gserialized_gist_picksplit_fallback()

static void gserialized_gist_picksplit_fallback ( GistEntryVector *  entryvec, GIST_SPLITVEC *  v  )

static

Definition at line 1639 of file gserialized_gist_nd.c.

References rtgdalraster::cur, gidx_copy(), and gidx_merge().

Referenced by gserialized_gist_picksplit().

{
        OffsetNumber i, maxoff;
        GIDX *unionL = NULL;
        GIDX *unionR = NULL;
        int nbytes;

        POSTGIS_DEBUG(4, "[GIST] in fallback picksplit function");

        maxoff = entryvec->n - 1;

        nbytes = (maxoff + 2) * sizeof(OffsetNumber);
        v->spl_left = (OffsetNumber*) palloc(nbytes);
        v->spl_right = (OffsetNumber*) palloc(nbytes);
        v->spl_nleft = v->spl_nright = 0;

        for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
        {
                GIDX *cur = (GIDX*)DatumGetPointer(entryvec->vector[i].key);

                if (i <= (maxoff - FirstOffsetNumber + 1) / 2)
                {
                        v->spl_left[v->spl_nleft] = i;
                        if (unionL == NULL)
                        {
                                unionL = gidx_copy(cur);
                        }
                        else
                        {
                                gidx_merge(&unionL, cur);
                        }
                        v->spl_nleft++;
                }
                else
                {
                        v->spl_right[v->spl_nright] = i;
                        if (unionR == NULL)
                        {
                                unionR = gidx_copy(cur);
                        }
                        else
                        {
                                gidx_merge(&unionR, cur);
                        }
                        v->spl_nright++;
                }
        }

        if (v->spl_ldatum_exists)
                gidx_merge(&unionL, (GIDX*)DatumGetPointer(v->spl_ldatum));

        v->spl_ldatum = PointerGetDatum(unionL);

        if (v->spl_rdatum_exists)
                gidx_merge(&unionR, (GIDX*)DatumGetPointer(v->spl_rdatum));

        v->spl_rdatum = PointerGetDatum(unionR);
        v->spl_ldatum_exists = v->spl_rdatum_exists = false;
}

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