint2fastcmp (Datum x, Datum y, SortSupport ssup)
Datum	btint2sortsupport (PG_FUNCTION_ARGS)
static Datum	int2_decrement (Relation rel, Datum existing, bool *underflow)
static Datum	int2_increment (Relation rel, Datum existing, bool *overflow)
Datum	btint2skipsupport (PG_FUNCTION_ARGS)
Datum	btint4cmp (PG_FUNCTION_ARGS)
Datum	btint4sortsupport (PG_FUNCTION_ARGS)
static Datum	int4_decrement (Relation rel, Datum existing, bool *underflow)
static Datum	int4_increment (Relation rel, Datum existing, bool *overflow)
Datum	btint4skipsupport (PG_FUNCTION_ARGS)
Datum	btint8cmp (PG_FUNCTION_ARGS)
Datum	btint8sortsupport (PG_FUNCTION_ARGS)
static Datum	int8_decrement (Relation rel, Datum existing, bool *underflow)
static Datum	int8_increment (Relation rel, Datum existing, bool *overflow)
Datum	btint8skipsupport (PG_FUNCTION_ARGS)
Datum	btint48cmp (PG_FUNCTION_ARGS)
Datum	btint84cmp (PG_FUNCTION_ARGS)
Datum	btint24cmp (PG_FUNCTION_ARGS)
Datum	btint42cmp (PG_FUNCTION_ARGS)
Datum	btint28cmp (PG_FUNCTION_ARGS)
Datum	btint82cmp (PG_FUNCTION_ARGS)
Datum	btoidcmp (PG_FUNCTION_ARGS)
static int	btoidfastcmp (Datum x, Datum y, SortSupport ssup)
Datum	btoidsortsupport (PG_FUNCTION_ARGS)
static Datum	oid_decrement (Relation rel, Datum existing, bool *underflow)
static Datum	oid_increment (Relation rel, Datum existing, bool *overflow)
Datum	btoidskipsupport (PG_FUNCTION_ARGS)
Datum	btoidvectorcmp (PG_FUNCTION_ARGS)
Datum	btcharcmp (PG_FUNCTION_ARGS)
static Datum	char_decrement (Relation rel, Datum existing, bool *underflow)
static Datum	char_increment (Relation rel, Datum existing, bool *overflow)
Datum	btcharskipsupport (PG_FUNCTION_ARGS)

Macro Definition Documentation

A_GREATER_THAN_B

#define A_GREATER_THAN_B   1

Definition at line 69 of file nbtcompare.c.

A_LESS_THAN_B

#define A_LESS_THAN_B   (-1)

Definition at line 68 of file nbtcompare.c.

Function Documentation

bool_decrement()

static Datum bool_decrement ( Relation  rel, Datum  existing, bool *  underflow  )

static

Definition at line 83 of file nbtcompare.c.

{
    bool        bexisting = DatumGetBool(existing);
 
    if (bexisting == false)
    {
        /* return value is undefined */
        *underflow = true;
        return (Datum) 0;
    }
 
    *underflow = false;
    return BoolGetDatum(bexisting - 1);
}

References BoolGetDatum(), and DatumGetBool().

Referenced by btboolskipsupport().

bool_increment()

static Datum bool_increment ( Relation  rel, Datum  existing, bool *  overflow  )

static

Definition at line 99 of file nbtcompare.c.

{
    bool        bexisting = DatumGetBool(existing);
 
    if (bexisting == true)
    {
        /* return value is undefined */
        *overflow = true;
        return (Datum) 0;
    }
 
    *overflow = false;
    return BoolGetDatum(bexisting + 1);
}

References BoolGetDatum(), and DatumGetBool().

Referenced by btboolskipsupport().

btboolcmp()

Datum btboolcmp

(

PG_FUNCTION_ARGS

)

Definition at line 74 of file nbtcompare.c.

{
    bool        a = PG_GETARG_BOOL(0);
    bool        b = PG_GETARG_BOOL(1);
 
    PG_RETURN_INT32((int32) a - (int32) b);
}

References a, b, PG_GETARG_BOOL, and PG_RETURN_INT32.

btboolskipsupport()

Datum btboolskipsupport

(

PG_FUNCTION_ARGS

)

Definition at line 115 of file nbtcompare.c.

