Uploaded image for project: 'Core Server'
  1. Core Server
  2. SERVER-44327

Add $first and $last expressions

    XMLWordPrintable

    Details

      Description

      The query team has decided on the following semantics and syntax:

      Name: $first/last

      Evaluates to the value at the first (or last) position in the passed in array. Errors if the passed in value is not an array and not nullish. Evaluates to missing if the array is empty, which is consistent with $arrayElemAt's behavior. Evaluates to null if input is nullish.

      Syntax:

      { $first: <Expression> }
      

        Attachments

          Issue Links

            Activity

              People

              • Votes:
                0 Vote for this issue
                Watchers:
                6 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: