Leo Liu

Thank you for your reply. I rebuilt the jupyterlab with no luck. There are also no errors. The gruvbox-light works just fine..

Great suggestion! I will add S-1 soon depending on how complex the parsing is

If there are more than two columns, then better use fill_null. ```python df = pl.DataFrame({"a": [None, None, None], "b": [1, 2, None], "c": [1, None, 3]}) df.with_column((c("a").fill_null(c("b")).fill_null(c("c"))).alias("combine_first")) ```

Thanks! This works great as temporary fix.