Investigate changes in SERVER-46079: $convert should allow any type to be converted to string

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    • Type: Investigation
    • Resolution: Unresolved
    • Priority: Major - P3
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      Original Downstream Change Summary

      Any type can be converted to a string via $convert. See the syntax doc for more details.

      Description of Linked Ticket

      $convert with target type string (aka $toString) should accept all supported bson types. For example, converting an object or an array fails:

      > db.foo.aggregate([{$set: {x: {$toString: {x: 2}}}}])
2020-02-11T14:12:49.418-0500 E  QUERY    [js] uncaught exception: Error: command failed: {
 "ok" : 0,
 "errmsg" : "Failed to optimize pipeline :: caused by :: Unsupported conversion from object to string in $convert with no onError value",
 "code" : 241,
 "codeName" : "ConversionFailure"
} : aggregate failed :

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            Unassigned
            Reporter:
            Backlog - Core Eng Program Management Team
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              Created:
              Updated: