network_gist.c File Reference

#include "postgres.h"
#include <sys/socket.h>
#include "access/gist.h"
#include "access/stratnum.h"
#include "utils/fmgrprotos.h"
#include "utils/inet.h"
#include "varatt.h"

Include dependency graph for network_gist.c:

Go to the source code of this file.

Data Structures
struct	GistInetKey

Macros
#define	INETSTRAT_OVERLAPS   RTOverlapStrategyNumber
#define	INETSTRAT_EQ   RTEqualStrategyNumber
#define	INETSTRAT_NE   RTNotEqualStrategyNumber
#define	INETSTRAT_LT   RTLessStrategyNumber
#define	INETSTRAT_LE   RTLessEqualStrategyNumber
#define	INETSTRAT_GT   RTGreaterStrategyNumber
#define	INETSTRAT_GE   RTGreaterEqualStrategyNumber
#define	INETSTRAT_SUB   RTSubStrategyNumber
#define	INETSTRAT_SUBEQ   RTSubEqualStrategyNumber
#define	INETSTRAT_SUP   RTSuperStrategyNumber
#define	INETSTRAT_SUPEQ   RTSuperEqualStrategyNumber
#define	DatumGetInetKeyP(X)   ((GistInetKey *) DatumGetPointer(X))
#define	InetKeyPGetDatum(X)   PointerGetDatum(X)
#define	gk_ip_family(gkptr)   ((gkptr)->family)
#define	gk_ip_minbits(gkptr)   ((gkptr)->minbits)
#define	gk_ip_commonbits(gkptr)   ((gkptr)->commonbits)
#define	gk_ip_addr(gkptr)   ((gkptr)->ipaddr)
#define	ip_family_maxbits(fam)   ((fam) == PGSQL_AF_INET6 ? 128 : 32)
#define	gk_ip_addrsize(gkptr)    (gk_ip_family(gkptr) == PGSQL_AF_INET6 ? 16 : 4)
#define	gk_ip_maxbits(gkptr)    ip_family_maxbits(gk_ip_family(gkptr))
#define	SET_GK_VARSIZE(dst)    SET_VARSIZE_SHORT(dst, offsetof(GistInetKey, ipaddr) + gk_ip_addrsize(dst))

Typedefs
typedef struct GistInetKey	GistInetKey

Functions
Datum	inet_gist_consistent (PG_FUNCTION_ARGS)
static void	calc_inet_union_params (GISTENTRY *ent, int m, int n, int *minfamily_p, int *maxfamily_p, int *minbits_p, int *commonbits_p)
static void	calc_inet_union_params_indexed (GISTENTRY *ent, OffsetNumber *offsets, int noffsets, int *minfamily_p, int *maxfamily_p, int *minbits_p, int *commonbits_p)
static GistInetKey *	build_inet_union_key (int family, int minbits, int commonbits, unsigned char *addr)
Datum	inet_gist_union (PG_FUNCTION_ARGS)
Datum	inet_gist_compress (PG_FUNCTION_ARGS)
Datum	inet_gist_fetch (PG_FUNCTION_ARGS)
Datum	inet_gist_penalty (PG_FUNCTION_ARGS)
Datum	inet_gist_picksplit (PG_FUNCTION_ARGS)
Datum	inet_gist_same (PG_FUNCTION_ARGS)

Macro Definition Documentation

DatumGetInetKeyP

#define DatumGetInetKeyP

(

X

)

((GistInetKey *) DatumGetPointer(X))

Definition at line 88 of file network_gist.c.

gk_ip_addr

#define gk_ip_addr

(

gkptr

)

((gkptr)->ipaddr)

Definition at line 99 of file network_gist.c.

gk_ip_addrsize

#define gk_ip_addrsize

(

gkptr

)

(gk_ip_family(gkptr) == PGSQL_AF_INET6 ? 16 : 4)

Definition at line 103 of file network_gist.c.

                                                : 4)

gk_ip_commonbits

#define gk_ip_commonbits

(

gkptr

)

((gkptr)->commonbits)

Definition at line 98 of file network_gist.c.

gk_ip_family

#define gk_ip_family

(

gkptr

)

((gkptr)->family)

Definition at line 96 of file network_gist.c.

gk_ip_maxbits

#define gk_ip_maxbits

(

gkptr

)

ip_family_maxbits(gk_ip_family(gkptr))

Definition at line 105 of file network_gist.c.

gk_ip_minbits

#define gk_ip_minbits

(

gkptr

)

((gkptr)->minbits)

Definition at line 97 of file network_gist.c.

InetKeyPGetDatum

#define InetKeyPGetDatum

(

X

)

PointerGetDatum(X)

Definition at line 89 of file network_gist.c.

INETSTRAT_EQ

#define INETSTRAT_EQ   RTEqualStrategyNumber

Definition at line 60 of file network_gist.c.

INETSTRAT_GE

#define INETSTRAT_GE   RTGreaterEqualStrategyNumber

Definition at line 65 of file network_gist.c.

INETSTRAT_GT

#define INETSTRAT_GT   RTGreaterStrategyNumber

Definition at line 64 of file network_gist.c.

INETSTRAT_LE

#define INETSTRAT_LE   RTLessEqualStrategyNumber

Definition at line 63 of file network_gist.c.

INETSTRAT_LT

#define INETSTRAT_LT   RTLessStrategyNumber

Definition at line 62 of file network_gist.c.

INETSTRAT_NE

#define INETSTRAT_NE   RTNotEqualStrategyNumber

Definition at line 61 of file network_gist.c.

INETSTRAT_OVERLAPS

#define INETSTRAT_OVERLAPS   RTOverlapStrategyNumber

Definition at line 59 of file network_gist.c.

INETSTRAT_SUB

#define INETSTRAT_SUB   RTSubStrategyNumber

Definition at line 66 of file network_gist.c.

INETSTRAT_SUBEQ

#define INETSTRAT_SUBEQ   RTSubEqualStrategyNumber

Definition at line 67 of file network_gist.c.

INETSTRAT_SUP

#define INETSTRAT_SUP   RTSuperStrategyNumber

Definition at line 68 of file network_gist.c.

INETSTRAT_SUPEQ

#define INETSTRAT_SUPEQ   RTSuperEqualStrategyNumber

Definition at line 69 of file network_gist.c.

ip_family_maxbits

#define ip_family_maxbits

(

fam

)

((fam) == PGSQL_AF_INET6 ? 128 : 32)

Definition at line 100 of file network_gist.c.

SET_GK_VARSIZE

#define SET_GK_VARSIZE

(

dst

)

SET_VARSIZE_SHORT(dst, offsetof(GistInetKey, ipaddr) + gk_ip_addrsize(dst))

Definition at line 107 of file network_gist.c.

Typedef Documentation

GistInetKey

typedef struct GistInetKey GistInetKey

Function Documentation

build_inet_union_key()

static GistInetKey * build_inet_union_key ( int  family, int  minbits, int  commonbits, unsigned char *  addr  )

static

Definition at line 473 of file network_gist.c.

{
    GistInetKey *result;
 
    /* Make sure any unused bits are zeroed. */
    result = palloc0_object(GistInetKey);
 
    gk_ip_family(result) = family;
    gk_ip_minbits(result) = minbits;
    gk_ip_commonbits(result) = commonbits;
 
    /* Clone appropriate bytes of the address. */
    if (commonbits > 0)
        memcpy(gk_ip_addr(result), addr, (commonbits + 7) / 8);
 
    /* Clean any unwanted bits in the last partial byte. */
    if (commonbits % 8 != 0)
        gk_ip_addr(result)[commonbits / 8] &= ~(0xFF >> (commonbits % 8));
 
    /* Set varlena header correctly. */
    SET_GK_VARSIZE(result);
 
    return result;
}

References fb(), gk_ip_addr, gk_ip_commonbits, gk_ip_family, gk_ip_minbits, palloc0_object, and SET_GK_VARSIZE.

Referenced by inet_gist_picksplit(), and inet_gist_union().

calc_inet_union_params()

static void calc_inet_union_params ( GISTENTRY *  ent, int  m, int  n, int *  minfamily_p, int *  maxfamily_p, int *  minbits_p, int *  commonbits_p  )

static

Definition at line 346 of file network_gist.c.

{
    int         minfamily,
                maxfamily,
                minbits,
                commonbits;
    unsigned char *addr;
    GistInetKey *tmp;
    int         i;
 
    /* Must be at least one key. */
    Assert(m <= n);
 
    /* Initialize variables using the first key. */
    tmp = DatumGetInetKeyP(ent[m].key);
    minfamily = maxfamily = gk_ip_family(tmp);
    minbits = gk_ip_minbits(tmp);
    commonbits = gk_ip_commonbits(tmp);
    addr = gk_ip_addr(tmp);
 
    /* Scan remaining keys. */
    for (i = m + 1; i <= n; i++)
    {
        tmp = DatumGetInetKeyP(ent[i].key);
 
        /* Determine range of family numbers */
        if (minfamily > gk_ip_family(tmp))
            minfamily = gk_ip_family(tmp);
        if (maxfamily < gk_ip_family(tmp))
            maxfamily = gk_ip_family(tmp);
 
        /* Find minimum minbits */
        if (minbits > gk_ip_minbits(tmp))
            minbits = gk_ip_minbits(tmp);
 
        /* Find minimum number of bits in common */
        if (commonbits > gk_ip_commonbits(tmp))
            commonbits = gk_ip_commonbits(tmp);
        if (commonbits > 0)
            commonbits = bitncommon(addr, gk_ip_addr(tmp), commonbits);
    }
 
    /* Force minbits/commonbits to zero if more than one family. */
    if (minfamily != maxfamily)
        minbits = commonbits = 0;
 
    *minfamily_p = minfamily;
    *maxfamily_p = maxfamily;
    *minbits_p = minbits;
    *commonbits_p = commonbits;
}

References Assert, bitncommon(), DatumGetInetKeyP, fb(), gk_ip_addr, gk_ip_commonbits, gk_ip_family, gk_ip_minbits, and i.

Referenced by inet_gist_picksplit(), and inet_gist_union().

calc_inet_union_params_indexed()

static void calc_inet_union_params_indexed ( GISTENTRY *  ent, OffsetNumber *  offsets, int  noffsets, int *  minfamily_p, int *  maxfamily_p, int *  minbits_p, int *  commonbits_p  )

static

Definition at line 408 of file network_gist.c.

{
    int         minfamily,
                maxfamily,
                minbits,
                commonbits;
    unsigned char *addr;
    GistInetKey *tmp;
    int         i;
 
    /* Must be at least one key. */
    Assert(noffsets > 0);
 
    /* Initialize variables using the first key. */
    tmp = DatumGetInetKeyP(ent[offsets[0]].key);
    minfamily = maxfamily = gk_ip_family(tmp);
    minbits = gk_ip_minbits(tmp);
    commonbits = gk_ip_commonbits(tmp);
    addr = gk_ip_addr(tmp);
 
    /* Scan remaining keys. */
    for (i = 1; i < noffsets; i++)
    {
        tmp = DatumGetInetKeyP(ent[offsets[i]].key);
 
        /* Determine range of family numbers */
        if (minfamily > gk_ip_family(tmp))
            minfamily = gk_ip_family(tmp);
        if (maxfamily < gk_ip_family(tmp))
            maxfamily = gk_ip_family(tmp);
 
        /* Find minimum minbits */
        if (minbits > gk_ip_minbits(tmp))
            minbits = gk_ip_minbits(tmp);
 
        /* Find minimum number of bits in common */
        if (commonbits > gk_ip_commonbits(tmp))
            commonbits = gk_ip_commonbits(tmp);
        if (commonbits > 0)
            commonbits = bitncommon(addr, gk_ip_addr(tmp), commonbits);
    }
 
    /* Force minbits/commonbits to zero if more than one family. */
    if (minfamily != maxfamily)
        minbits = commonbits = 0;
 
    *minfamily_p = minfamily;
    *maxfamily_p = maxfamily;
    *minbits_p = minbits;
    *commonbits_p = commonbits;
}

References Assert, bitncommon(), DatumGetInetKeyP, fb(), gk_ip_addr, gk_ip_commonbits, gk_ip_family, gk_ip_minbits, and i.

Referenced by inet_gist_picksplit().

inet_gist_compress()

Datum inet_gist_compress

(

PG_FUNCTION_ARGS

)

Definition at line 543 of file network_gist.c.

{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    GISTENTRY  *retval;
 
    if (entry->leafkey)
    {
        retval = palloc_object(GISTENTRY);
        if (DatumGetPointer(entry->key) != NULL)
        {
            inet       *in = DatumGetInetPP(entry->key);
            GistInetKey *r;
 
            r = palloc0_object(GistInetKey);
 
            gk_ip_family(r) = ip_family(in);
            gk_ip_minbits(r) = ip_bits(in);
            gk_ip_commonbits(r) = gk_ip_maxbits(r);
            memcpy(gk_ip_addr(r), ip_addr(in), gk_ip_addrsize(r));
            SET_GK_VARSIZE(r);
 
            gistentryinit(*retval, PointerGetDatum(r),
                          entry->rel, entry->page,
                          entry->offset, false);
        }
        else
        {
            gistentryinit(*retval, (Datum) 0,
                          entry->rel, entry->page,
                          entry->offset, false);
        }
    }
    else
        retval = entry;
    PG_RETURN_POINTER(retval);
}

References DatumGetInetPP(), DatumGetPointer(), fb(), gistentryinit, gk_ip_addr, gk_ip_addrsize, gk_ip_commonbits, gk_ip_family, gk_ip_maxbits, gk_ip_minbits, ip_addr, ip_bits, ip_family, GISTENTRY::key, GISTENTRY::leafkey, GISTENTRY::offset, GISTENTRY::page, palloc0_object, palloc_object, PG_GETARG_POINTER, PG_RETURN_POINTER, PointerGetDatum(), GISTENTRY::rel, and SET_GK_VARSIZE.

inet_gist_consistent()

Datum inet_gist_consistent

(

PG_FUNCTION_ARGS

)

Definition at line 115 of file network_gist.c.

{
    GISTENTRY  *ent = (GISTENTRY *) PG_GETARG_POINTER(0);
    inet       *query = PG_GETARG_INET_PP(1);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
#ifdef NOT_USED
    Oid         subtype = PG_GETARG_OID(3);
#endif
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    GistInetKey *key = DatumGetInetKeyP(ent->key);
    int         minbits,
                order;
 
    /* All operators served by this function are exact. */
    *recheck = false;
 
    /*
     * Check 0: different families
     *
     * If key represents multiple address families, its children could match
     * anything.  This can only happen on an inner index page.
     */
    if (gk_ip_family(key) == 0)
    {
        Assert(!GIST_LEAF(ent));
        PG_RETURN_BOOL(true);
    }
 
    /*
     * Check 1: different families
     *
     * Matching families do not help any of the strategies.
     */
    if (gk_ip_family(key) != ip_family(query))
    {
        switch (strategy)
        {
            case INETSTRAT_LT:
            case INETSTRAT_LE:
                if (gk_ip_family(key) < ip_family(query))
                    PG_RETURN_BOOL(true);
                break;
 
            case INETSTRAT_GE:
            case INETSTRAT_GT:
                if (gk_ip_family(key) > ip_family(query))
                    PG_RETURN_BOOL(true);
                break;
 
            case INETSTRAT_NE:
                PG_RETURN_BOOL(true);
        }
        /* For all other cases, we can be sure there is no match */
        PG_RETURN_BOOL(false);
    }
 
