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 1474 of file gserialized_gist_nd.c.

{
        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 *)PG_DETOAST_DATUM(v->spl_ldatum));
                        gidx_merge(&LRr, (GIDX *)PG_DETOAST_DATUM(v->spl_rdatum));
                        gidx_merge(&RLl, (GIDX *)PG_DETOAST_DATUM(v->spl_ldatum));
                        gidx_merge(&RLr, (GIDX *)PG_DETOAST_DATUM(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 = 0.0, p2 = 0.0;
                        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 *)PG_DETOAST_DATUM(v->spl_ldatum));
                v->spl_ldatum = PointerGetDatum(*union1);
                if (v->spl_rdatum_exists)
                        gidx_merge(union2, (GIDX *)PG_DETOAST_DATUM(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 *)PG_DETOAST_DATUM(v->spl_ldatum));
                v->spl_ldatum = PointerGetDatum(*union2);
                if (v->spl_rdatum_exists)
                        gidx_merge(union1, (GIDX *)PG_DETOAST_DATUM(v->spl_rdatum));
                v->spl_rdatum = PointerGetDatum(*union1);
        }
 
        v->spl_ldatum_exists = v->spl_rdatum_exists = false;
}

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

Referenced by gserialized_gist_picksplit().

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