How to merge subdocuments during aggregation

[stefan....@googlemail.com]

Dear community,

In my aggregation pipeline I would like to change the document

{

  a : { /* all fields of a */ },

  b : { /* all fields of b */ }

}

to

{

  a : { /* all fields of a */ , b : { /* all fields of b */ }}

}

The aggregation stage shall be generic, i.e. without naming the field names of a nor b explicitly (just all fields, the fields are highly volatile from object to object).

The names "a" and "b" of course are available.

Using new features from 2.6 is okay for me.

[Asya Kamsky]

Unfortunately, I don't think there is a way to do this with aggregation currently.

You can do it with mapReduce but of course that's much slower and more complicated.

Asya

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