Documentation about it:
https://docs.mongodb.com/manual/release-notes/3.6-compatibility/#aggregate-command-and-results
and https://docs.mongodb.com/manual/reference/command/aggregate/#example
---
** [tickets:#8348] Support mongo 3.6+**
**Status:** open
**Milestone:** unreleased
**Created:** Wed Jan 22, 2020 07:13 PM UTC by Dave Brondsema
**Last Updated:** Wed Jan 22, 2020 07:13 PM UTC
**Owner:** nobody
Reported initially at [#7935] this occurs during a project export, probably
other places too:
```
OperationFailure: command SON([('aggregate', u'attachment.files'),
('pipeline', [{'$match': {'_id': {'$in': []}}}, {'$group': {'total_size':
{'$sum': '$length'}, '_id': 'total'}}, {'$project': {'total_size':
{'$divide': ['$total_size', 1000000]}, '_id': 0}}])]) on namespace
project-data.$cmd failed: The 'cursor' option is required, except for
aggregate with the explain argument
```
---
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