REF: _cython_operation handle values.ndim==1 case up-front

[jbrockmendel]

• closes #xxxx
• tests added / passed
• Ensure all linting tests pass, see here for how to run them
• whatsnew entry

[jreback]

neutralish on perf?

[jbrockmendel]

Yes

[jorisvandenbossche]

This will give a slowdown for ArrayManager, because you are calling itself (_cython_operation) again, which means that everything in the beginning of _cython_operation is repeated, and thus done twice per column (check for numeric dtype, for disallow_invalid_ops, check for extension arrays -> those are already costly when done repeatedly in wide dataframes).

[jbrockmendel]

and thus done twice per column (check for numeric dtype, for disallow_invalid_ops, check for extension arrays -> those are already costly when done repeatedly in wide dataframes).

could move these to after the 1d check

[jorisvandenbossche]

I am not sure that's possible with the dispatching to _ea_wrap_cython_operation, which needs the 1D EA as is, and not reshaped to a 2D array