duck copy to

def st_polars():
    gdf = pst.read_file("/Users/TU99MK0/Downloads/ellipse_r2000.shp")
    gdf = gdf.with_columns(pst.geom("geometry").st.to_wkt().alias("wkt"))
    gdf = gdf.select(pl.exclude(['geometry']))
    print(gdf.head(1))
    t1 = conn.sql("""
        select *,st_geomfromtext(wkt) as geometry 
        from gdf
    """)
    conn.sql("""
        select * from t1
    """).show()
    conn.sql("""
        COPY t1
        TO '1.geojson'
        WITH(FORMAT GDAL, DRIVER 'GeoJSON', SRS 'EPSG:25833')""")

    conn.sql("""
        COPY (select color,geometry from t1)
        TO '2.geojson'
        WITH(FORMAT GDAL, DRIVER 'GeoJSON', SRS 'EPSG:25833')""")

df = df.with_columns(pl.struct(pl.all()).map_elements(get_pms_task, return_dtype=pl.String).alias("历史任务信息"))