Count Nested: Fixed Column Ordering

[dougbrn]

Change Description

Resolves #109.

• My PR includes a link to the issue that I am addressing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.43%. Comparing base (307c904) to head (90e6915).
Report is 46 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   99.43%   99.43%           
=======================================
  Files          14       14           
  Lines         888      889    +1     
=======================================
+ Hits          883      884    +1     
  Misses          5        5           

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[github-actions]

Before [307c904]	After [25bb668]	Ratio	Benchmark (Parameter)
31.9±1ms	35.6±2ms	~1.12	benchmarks.AssignSingleDfToNestedSeries.time_run
6.32±0.1ms	6.54±0.09ms	1.03	benchmarks.NestedFrameQuery.time_run
60.3±2ms	62.2±3ms	1.03	benchmarks.ReassignHalfOfNestedSeries.time_run
9.09±0.1ms	9.24±0.9ms	1.02	benchmarks.NestedFrameAddNested.time_run
1.11±0.02ms	1.12±0.01ms	1.01	benchmarks.NestedFrameReduce.time_run
269M	272M	1.01	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
257M	258M	1.00	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
84.4M	84.3M	1.00	benchmarks.NestedFrameAddNested.peakmem_run
87.6M	87.4M	1.00	benchmarks.NestedFrameReduce.peakmem_run
90.7M	88.6M	0.98	benchmarks.NestedFrameQuery.peakmem_run

Click here to view all benchmarks.

[hombit]

Just to be sure it doesn't depend on the value ordering, could you please also make "b" to be a first element in the line 18?