Add preserveNull and preserveEmptyArrays as $unwind options

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    • Type: New Feature
    • Resolution: Incomplete
    • Priority: Minor - P4
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    • Affects Version/s: None
    • Component/s: Aggregation Framework
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      There are many cases in the BI-Connector (and presumably in customer usage) where the distinction between empty and null array fields in an $unwind must be distinguished, e.g., when mimicking SQL left joins using $unwinds.

      Adding these two options would allow for easy distinguishing. For the BI-Connector, we really only need preserveNull, but having the symmetric preserveEmptyArrays could utility.

            Assignee:
            Asya Kamsky
            Reporter:
            Patrick Meredith
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              Created:
              Updated:
              Resolved: