fixed InvalidOperationError bug

[smartbackwards]

issue was found trying to access any dataframe from map 1 of https://www.hltv.org/matches/2380994/betboom-vs-og-pgl-astana-2025-europe-closed-qualifier

``C:\Users\username\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0\LocalCache\local-packages\Python311\site-packages\polars\lazyframe\frame.py", line 2332, in collect return wrap_df(ldf.collect(engine, callback)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ polars.exceptions.InvalidOperationError: argument in operation 'asof_join' is not sorted, please sort the 'expr/series/column' first

was raised probably due to the tick column not being out of order

issue was fixed when I tested the change in a clean venv

[adisujithkumar]

Here is the entire stack trace of the error I am seeing when I am trying to parse the same demo with the parse_demo.ipynb example notebook:

---------------------------------------------------------------------------
InvalidOperationError                     Traceback (most recent call last)
Cell In[8], line 11
      9 print(f"\nHeader: \n{dem.header}")
     10 print(f"\nRounds: \n{dem.rounds.head(n=3)}")
---> 11 print(f"\nKills: \n{dem.kills.head(n=3)}")
     12 print(f"\nDamages: \n{dem.damages.head(n=3)}")
     13 print(f"\nWeapon Fires: \n{dem.shots.head(n=3)}")

File [~/.local/share/uv/python/cpython-3.11.11-linux-x86_64-gnu/lib/python3.11/functools.py:1001](http://localhost:8888/lab/tree/docs/examples/~/.local/share/uv/python/cpython-3.11.11-linux-x86_64-gnu/lib/python3.11/functools.py#line=1000), in cached_property.__get__(self, instance, owner)
    999 val = cache.get(self.attrname, _NOT_FOUND)
   1000 if val is _NOT_FOUND:
-> 1001     val = self.func(instance)
   1002     try:
   1003         cache[self.attrname] = val

File /mnt/d/projects/fps/awpy/awpy/awpy/demo.py:334, in Demo.kills(self)
    332 kills = awpy.parsers.utils.get_event_from_parsed_events(self.events, "player_death")
    333 kills = awpy.parsers.events.parse_kills(kills)
--> 334 return awpy.parsers.rounds.apply_round_num(df=kills, rounds_df=self.rounds, tick_col="tick").filter(
    335     pl.col("round_num").is_not_null()
    336 )

File /mnt/d/projects/fps/awpy/awpy/awpy/parsers/rounds.py:232, in apply_round_num(df, rounds_df, tick_col)
    205 """Assign a round number to each event based on its tick value.
    206 
    207 For each row in `df`, this function finds the round from `rounds_df`
   (...)
    228     matching round is found, "round_num" will be null.
    229 """
    230 # Use join_asof to get the round where round.start <= event.tick.
    231 # This join will add the columns 'round_num', 'start', and 'end' from rounds_df.
--> 232 df_with_round = df.join_asof(
    233     rounds_df.select(["round_num", "start", "official_end"]),
    234     left_on=tick_col,
    235     right_on="start",
    236     strategy="backward",
    237 )
    239 # Validate that the event tick is within the round boundaries.
    240 # If the tick is greater than the round's 'end', then set round_num to null.
    241 df_with_round = df_with_round.with_columns(
    242     pl.when(pl.col(tick_col) <= pl.col("official_end")).then(pl.col("round_num")).otherwise(None).alias("round_num")
    243 )

File /mnt/d/projects/fps/awpy/awpy/.venv/lib/python3.11/site-packages/polars/dataframe/frame.py:7319, in DataFrame.join_asof(self, other, left_on, right_on, on, by_left, by_right, by, strategy, suffix, tolerance, allow_parallel, force_parallel, coalesce, allow_exact_matches, check_sortedness)
   7297         msg = f"expected `right_on` to be str or Expr, got {type(right_on).__name__!r}"
   7298         raise TypeError(msg)
   7300 return (
   7301     self.lazy()
   7302     .join_asof(
   7303         other.lazy(),
   7304         left_on=left_on,
   7305         right_on=right_on,
   7306         on=on,
   7307         by_left=by_left,
   7308         by_right=by_right,
   7309         by=by,
   7310         strategy=strategy,
   7311         suffix=suffix,
   7312         tolerance=tolerance,
   7313         allow_parallel=allow_parallel,
   7314         force_parallel=force_parallel,
   7315         coalesce=coalesce,
   7316         allow_exact_matches=allow_exact_matches,
   7317         check_sortedness=check_sortedness,
   7318     )
-> 7319     .collect(_eager=True)
   7320 )

File /mnt/d/projects/fps/awpy/awpy/.venv/lib/python3.11/site-packages/polars/lazyframe/frame.py:2066, in LazyFrame.collect(self, type_coercion, _type_check, predicate_pushdown, projection_pushdown, simplify_expression, slice_pushdown, comm_subplan_elim, comm_subexpr_elim, cluster_with_columns, collapse_joins, no_optimization, streaming, engine, background, _check_order, _eager, **_kwargs)
   2064 # Only for testing purposes
   2065 callback = _kwargs.get("post_opt_callback", callback)
-> 2066 return wrap_df(ldf.collect(callback))

InvalidOperationError: argument in operation 'asof_join' is not sorted, please sort the 'expr/series/column' first

If the issue gets fixed simply by just ordering the df by ticks column before returning, then it seems to be simple enough to fix. However, I think it would be ideal to really know why this error is popping up. Regardless this PR looks good to me, but I'll let @pnxenopoulos have a chance to give his thoughts as well.