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Type:
Improvement
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: Aggregation Framework
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Labels:None
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Minor Change
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Query 2017-08-21, Query 2017-09-11, Query 2017-10-02, Query 2017-10-23
A couple string expressions (notably in $substr(Bytes) and $concat) support dates as inputs, but do not include the number of milliseconds:
> db.foo.insert({x: new Date()})
WriteResult({ "nInserted" : 1 })
> db.foo.find()
{ "_id" : ObjectId("56fae3003ef38a5ce210b230"), "x" : ISODate("2016-03-29T20:18:08.339Z") }
> db.foo.aggregate({$project: {x: {$substr: ["$x", 0, 200]}}})
{ "_id" : ObjectId("56fae3003ef38a5ce210b230"), "x" : "2016-03-29T20:18:08" }
We should either fix these places to include the number of milliseconds, or remove support for using these expressions with date types.
One possible way forward is to add a $toString expression (related to SERVER-11400), then remove support and require an explicit conversion instead.
- is documented by
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DOCS-10862 Docs for SERVER-23410: Improve or remove support for dates in string expressions
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- Closed
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- is related to
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SERVER-12970 agg functions which coerceToString do weird things with larger floats
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- Closed
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- related to
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- Closed
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