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There may be times when the index of an array element is interesting. $unwind
could provide an option to emit this. For example

instead of just

db.runCommand({ aggregate:"c", pipeline:[
    { $unwind: "$arrayField"}
]});

consider also supporting something like this:

db.runCommand({ aggregate:"c", pipeline:[
    { $unwind: { path: "$arrayField", includeArrayIndex: boolean }}
]});

The effect of this is the same except that it also adds a new field index
to the output which is assigned the index of the array element.

depends on

DRIVERS-234 Aggregation Builder Support for 3.2

is depended on by

CSHARP-1433 Add option to $unwind to emit array index

JAVA-1995 Add option to $unwind to emit array index

is duplicated by

SERVER-14565 New aggregation operators

is related to

SERVER-20595 Unwind with includeArrayIndex produces different structure results for arrays and non-arrays

Assignee:: Charlie Swanson
Reporter:: Daniel Pasette (Inactive)
Participants:: Charlie Swanson, Daniel Pasette, Githook User, John A. De Goes, Oliver Yeh, Ryan Brothers
Votes:: 19 Vote for this issue
Watchers:: 17 Start watching this issue