fix case of dictionary column as path for JSON lookup

[davidhewitt]

Fixes #53

The logic was wrong; we were pulling out the dictionary values and then zipping on that, which was just mixing up data and generally incorrect.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 61.53846% with 10 lines in your changes missing coverage. Please review.

Project coverage is 84.08%. Comparing base (6fae049) to head (f048e37).

Files with missing lines	Patch %	Lines
src/common.rs	61.53%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
- Coverage   84.69%   84.08%   -0.62%     
==========================================
  Files          15       15              
  Lines         980      980              
  Branches      980      980              
==========================================
- Hits          830      824       -6     
- Misses        103      109       +6     
  Partials       47       47              

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[davidhewitt]

With this change to the test suite and not the corresponding changes to common.rs, the issue in #53 reproduced as part of the suite.

[samuelcolvin]

Honestly, this is beyond my capacity to review right now, but I trust you.