{
    SkipSupport sksup = (SkipSupport) PG_GETARG_POINTER(0);
 
    sksup->decrement = bool_decrement;
    sksup->increment = bool_increment;
    sksup->low_elem = BoolGetDatum(false);
    sksup->high_elem = BoolGetDatum(true);
 
    PG_RETURN_VOID();
}

References bool_decrement(), bool_increment(), BoolGetDatum(), SkipSupportData::decrement, SkipSupportData::high_elem, SkipSupportData::increment, SkipSupportData::low_elem, PG_GETARG_POINTER, and PG_RETURN_VOID.

btcharcmp()

Datum btcharcmp

(

PG_FUNCTION_ARGS

)

Definition at line 526 of file nbtcompare.c.

{
    char        a = PG_GETARG_CHAR(0);
    char        b = PG_GETARG_CHAR(1);
 
    /* Be careful to compare chars as unsigned */
    PG_RETURN_INT32((int32) ((uint8) a) - (int32) ((uint8) b));
}

References a, b, PG_GETARG_CHAR, and PG_RETURN_INT32.

btcharskipsupport()

Datum btcharskipsupport

(

PG_FUNCTION_ARGS

)

Definition at line 568 of file nbtcompare.c.

{
    SkipSupport sksup = (SkipSupport) PG_GETARG_POINTER(0);
 
    sksup->decrement = char_decrement;
    sksup->increment = char_increment;
 
    /* btcharcmp compares chars as unsigned */
    sksup->low_elem = UInt8GetDatum(0);
    sksup->high_elem = UInt8GetDatum(UCHAR_MAX);
 
    PG_RETURN_VOID();
}

References char_decrement(), char_increment(), SkipSupportData::decrement, SkipSupportData::high_elem, SkipSupportData::increment, SkipSupportData::low_elem, PG_GETARG_POINTER, PG_RETURN_VOID, and UInt8GetDatum().

btint24cmp()

Datum btint24cmp

(

PG_FUNCTION_ARGS

)

Definition at line 364 of file nbtcompare.c.

{
    int16       a = PG_GETARG_INT16(0);
    int32       b = PG_GETARG_INT32(1);
 
    if (a > b)
        PG_RETURN_INT32(A_GREATER_THAN_B);
    else if (a == b)
        PG_RETURN_INT32(0);
    else
        PG_RETURN_INT32(A_LESS_THAN_B);
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, PG_GETARG_INT16, PG_GETARG_INT32, and PG_RETURN_INT32.

btint28cmp()

Datum btint28cmp

(

PG_FUNCTION_ARGS

)

Definition at line 392 of file nbtcompare.c.

{
    int16       a = PG_GETARG_INT16(0);
    int64       b = PG_GETARG_INT64(1);
 
    if (a > b)
        PG_RETURN_INT32(A_GREATER_THAN_B);
    else if (a == b)
        PG_RETURN_INT32(0);
    else
        PG_RETURN_INT32(A_LESS_THAN_B);
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, PG_GETARG_INT16, PG_GETARG_INT64, and PG_RETURN_INT32.

btint2cmp()

Datum btint2cmp

(

PG_FUNCTION_ARGS

)

Definition at line 128 of file nbtcompare.c.

{
    int16       a = PG_GETARG_INT16(0);
    int16       b = PG_GETARG_INT16(1);
 
    PG_RETURN_INT32((int32) a - (int32) b);
}

References a, b, PG_GETARG_INT16, and PG_RETURN_INT32.

btint2fastcmp()

static int btint2fastcmp ( Datum  x, Datum  y, SortSupport  ssup  )

static

Definition at line 137 of file nbtcompare.c.

{
    int16       a = DatumGetInt16(x);
    int16       b = DatumGetInt16(y);
 
    return (int) a - (int) b;
}

References a, b, DatumGetInt16(), x, and y.