    /*
     * Check 2: network bit count
     *
     * Network bit count (ip_bits) helps to check leaves for sub network and
     * sup network operators.  At non-leaf nodes, we know every child value
     * has ip_bits >= gk_ip_minbits(key), so we can avoid descending in some
     * cases too.
     */
    switch (strategy)
    {
        case INETSTRAT_SUB:
            if (GIST_LEAF(ent) && gk_ip_minbits(key) <= ip_bits(query))
                PG_RETURN_BOOL(false);
            break;
 
        case INETSTRAT_SUBEQ:
            if (GIST_LEAF(ent) && gk_ip_minbits(key) < ip_bits(query))
                PG_RETURN_BOOL(false);
            break;
 
        case INETSTRAT_SUPEQ:
        case INETSTRAT_EQ:
            if (gk_ip_minbits(key) > ip_bits(query))
                PG_RETURN_BOOL(false);
            break;
 
        case INETSTRAT_SUP:
            if (gk_ip_minbits(key) >= ip_bits(query))
                PG_RETURN_BOOL(false);
            break;
    }
 
    /*
     * Check 3: common network bits
     *
     * Compare available common prefix bits to the query, but not beyond
     * either the query's netmask or the minimum netmask among the represented
     * values.  If these bits don't match the query, we have our answer (and
     * may or may not need to descend, depending on the operator).  If they do
     * match, and we are not at a leaf, we descend in all cases.
     *
     * Note this is the final check for operators that only consider the
     * network part of the address.
     */
    minbits = Min(gk_ip_commonbits(key), gk_ip_minbits(key));
    minbits = Min(minbits, ip_bits(query));
 
    order = bitncmp(gk_ip_addr(key), ip_addr(query), minbits);
 
    switch (strategy)
    {
        case INETSTRAT_SUB:
        case INETSTRAT_SUBEQ:
        case INETSTRAT_OVERLAPS:
        case INETSTRAT_SUPEQ:
        case INETSTRAT_SUP:
            PG_RETURN_BOOL(order == 0);
 
        case INETSTRAT_LT:
        case INETSTRAT_LE:
            if (order > 0)
                PG_RETURN_BOOL(false);
            if (order < 0 || !GIST_LEAF(ent))
                PG_RETURN_BOOL(true);
            break;
 
        case INETSTRAT_EQ:
            if (order != 0)
                PG_RETURN_BOOL(false);
            if (!GIST_LEAF(ent))
                PG_RETURN_BOOL(true);
            break;
 
        case INETSTRAT_GE:
        case INETSTRAT_GT:
            if (order < 0)
                PG_RETURN_BOOL(false);
            if (order > 0 || !GIST_LEAF(ent))
                PG_RETURN_BOOL(true);
            break;
 
        case INETSTRAT_NE:
            if (order != 0 || !GIST_LEAF(ent))
                PG_RETURN_BOOL(true);
            break;
    }
 
    /*
     * Remaining checks are only for leaves and basic comparison strategies.
     * See network_cmp_internal() in network.c for the implementation we need
     * to match.  Note that in a leaf key, commonbits should equal the address
     * length, so we compared the whole network parts above.
     */
    Assert(GIST_LEAF(ent));
 
    /*
     * Check 4: network bit count
     *
     * Next step is to compare netmask widths.
     */
    switch (strategy)
    {
        case INETSTRAT_LT:
        case INETSTRAT_LE:
            if (gk_ip_minbits(key) < ip_bits(query))
                PG_RETURN_BOOL(true);
            if (gk_ip_minbits(key) > ip_bits(query))
                PG_RETURN_BOOL(false);
            break;
 
        case INETSTRAT_EQ:
            if (gk_ip_minbits(key) != ip_bits(query))
                PG_RETURN_BOOL(false);
            break;
 
        case INETSTRAT_GE:
        case INETSTRAT_GT:
            if (gk_ip_minbits(key) > ip_bits(query))
                PG_RETURN_BOOL(true);
            if (gk_ip_minbits(key) < ip_bits(query))
                PG_RETURN_BOOL(false);
            break;
 
        case INETSTRAT_NE:
            if (gk_ip_minbits(key) != ip_bits(query))
                PG_RETURN_BOOL(true);
            break;
    }
 
    /*
     * Check 5: whole address
     *
     * Netmask bit counts are the same, so check all the address bits.
     */
    order = bitncmp(gk_ip_addr(key), ip_addr(query), gk_ip_maxbits(key));
 
    switch (strategy)
    {
        case INETSTRAT_LT:
            PG_RETURN_BOOL(order < 0);
 
        case INETSTRAT_LE:
            PG_RETURN_BOOL(order <= 0);
 
        case INETSTRAT_EQ:
            PG_RETURN_BOOL(order == 0);
 
        case INETSTRAT_GE:
            PG_RETURN_BOOL(order >= 0);
 
        case INETSTRAT_GT:
            PG_RETURN_BOOL(order > 0);
 
        case INETSTRAT_NE:
            PG_RETURN_BOOL(order != 0);
    }
 
    elog(ERROR, "unknown strategy for inet GiST");
    PG_RETURN_BOOL(false);      /* keep compiler quiet */
}

References Assert, bitncmp(), DatumGetInetKeyP, elog, ERROR, fb(), GIST_LEAF, gk_ip_addr, gk_ip_commonbits, gk_ip_family, gk_ip_maxbits, gk_ip_minbits, INETSTRAT_EQ, INETSTRAT_GE, INETSTRAT_GT, INETSTRAT_LE, INETSTRAT_LT, INETSTRAT_NE, INETSTRAT_OVERLAPS, INETSTRAT_SUB, INETSTRAT_SUBEQ, INETSTRAT_SUP, INETSTRAT_SUPEQ, ip_addr, ip_bits, ip_family, Min, PG_GETARG_INET_PP, PG_GETARG_OID, PG_GETARG_POINTER, PG_GETARG_UINT16, and PG_RETURN_BOOL.

inet_gist_fetch()

Datum inet_gist_fetch

(

PG_FUNCTION_ARGS

)

Definition at line 591 of file network_gist.c.

{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    GistInetKey *key = DatumGetInetKeyP(entry->key);
    GISTENTRY  *retval;
    inet       *dst;
 
    dst = palloc0_object(inet);
 
    ip_family(dst) = gk_ip_family(key);
    ip_bits(dst) = gk_ip_minbits(key);
    memcpy(ip_addr(dst), gk_ip_addr(key), ip_addrsize(dst));
    SET_INET_VARSIZE(dst);
 
    retval = palloc_object(GISTENTRY);
    gistentryinit(*retval, InetPGetDatum(dst), entry->rel, entry->page,
                  entry->offset, false);
 
    PG_RETURN_POINTER(retval);
}

References DatumGetInetKeyP, fb(), gistentryinit, gk_ip_addr, gk_ip_family, gk_ip_minbits, InetPGetDatum(), ip_addr, ip_addrsize, ip_bits, ip_family, GISTENTRY::key, GISTENTRY::offset, GISTENTRY::page, palloc0_object, palloc_object, PG_GETARG_POINTER, PG_RETURN_POINTER, GISTENTRY::rel, and SET_INET_VARSIZE.

inet_gist_penalty()

Datum inet_gist_penalty

(

PG_FUNCTION_ARGS

)

Definition at line 621 of file network_gist.c.

{
    GISTENTRY  *origent = (GISTENTRY *) PG_GETARG_POINTER(0);
    GISTENTRY  *newent = (GISTENTRY *) PG_GETARG_POINTER(1);
    float      *penalty = (float *) PG_GETARG_POINTER(2);
    GistInetKey *orig = DatumGetInetKeyP(origent->key),
               *new = DatumGetInetKeyP(newent->key);
    int         commonbits;
 
    if (gk_ip_family(orig) == gk_ip_family(new))
    {
        if (gk_ip_minbits(orig) <= gk_ip_minbits(new))
        {
            commonbits = bitncommon(gk_ip_addr(orig), gk_ip_addr(new),
                                    Min(gk_ip_commonbits(orig),
                                        gk_ip_commonbits(new)));
            if (commonbits > 0)
                *penalty = 1.0f / commonbits;
            else
                *penalty = 2;
        }
        else
            *penalty = 3;
    }
    else
        *penalty = 4;
 
    PG_RETURN_POINTER(penalty);
}

References bitncommon(), DatumGetInetKeyP, fb(), gk_ip_addr, gk_ip_commonbits, gk_ip_family, gk_ip_minbits, Min, PG_GETARG_POINTER, and PG_RETURN_POINTER.

inet_gist_picksplit()

Datum inet_gist_picksplit

(

PG_FUNCTION_ARGS

)

Definition at line 664 of file network_gist.c.

{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    GIST_SPLITVEC *splitvec = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
    GISTENTRY  *ent = entryvec->vector;
    int         minfamily,
                maxfamily,
                minbits,
                commonbits;
    unsigned char *addr;
    GistInetKey *tmp,
               *left_union,
               *right_union;
    int         maxoff,
                nbytes;
    OffsetNumber i,
               *left,
               *right;
 
    maxoff = entryvec->n - 1;
    nbytes = (maxoff + 1) * sizeof(OffsetNumber);
 
    left = (OffsetNumber *) palloc(nbytes);
    right = (OffsetNumber *) palloc(nbytes);
 
    splitvec->spl_left = left;
    splitvec->spl_right = right;
 
    splitvec->spl_nleft = 0;
    splitvec->spl_nright = 0;
 
    /* Determine parameters of the union of all the inputs. */
    calc_inet_union_params(ent, FirstOffsetNumber, maxoff,
                           &minfamily, &maxfamily,
                           &minbits, &commonbits);
 
    if (minfamily != maxfamily)
    {
        /* Multiple families, so split by family. */
        for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
        {
            /*
             * If there's more than 2 families, all but maxfamily go into the
             * left union.  This could only happen if the inputs include some
             * IPv4, some IPv6, and some already-multiple-family unions.
             */
            tmp = DatumGetInetKeyP(ent[i].key);
            if (gk_ip_family(tmp) != maxfamily)
                left[splitvec->spl_nleft++] = i;
            else
                right[splitvec->spl_nright++] = i;
        }
    }
    else
    {
        /*
         * Split on the next bit after the common bits.  If that yields a
         * trivial split, try the next bit position to the right.  Repeat till
         * success; or if we run out of bits, do an arbitrary 50-50 split.
         */
        int         maxbits = ip_family_maxbits(minfamily);
 
        while (commonbits < maxbits)
        {
            /* Split using the commonbits'th bit position. */
            int         bitbyte = commonbits / 8;
            int         bitmask = 0x80 >> (commonbits % 8);
 
            splitvec->spl_nleft = splitvec->spl_nright = 0;
 
            for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
            {
                tmp = DatumGetInetKeyP(ent[i].key);
                addr = gk_ip_addr(tmp);
                if ((addr[bitbyte] & bitmask) == 0)
                    left[splitvec->spl_nleft++] = i;
                else
                    right[splitvec->spl_nright++] = i;
            }
 
            if (splitvec->spl_nleft > 0 && splitvec->spl_nright > 0)
                break;          /* success */
            commonbits++;
        }
 
        if (commonbits >= maxbits)
        {
            /* Failed ... do a 50-50 split. */
            splitvec->spl_nleft = splitvec->spl_nright = 0;
 
            for (i = FirstOffsetNumber; i <= maxoff / 2; i = OffsetNumberNext(i))
            {
                left[splitvec->spl_nleft++] = i;
            }
            for (; i <= maxoff; i = OffsetNumberNext(i))
            {
                right[splitvec->spl_nright++] = i;
            }
        }
    }
 
    /*
     * Compute the union value for each side from scratch.  In most cases we
     * could approximate the union values with what we already know, but this
     * ensures that each side has minbits and commonbits set as high as
     * possible.
     */
    calc_inet_union_params_indexed(ent, left, splitvec->spl_nleft,
                                   &minfamily, &maxfamily,
                                   &minbits, &commonbits);
    if (minfamily != maxfamily)
        minfamily = 0;
    tmp = DatumGetInetKeyP(ent[left[0]].key);
    addr = gk_ip_addr(tmp);
    left_union = build_inet_union_key(minfamily, minbits, commonbits, addr);
    splitvec->spl_ldatum = PointerGetDatum(left_union);
 
    calc_inet_union_params_indexed(ent, right, splitvec->spl_nright,
                                   &minfamily, &maxfamily,
                                   &minbits, &commonbits);
    if (minfamily != maxfamily)
        minfamily = 0;
    tmp = DatumGetInetKeyP(ent[right[0]].key);
    addr = gk_ip_addr(tmp);
    right_union = build_inet_union_key(minfamily, minbits, commonbits, addr);
    splitvec->spl_rdatum = PointerGetDatum(right_union);
 
    PG_RETURN_POINTER(splitvec);
}

References build_inet_union_key(), calc_inet_union_params(), calc_inet_union_params_indexed(), DatumGetInetKeyP, fb(), FirstOffsetNumber, gk_ip_addr, gk_ip_family, i, ip_family_maxbits, OffsetNumberNext, palloc(), PG_GETARG_POINTER, PG_RETURN_POINTER, and PointerGetDatum().

inet_gist_same()

Datum inet_gist_same

(

PG_FUNCTION_ARGS

)

Definition at line 798 of file network_gist.c.

{
    GistInetKey *left = DatumGetInetKeyP(PG_GETARG_DATUM(0));
    GistInetKey *right = DatumGetInetKeyP(PG_GETARG_DATUM(1));
    bool       *result = (bool *) PG_GETARG_POINTER(2);
 
    *result = (gk_ip_family(left) == gk_ip_family(right) &&
               gk_ip_minbits(left) == gk_ip_minbits(right) &&
               gk_ip_commonbits(left) == gk_ip_commonbits(right) &&
               memcmp(gk_ip_addr(left), gk_ip_addr(right),
                      gk_ip_addrsize(left)) == 0);
 
    PG_RETURN_POINTER(result);
}

References DatumGetInetKeyP, fb(), gk_ip_addr, gk_ip_addrsize, gk_ip_commonbits, gk_ip_family, gk_ip_minbits, PG_GETARG_DATUM, PG_GETARG_POINTER, and PG_RETURN_POINTER.

inet_gist_union()

Datum inet_gist_union

(

PG_FUNCTION_ARGS

)

Definition at line 506 of file network_gist.c.

{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    GISTENTRY  *ent = entryvec->vector;
    int         minfamily,
                maxfamily,
                minbits,
                commonbits;
    unsigned char *addr;
    GistInetKey *tmp,
               *result;
 
    /* Determine parameters of the union. */
    calc_inet_union_params(ent, 0, entryvec->n - 1,
                           &minfamily, &maxfamily,
                           &minbits, &commonbits);
 
    /* If more than one family, emit family number zero. */
    if (minfamily != maxfamily)
        minfamily = 0;
 
    /* Initialize address using the first key. */
    tmp = DatumGetInetKeyP(ent[0].key);
    addr = gk_ip_addr(tmp);
 
    /* Construct the union value. */
    result = build_inet_union_key(minfamily, minbits, commonbits, addr);
 
    PG_RETURN_POINTER(result);
}

References build_inet_union_key(), calc_inet_union_params(), DatumGetInetKeyP, fb(), gk_ip_addr, PG_GETARG_POINTER, and PG_RETURN_POINTER.