ST_CurveN()

Datum ST_CurveN

(

PG_FUNCTION_ARGS

)

Definition at line 163 of file lwgeom_sqlmm.c.

{
        LWGEOM *subgeom;
        GSERIALIZED *geom = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *ret = NULL;
        int index = PG_GETARG_INT32(1);
        LWCOMPOUND *lwcmp = lwgeom_as_lwcompound(lwgeom_from_gserialized(geom));
        if (!lwcmp)
                PG_RETURN_NULL();
        if (index < 1 || (uint32_t)index > lwcmp->ngeoms)
                PG_RETURN_NULL();
        subgeom = lwgeom_clone(lwcollection_getsubcurve(lwcmp, index-1));
        ret = geometry_serialize(subgeom);
        PG_FREE_IF_COPY(geom, 0);
        PG_RETURN_POINTER(ret);
}

References lwcollection_getsubcurve(), lwgeom_as_lwcompound(), lwgeom_clone(), lwgeom_from_gserialized(), and LWCOMPOUND::ngeoms.

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