Allow nested field names to be escaped with backticks.

[gitosaurus]

Change Description

Extends the support of the Pandas backtick convention in eval and query to support nested column and field names. Because the "." operator is used as a path separator in NestedFrame.__setitem__ and NestedFrame.__getitem__, this same convention is followed within those methods to allow users to work around cases when the column name unavoidably contains spaces or dots itself. This context is not a full evaluation context, but when NestedFrame is performing an evaluation, and prepares aliases, these are reused in order to avoid recomputing them.

While this also lays the foundation for supporting more than one level of nesting, this PR does not enable any more than one level of nesting, and continues to follow existing conventions in this case. It does allow users to work with column names having any number of dots or spaces in them by employing backticks.

Closes #176 .

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.43%. Comparing base (a86a532) to head (e247940).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
+ Coverage   99.40%   99.43%   +0.02%     
==========================================
  Files          13       13              
  Lines        1016     1062      +46     
==========================================
+ Hits         1010     1056      +46     
  Misses          6        6              

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[github-actions]

Before [a86a532] <v0.3.2>	After [311b1d8]	Ratio	Benchmark (Parameter)
29.0±0.6ms	30.0±7ms	1.03	benchmarks.ReassignHalfOfNestedSeries.time_run
14.5±0.1ms	14.6±0.09ms	1.01	benchmarks.NestedFrameQuery.time_run
266M	266M	1	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
21.3±0.1ms	21.4±0.1ms	1	benchmarks.AssignSingleDfToNestedSeries.time_run
88.4M	88.4M	1	benchmarks.NestedFrameAddNested.peakmem_run
9.19±0.1ms	9.20±0.1ms	1	benchmarks.NestedFrameAddNested.time_run
93.2M	93.4M	1	benchmarks.NestedFrameQuery.peakmem_run
91.9M	91.9M	1	benchmarks.NestedFrameReduce.peakmem_run
1.59±0.01ms	1.58±0.01ms	1	benchmarks.NestedFrameReduce.time_run
285M	285M	1	benchmarks.ReassignHalfOfNestedSeries.peakmem_run

Click here to view all benchmarks.

[hombit]

Thank you!

[hombit]

This is great, thank you