tvalentyn commented on code in PR #28375:
URL: https://github.com/apache/beam/pull/28375#discussion_r1321813758


##########
sdks/python/apache_beam/dataframe/frames.py:
##########
@@ -917,7 +917,7 @@ def sort_index(self, axis, **kwargs):
   @frame_base.args_to_kwargs(pd.DataFrame)
   @frame_base.populate_defaults(pd.DataFrame)
   @frame_base.maybe_inplace
-  def where(self, cond, other, errors, **kwargs):
+  def where(self, cond, other, **kwargs):

Review Comment:
   I am concerned about removing arguments from method signatures. will these 
be a breaking change for pandas 1.x users ? 
   
   Is `errors` mandatory for pandas 1.x? Note that there are some decorators 
here that manipulate argument lists.
   
   I wonder if we need to add smth like "@frame_base.maybe_errors" or to 
convert the signature to `def where(self, *args, **kwargs):`, and then unpack 
args manually (perhaps with additional verification). 
   
   `args_to_kwargs` should still apply  
https://github.com/apache/beam/blob/30ce4a934298ef6a285d0e9c7991766b3255a9db/sdks/python/apache_beam/dataframe/frame_base.py#L478
 , and might correctly translate args based on Pandas version. 
   
   We can do some extra documentation what args we expect + cleanup TODO later 
when we raise lower bound for Pandas.
   
   



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