read_lwgeom_from_partition()

static LWGEOM * read_lwgeom_from_partition ( WindowObject  win_obj, uint32_t  i, bool *  is_null  )

static

Definition at line 72 of file lwgeom_window.c.

{
        GSERIALIZED* g;
        Datum arg = WinGetFuncArgInPartition(win_obj, 0, i, WINDOW_SEEK_HEAD, false, is_null, NULL);
 
        if (*is_null) {
                /* So that the indexes in our clustering input array can match our partition positions,
                 * toss an empty point into the clustering inputs, as a pass-through.
                 * NOTE: this will cause gaps in the output cluster id sequence.
                 * */
                return lwpoint_as_lwgeom(lwpoint_construct_empty(0, 0, 0));
        }
 
        g = (GSERIALIZED*) PG_DETOAST_DATUM_COPY(arg);
        return lwgeom_from_gserialized(g);
}

References lwgeom_from_gserialized(), lwpoint_as_lwgeom(), and lwpoint_construct_empty().

Referenced by ST_ClusterDBSCAN(), and ST_ClusterWithinWin().

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