Yield the same order regardless of order in the file and database

[ViacheslavP]

Sorry in advance for formulating a possible bug in a form of PR.

I receive different results on chi_square for these 2 configurations (with postgres):

...
distribution_type: categorical
distribution_reference:
  weights:
  - 0.4
  - 0.6
  bins:
  - A
  - B

...
distribution_type: categorical
distribution_reference:
  weights:
  - 0.6
  - 0.4
  bins:
  - B
  - A

I would expect not to.

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