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  1. Documentation
  2. DOCS-16458

Investigate changes in SERVER-82204: Classic window functions first/last handle missing field incorrectly

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    Description

      Original Downstream Change Summary

      The $first/$last operator in $setWindowFields will now set null to missing fields to be consistent with $first/$last in $group.

      Description of Linked Ticket

      When the attribute tracked by first/last in the first/last document in the window has a missing attribute the functions return empty results. This is incorrect. According to the documentation they should return null to be consistent with the $group behaviour.

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            caleb.thompson@mongodb.com Caleb Thompson
            backlog-server-pm Backlog - Core Eng Program Management Team
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              Created:
              Updated:
              Resolved:
              12 weeks, 6 days ago