gserialized_gist_union()

Datum gserialized_gist_union

(

PG_FUNCTION_ARGS

)

Definition at line 1410 of file gserialized_gist_nd.c.

{
        GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
        int *sizep = (int *) PG_GETARG_POINTER(1); /* Size of the return value */
        int     numranges, i;
        GIDX *box_cur, *box_union;
 
        POSTGIS_DEBUG(4, "[GIST] 'union' function called");
 
        numranges = entryvec->n;
 
        box_cur = (GIDX*) DatumGetPointer(entryvec->vector[0].key);
 
        box_union = gidx_copy(box_cur);
 
        for ( i = 1; i < numranges; i++ )
        {
                box_cur = (GIDX*) DatumGetPointer(entryvec->vector[i].key);
                gidx_merge(&box_union, box_cur);
        }
 
        *sizep = VARSIZE(box_union);
 
        POSTGIS_DEBUGF(4, "[GIST] union called, numranges(%i), pageunion %s", numranges, gidx_to_string(box_union));
 
        PG_RETURN_POINTER(box_union);
 
}

References gidx_copy(), and gidx_merge().

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