Referenced by btint2sortsupport().

btint2skipsupport()

Datum btint2skipsupport

(

PG_FUNCTION_ARGS

)

Definition at line 187 of file nbtcompare.c.

{
    SkipSupport sksup = (SkipSupport) PG_GETARG_POINTER(0);
 
    sksup->decrement = int2_decrement;
    sksup->increment = int2_increment;
    sksup->low_elem = Int16GetDatum(PG_INT16_MIN);
    sksup->high_elem = Int16GetDatum(PG_INT16_MAX);
 
    PG_RETURN_VOID();
}

References SkipSupportData::decrement, SkipSupportData::high_elem, SkipSupportData::increment, Int16GetDatum(), int2_decrement(), int2_increment(), SkipSupportData::low_elem, PG_GETARG_POINTER, PG_INT16_MAX, PG_INT16_MIN, and PG_RETURN_VOID.

btint2sortsupport()

Datum btint2sortsupport

(

PG_FUNCTION_ARGS

)

Definition at line 146 of file nbtcompare.c.

{
    SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
 
    ssup->comparator = btint2fastcmp;
    PG_RETURN_VOID();
}

References btint2fastcmp(), SortSupportData::comparator, PG_GETARG_POINTER, and PG_RETURN_VOID.

btint42cmp()

Datum btint42cmp

(

PG_FUNCTION_ARGS

)

Definition at line 378 of file nbtcompare.c.

{
    int32       a = PG_GETARG_INT32(0);
    int16       b = PG_GETARG_INT16(1);
 
    if (a > b)
        PG_RETURN_INT32(A_GREATER_THAN_B);
    else if (a == b)
        PG_RETURN_INT32(0);
    else
        PG_RETURN_INT32(A_LESS_THAN_B);
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, PG_GETARG_INT16, PG_GETARG_INT32, and PG_RETURN_INT32.

btint48cmp()

Datum btint48cmp

(

PG_FUNCTION_ARGS

)

Definition at line 336 of file nbtcompare.c.

{
    int32       a = PG_GETARG_INT32(0);
    int64       b = PG_GETARG_INT64(1);
 
    if (a > b)
        PG_RETURN_INT32(A_GREATER_THAN_B);
    else if (a == b)
        PG_RETURN_INT32(0);
    else
        PG_RETURN_INT32(A_LESS_THAN_B);
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, PG_GETARG_INT32, PG_GETARG_INT64, and PG_RETURN_INT32.

btint4cmp()

Datum btint4cmp

(

PG_FUNCTION_ARGS

)

Definition at line 200 of file nbtcompare.c.

{
    int32       a = PG_GETARG_INT32(0);
    int32       b = PG_GETARG_INT32(1);
 
    if (a > b)
        PG_RETURN_INT32(A_GREATER_THAN_B);
    else if (a == b)
        PG_RETURN_INT32(0);
    else
        PG_RETURN_INT32(A_LESS_THAN_B);
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, PG_GETARG_INT32, and PG_RETURN_INT32.

btint4skipsupport()

Datum btint4skipsupport

(

PG_FUNCTION_ARGS

)

Definition at line 255 of file nbtcompare.c.

{
    SkipSupport sksup = (SkipSupport) PG_GETARG_POINTER(0);
 
    sksup->decrement = int4_decrement;
    sksup->increment = int4_increment;
    sksup->low_elem = Int32GetDatum(PG_INT32_MIN);
    sksup->high_elem = Int32GetDatum(PG_INT32_MAX);
 
    PG_RETURN_VOID();
}

References SkipSupportData::decrement, SkipSupportData::high_elem, SkipSupportData::increment, Int32GetDatum(), int4_decrement(), int4_increment(), SkipSupportData::low_elem, PG_GETARG_POINTER, PG_INT32_MAX, PG_INT32_MIN, and PG_RETURN_VOID.

btint4sortsupport()

Datum btint4sortsupport

(

PG_FUNCTION_ARGS

)

Definition at line 214 of file nbtcompare.c.

{
    SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
 
    ssup->comparator = ssup_datum_int32_cmp;
    PG_RETURN_VOID();
}

References SortSupportData::comparator, PG_GETARG_POINTER, PG_RETURN_VOID, and ssup_datum_int32_cmp().

btint82cmp()

Datum btint82cmp

(

PG_FUNCTION_ARGS

)

Definition at line 406 of file nbtcompare.c.

{
    int64       a = PG_GETARG_INT64(0);
    int16       b = PG_GETARG_INT16(1);
 
    if (a > b)
        PG_RETURN_INT32(A_GREATER_THAN_B);
    else if (a == b)
        PG_RETURN_INT32(0);
    else
        PG_RETURN_INT32(A_LESS_THAN_B);
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, PG_GETARG_INT16, PG_GETARG_INT64, and PG_RETURN_INT32.

btint84cmp()

Datum btint84cmp

(

PG_FUNCTION_ARGS

)

Definition at line 350 of file nbtcompare.c.

{
    int64       a = PG_GETARG_INT64(0);
    int32       b = PG_GETARG_INT32(1);
 
    if (a > b)
        PG_RETURN_INT32(A_GREATER_THAN_B);
    else if (a == b)
        PG_RETURN_INT32(0);
    else
        PG_RETURN_INT32(A_LESS_THAN_B);
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, PG_GETARG_INT32, PG_GETARG_INT64, and PG_RETURN_INT32.

btint8cmp()

Datum btint8cmp

(

PG_FUNCTION_ARGS

)

Definition at line 268 of file nbtcompare.c.

{
    int64       a = PG_GETARG_INT64(0);
    int64       b = PG_GETARG_INT64(1);
 
    if (a > b)
        PG_RETURN_INT32(A_GREATER_THAN_B);
    else if (a == b)
        PG_RETURN_INT32(0);
    else
        PG_RETURN_INT32(A_LESS_THAN_B);
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, PG_GETARG_INT64, and PG_RETURN_INT32.

btint8skipsupport()

Datum btint8skipsupport

(

PG_FUNCTION_ARGS

)

Definition at line 323 of file nbtcompare.c.

{
    SkipSupport sksup = (SkipSupport) PG_GETARG_POINTER(0);
 
    sksup->decrement = int8_decrement;
    sksup->increment = int8_increment;
    sksup->low_elem = Int64GetDatum(PG_INT64_MIN);
    sksup->high_elem = Int64GetDatum(PG_INT64_MAX);
 
    PG_RETURN_VOID();
}

References SkipSupportData::decrement, SkipSupportData::high_elem, SkipSupportData::increment, Int64GetDatum(), int8_decrement(), int8_increment(), SkipSupportData::low_elem, PG_GETARG_POINTER, PG_INT64_MAX, PG_INT64_MIN, and PG_RETURN_VOID.

btint8sortsupport()

Datum btint8sortsupport

(

PG_FUNCTION_ARGS

)

Definition at line 282 of file nbtcompare.c.

{
    SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
 
    ssup->comparator = ssup_datum_signed_cmp;
    PG_RETURN_VOID();
}

References SortSupportData::comparator, PG_GETARG_POINTER, PG_RETURN_VOID, and ssup_datum_signed_cmp().

btoidcmp()

Datum btoidcmp

(

PG_FUNCTION_ARGS

)

Definition at line 420 of file nbtcompare.c.

{
    Oid         a = PG_GETARG_OID(0);
    Oid         b = PG_GETARG_OID(1);
 
    if (a > b)
        PG_RETURN_INT32(A_GREATER_THAN_B);
    else if (a == b)
        PG_RETURN_INT32(0);
    else
        PG_RETURN_INT32(A_LESS_THAN_B);
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, PG_GETARG_OID, and PG_RETURN_INT32.

btoidfastcmp()

static int btoidfastcmp ( Datum  x, Datum  y, SortSupport  ssup  )

static

Definition at line 434 of file nbtcompare.c.

{
    Oid         a = DatumGetObjectId(x);
    Oid         b = DatumGetObjectId(y);
 
    if (a > b)
        return A_GREATER_THAN_B;
    else if (a == b)
        return 0;
    else
        return A_LESS_THAN_B;
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, DatumGetObjectId(), x, and y.

Referenced by btoidsortsupport().

btoidskipsupport()

Datum btoidskipsupport

(

PG_FUNCTION_ARGS

)

Definition at line 489 of file nbtcompare.c.

{
    SkipSupport sksup = (SkipSupport) PG_GETARG_POINTER(0);
 
    sksup->decrement = oid_decrement;
    sksup->increment = oid_increment;
    sksup->low_elem = ObjectIdGetDatum(InvalidOid);
    sksup->high_elem = ObjectIdGetDatum(OID_MAX);
 
    PG_RETURN_VOID();
}

References SkipSupportData::decrement, SkipSupportData::high_elem, SkipSupportData::increment, InvalidOid, SkipSupportData::low_elem, ObjectIdGetDatum(), oid_decrement(), oid_increment(), OID_MAX, PG_GETARG_POINTER, and PG_RETURN_VOID.

btoidsortsupport()

Datum btoidsortsupport

(

PG_FUNCTION_ARGS

)

Definition at line 448 of file nbtcompare.c.

{
    SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
 
    ssup->comparator = btoidfastcmp;
    PG_RETURN_VOID();
}

References btoidfastcmp(), SortSupportData::comparator, PG_GETARG_POINTER, and PG_RETURN_VOID.

btoidvectorcmp()

Datum btoidvectorcmp

(

PG_FUNCTION_ARGS

)

Definition at line 502 of file nbtcompare.c.

{
    oidvector  *a = (oidvector *) PG_GETARG_POINTER(0);
    oidvector  *b = (oidvector *) PG_GETARG_POINTER(1);
    int         i;
 
    /* We arbitrarily choose to sort first by vector length */
    if (a->dim1 != b->dim1)
        PG_RETURN_INT32(a->dim1 - b->dim1);
 
    for (i = 0; i < a->dim1; i++)
    {
        if (a->values[i] != b->values[i])
        {
            if (a->values[i] > b->values[i])
                PG_RETURN_INT32(A_GREATER_THAN_B);
            else
                PG_RETURN_INT32(A_LESS_THAN_B);
        }
    }
    PG_RETURN_INT32(0);
}

References a, A_GREATER_THAN_B, A_LESS_THAN_B, b, i, PG_GETARG_POINTER, and PG_RETURN_INT32.

Referenced by oidvectoreq(), oidvectorge(), oidvectorgt(), oidvectorle(), oidvectorlt(), and oidvectorne().

char_decrement()

static Datum char_decrement ( Relation  rel, Datum  existing, bool *  underflow  )

static

Definition at line 536 of file nbtcompare.c.

{
    uint8       cexisting = DatumGetUInt8(existing);
 
    if (cexisting == 0)
    {
        /* return value is undefined */
        *underflow = true;
        return (Datum) 0;
    }
 
    *underflow = false;
    return CharGetDatum((uint8) cexisting - 1);
}

References CharGetDatum(), and DatumGetUInt8().

Referenced by btcharskipsupport().

char_increment()

static Datum char_increment ( Relation  rel, Datum  existing, bool *  overflow  )

static

Definition at line 552 of file nbtcompare.c.

{
    uint8       cexisting = DatumGetUInt8(existing);
 
    if (cexisting == UCHAR_MAX)
    {
        /* return value is undefined */
        *overflow = true;
        return (Datum) 0;
    }
 
    *overflow = false;
    return CharGetDatum((uint8) cexisting + 1);
}

References CharGetDatum(), and DatumGetUInt8().

Referenced by btcharskipsupport().

int2_decrement()

static Datum int2_decrement ( Relation  rel, Datum  existing, bool *  underflow  )

static

Definition at line 155 of file nbtcompare.c.

{
    int16       iexisting = DatumGetInt16(existing);
 
    if (iexisting == PG_INT16_MIN)
    {
        /* return value is undefined */
        *underflow = true;
        return (Datum) 0;
    }
 
    *underflow = false;
    return Int16GetDatum(iexisting - 1);
}

References DatumGetInt16(), Int16GetDatum(), and PG_INT16_MIN.

Referenced by btint2skipsupport().

int2_increment()

static Datum int2_increment ( Relation  rel, Datum  existing, bool *  overflow  )

static

Definition at line 171 of file nbtcompare.c.

{
    int16       iexisting = DatumGetInt16(existing);
 
    if (iexisting == PG_INT16_MAX)
    {
        /* return value is undefined */
        *overflow = true;
        return (Datum) 0;
    }
 
    *overflow = false;
    return Int16GetDatum(iexisting + 1);
}

References DatumGetInt16(), Int16GetDatum(), and PG_INT16_MAX.

Referenced by btint2skipsupport().

int4_decrement()

static Datum int4_decrement ( Relation  rel, Datum  existing, bool *  underflow  )

static

Definition at line 223 of file nbtcompare.c.

{
    int32       iexisting = DatumGetInt32(existing);
 
    if (iexisting == PG_INT32_MIN)
    {
        /* return value is undefined */
        *underflow = true;
        return (Datum) 0;
    }
 
    *underflow = false;
    return Int32GetDatum(iexisting - 1);
}

References DatumGetInt32(), Int32GetDatum(), and PG_INT32_MIN.

Referenced by btint4skipsupport().

int4_increment()

static Datum int4_increment ( Relation  rel, Datum  existing, bool *  overflow  )

static

Definition at line 239 of file nbtcompare.c.

{
    int32       iexisting = DatumGetInt32(existing);
 
    if (iexisting == PG_INT32_MAX)
    {
        /* return value is undefined */
        *overflow = true;
        return (Datum) 0;
    }
 
    *overflow = false;
    return Int32GetDatum(iexisting + 1);
}

References DatumGetInt32(), Int32GetDatum(), and PG_INT32_MAX.

Referenced by btint4skipsupport().

int8_decrement()

static Datum int8_decrement ( Relation  rel, Datum  existing, bool *  underflow  )

static

Definition at line 291 of file nbtcompare.c.

{
    int64       iexisting = DatumGetInt64(existing);
 
    if (iexisting == PG_INT64_MIN)
    {
        /* return value is undefined */
        *underflow = true;
        return (Datum) 0;
    }
 
    *underflow = false;
    return Int64GetDatum(iexisting - 1);
}

References DatumGetInt64(), Int64GetDatum(), and PG_INT64_MIN.

Referenced by btint8skipsupport().

int8_increment()

static Datum int8_increment ( Relation  rel, Datum  existing, bool *  overflow  )

static

Definition at line 307 of file nbtcompare.c.

{
    int64       iexisting = DatumGetInt64(existing);
 
    if (iexisting == PG_INT64_MAX)
    {
        /* return value is undefined */
        *overflow = true;
        return (Datum) 0;
    }
 
    *overflow = false;
    return Int64GetDatum(iexisting + 1);
}

References DatumGetInt64(), Int64GetDatum(), and PG_INT64_MAX.

Referenced by btint8skipsupport().

oid_decrement()

static Datum oid_decrement ( Relation  rel, Datum  existing, bool *  underflow  )

static

Definition at line 457 of file nbtcompare.c.

{
    Oid         oexisting = DatumGetObjectId(existing);
 
    if (oexisting == InvalidOid)
    {
        /* return value is undefined */
        *underflow = true;
        return (Datum) 0;
    }
 
    *underflow = false;
    return ObjectIdGetDatum(oexisting - 1);
}

References DatumGetObjectId(), InvalidOid, and ObjectIdGetDatum().

Referenced by btoidskipsupport().

oid_increment()

static Datum oid_increment ( Relation  rel, Datum  existing, bool *  overflow  )

static

Definition at line 473 of file nbtcompare.c.

{
    Oid         oexisting = DatumGetObjectId(existing);
 
    if (oexisting == OID_MAX)
    {
        /* return value is undefined */
        *overflow = true;
        return (Datum) 0;
    }
 
    *overflow = false;
    return ObjectIdGetDatum(oexisting + 1);
}

References DatumGetObjectId(), ObjectIdGetDatum(), and OID_MAX.

Referenced by btoidskipsupport().