mqlrun yields inconsistent with mongod when field name is empty

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    • Type: Bug
    • Resolution: Won't Fix
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: None
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    • Query Execution
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      $ ./mqlrun -j -e '[]' empty_field_names.bson # this bson file is attached

      { a: 1 }

      { : 1 }
      { : 2 }

      $ ./mqlrun -j -e '[{$match: {"":1}}]' empty_field_names.bson # no results

       

      $ ./mqlrun -j -e '[{$match: {"a":1}}]' empty_field_names.bson

      { a: 1 }
      Show
      $ ./mqlrun -j -e '[]' empty_field_names.bson # this bson file is attached { a: 1 } { : 1 } { : 2 } $ ./mqlrun -j -e '[{$match: {"":1 }}]' empty_field_names.bson # no results   $ ./mqlrun -j -e '[{$match: {"a":1 }}]' empty_field_names.bson { a: 1 }
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      The empty string ("") is a valid field name in MongoDB and a user can query off of it using a match pipeline stage when running on a mongod. However, if a document is passed to mqlrun with the empty string as a field name, then that field is effectively ignored, rather than queried off of.

      This was discovered while investigating a fix for MHOUSE-3552.

        1. empty_field_names.bson
          0.0 kB
          Shakil Rafi

            Assignee:
            [DO NOT USE] Backlog - Query Execution
            Reporter:
            Shakil Rafi
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              Created:
              Updated:
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