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open Ast
open Arrow_table
(*
--# Fill missing values
--#
--# Fills missing values in selected columns using the next or previous entry.
--#
--# @name fill
--# @param df :: DataFrame The DataFrame.
--# @param ... :: Symbol Columns to fill (use $col syntax).
--# @param .direction :: String (Optional) Direction in which to fill missing values.
--# Options: "down" (default), "up", "downup", "updown".
--# @return :: DataFrame The filled DataFrame.
--# @example
--# fill(df, $category, .direction = "down")
--# @family colcraft
--# @export
*)
let register env =
Env.add "fill"
(make_builtin_named ~name:"fill" ~variadic:true 1 (fun named_args _env ->
let df_arg = match named_args with
| (_, VDataFrame df) :: _ -> Some df
| _ -> None
in
let get_named k = List.find_map (fun (nk, v) -> if nk = Some k then Some v else None) named_args in
let positional = List.filter_map (fun (k, v) -> if k = None then Some v else None) named_args in
let direction = match get_named ".direction" with
| Some (VString s) -> s
| _ -> "down"
in
let cols_variants = match positional with _::tail -> tail | [] -> [] in
let cols_to_fill = List.filter_map Utils.extract_column_name cols_variants in
match df_arg with
| None -> Error.type_error "Function `fill` expects a DataFrame as first argument."
| Some df ->
let valid_directions = ["down"; "up"; "downup"; "updown"] in
if not (List.mem direction valid_directions) then
Error.type_error (Printf.sprintf "Function `fill` received invalid `.direction` value: \"%s\". Supported values are: down, up, downup, updown." direction)
else if cols_to_fill = [] then
Error.type_error "Function `fill` expects at least one column to fill using $col syntax."
else
let orig_nrows = Arrow_table.num_rows df.arrow_table in
let all_cols = Arrow_table.column_names df.arrow_table in
let missing_cols = List.filter (fun c -> not (List.mem c all_cols)) cols_to_fill in
if missing_cols <> [] then
Error.make_error KeyError (Printf.sprintf "Function `fill`: column(s) not found: %s" (String.concat ", " missing_cols))
else
let fill_col col_name data =
let new_arr = match data with
| IntColumn a ->
let b = Array.copy a in
let last = ref None in
if direction = "down" || direction = "downup" then
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "up" || direction = "updown" || (direction = "downup" && Array.exists Option.is_none b) then
begin
last := None;
for i = orig_nrows - 1 downto 0 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "updown" then (* if still has NAs, fill down *)
begin
last := None;
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done
end
end;
IntColumn b
| FloatColumn a ->
let b = Array.copy a in
let last = ref None in
if direction = "down" || direction = "downup" then
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "up" || direction = "updown" || (direction = "downup" && Array.exists Option.is_none b) then
begin
last := None;
for i = orig_nrows - 1 downto 0 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "updown" then
begin
last := None;
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done
end
end;
FloatColumn b
| StringColumn a ->
let is_missing = function
| None -> true
| Some "NA" | Some "na" | Some "N/A" -> true
| _ -> false
in
let b = Array.copy a in
let last = ref None in
if direction = "down" || direction = "downup" then
for i = 0 to orig_nrows - 1 do
if not (is_missing b.(i)) then last := b.(i)
else b.(i) <- !last
done;
if direction = "up" || direction = "updown" || (direction = "downup" && Array.exists is_missing b) then
begin
last := None;
for i = orig_nrows - 1 downto 0 do
if not (is_missing b.(i)) then last := b.(i)
else b.(i) <- !last
done;
if direction = "updown" then
begin
last := None;
for i = 0 to orig_nrows - 1 do
if not (is_missing b.(i)) then last := b.(i)
else b.(i) <- !last
done
end
end;
StringColumn b
| BoolColumn a ->
let b = Array.copy a in
let last = ref None in
if direction = "down" || direction = "downup" then
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "up" || direction = "updown" || (direction = "downup" && Array.exists Option.is_none b) then
begin
last := None;
for i = orig_nrows - 1 downto 0 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "updown" then
begin
last := None;
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done
end
end;
BoolColumn b
| DateColumn a ->
let b = Array.copy a in
let last = ref None in
if direction = "down" || direction = "downup" then
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "up" || direction = "updown" || (direction = "downup" && Array.exists Option.is_none b) then
begin
last := None;
for i = orig_nrows - 1 downto 0 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "updown" then
begin
last := None;
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done
end
end;
DateColumn b
| DatetimeColumn (a, tz) ->
let b = Array.copy a in
let last = ref None in
if direction = "down" || direction = "downup" then
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "up" || direction = "updown" || (direction = "downup" && Array.exists Option.is_none b) then
begin
last := None;
for i = orig_nrows - 1 downto 0 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "updown" then
begin
last := None;
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done
end
end;
DatetimeColumn (b, tz)
| DictionaryColumn (a, levels, ordered) ->
let b = Array.copy a in
let last = ref None in
if direction = "down" || direction = "downup" then
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "up" || direction = "updown" || (direction = "downup" && Array.exists Option.is_none b) || (direction = "updown" && Array.exists Option.is_none b) then
begin
last := None;
for i = orig_nrows - 1 downto 0 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done;
if direction = "updown" then
begin
last := None;
for i = 0 to orig_nrows - 1 do
match b.(i) with
| Some _ as v -> last := v
| None -> b.(i) <- !last
done
end
end;
DictionaryColumn (b, levels, ordered)
| NAColumn n -> NAColumn n
| ListColumn a -> ListColumn a
in
(col_name, new_arr)
in
let new_columns = List.map (fun col_name ->
let col_data = match Arrow_table.get_column df.arrow_table col_name with Some d -> d | None -> NAColumn orig_nrows in
if List.mem col_name cols_to_fill then
fill_col col_name col_data
else
(col_name, col_data)
) all_cols in
let new_schema = List.map (fun (n, c) -> (n, Arrow_table.column_type_of c)) new_columns in
VDataFrame { arrow_table = { schema = new_schema; columns = new_columns; nrows = orig_nrows; native_handle = None } |> Arrow_table.materialize; group_keys = df.group_keys }
))
env