gserialized_gist_picksplit_constructsplit()

static void gserialized_gist_picksplit_constructsplit ( GIST_SPLITVEC *  v, OffsetNumber *  list1, int  nlist1, GIDX **  union1, OffsetNumber *  list2, int  nlist2, GIDX **  union2  )

static

Definition at line 1701 of file gserialized_gist_nd.c.

References FALSE, gidx_copy(), gidx_inter_volume(), gidx_merge(), and gserialized_gist_penalty().

Referenced by gserialized_gist_picksplit().

{
        bool            firstToLeft = true;

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

        if (v->spl_ldatum_exists || v->spl_rdatum_exists)
        {
                if (v->spl_ldatum_exists && v->spl_rdatum_exists)
                {
                        GIDX *LRl = gidx_copy(*union1);
                        GIDX *LRr = gidx_copy(*union2);
                        GIDX *RLl = gidx_copy(*union2);
                        GIDX *RLr = gidx_copy(*union1);
                        double sizeLR, sizeRL;

                        gidx_merge(&LRl, (GIDX*)DatumGetPointer(v->spl_ldatum));
                        gidx_merge(&LRr, (GIDX*)DatumGetPointer(v->spl_rdatum));
                        gidx_merge(&RLl, (GIDX*)DatumGetPointer(v->spl_ldatum));
                        gidx_merge(&RLr, (GIDX*)DatumGetPointer(v->spl_rdatum));

                        sizeLR = gidx_inter_volume(LRl,LRr);
                        sizeRL = gidx_inter_volume(RLl,RLr);

                        POSTGIS_DEBUGF(4, "[GIST] sizeLR / sizeRL == %.12g / %.12g", sizeLR, sizeRL);

                        if (sizeLR > sizeRL)
                                firstToLeft = false;

                }
                else
                {
                        float p1, p2;
                        GISTENTRY oldUnion,     addon;

                        gistentryinit(oldUnion, (v->spl_ldatum_exists) ? v->spl_ldatum : v->spl_rdatum,
                                      NULL, NULL, InvalidOffsetNumber, FALSE);

                        gistentryinit(addon, PointerGetDatum(*union1), NULL, NULL, InvalidOffsetNumber, FALSE);
                        DirectFunctionCall3(gserialized_gist_penalty, PointerGetDatum(&oldUnion), PointerGetDatum(&addon), PointerGetDatum(&p1));
                        gistentryinit(addon, PointerGetDatum(*union2), NULL, NULL, InvalidOffsetNumber, FALSE);
                        DirectFunctionCall3(gserialized_gist_penalty, PointerGetDatum(&oldUnion), PointerGetDatum(&addon), PointerGetDatum(&p2));

                        POSTGIS_DEBUGF(4, "[GIST] p1 / p2 == %.12g / %.12g", p1, p2);

                        if ((v->spl_ldatum_exists && p1 > p2) || (v->spl_rdatum_exists && p1 < p2))
                                firstToLeft = false;
                }
        }

        POSTGIS_DEBUGF(4, "[GIST] firstToLeft == %d", firstToLeft);

        if (firstToLeft)
        {
                v->spl_left = list1;
                v->spl_right = list2;
                v->spl_nleft = nlist1;
                v->spl_nright = nlist2;
                if (v->spl_ldatum_exists)
                        gidx_merge(union1, (GIDX*)DatumGetPointer(v->spl_ldatum));
                v->spl_ldatum = PointerGetDatum(*union1);
                if (v->spl_rdatum_exists)
                        gidx_merge(union2, (GIDX*)DatumGetPointer(v->spl_rdatum));
                v->spl_rdatum = PointerGetDatum(*union2);
        }
        else
        {
                v->spl_left = list2;
                v->spl_right = list1;
                v->spl_nleft = nlist2;
                v->spl_nright = nlist1;
                if (v->spl_ldatum_exists)
                        gidx_merge(union2, (GIDX*)DatumGetPointer(v->spl_ldatum));
                v->spl_ldatum = PointerGetDatum(*union2);
                if (v->spl_rdatum_exists)
                        gidx_merge(union1, (GIDX*)DatumGetPointer(v->spl_rdatum));
                v->spl_rdatum = PointerGetDatum(*union1);
        }

        v->spl_ldatum_exists = v->spl_rdatum_exists = false;
}

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