rtree index

[radi2015]

python

        t1 = duckdb_conn.sql("""
            select id,ST_GeomFromText(wkt_utm) as geom from layer_df
        """)
        duckdb_conn.sql("""
            CREATE INDEX t1_idx ON t1 USING RTREE (geom);
        """)

duckdb.duckdb.BinderException: Binder Error: can only create an index on a base table
it seems that con.sql() result can not create index