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Type:
Bug
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Resolution: Fixed
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Priority:
Minor - P4
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Affects Version/s: None
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Component/s: None
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None
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Query Optimization
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Fully Compatible
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ALL
The $concatArrays accumulator (added as part of SERVER-16284) suffers from the same issue as SERVER-90597, so it needs a similar fix
db.test.find()
{ "_id" : 0, "n" : 3, "arr" : [ 0 ] }
{ "_id" : 1, "n" : 2, "arr" : [ 1 ] }
{ "_id" : 2, "n" : 1, "arr" : [ 2 ] }
{ "_id" : 3, "n" : 0, "arr" : [ 3 ] }
db.test.aggregate([{$sort: {_id: 1}}, {$bucketAuto: {groupBy: "$n", buckets: 2, output: {foo: {$concatArrays: "$arr"}}}}])
{ "_id" : { "min" : 0, "max" : 2 }, "foo" : [ 3, 2 ] }
{ "_id" : { "min" : 2, "max" : 3 }, "foo" : [ 1, 0 ] }
The order of the elements in the foo arrays should be swapped since the incoming document order is such that the values put into the foo array are increasing.
- related to
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- Closed
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SERVER-16284 Allow for $pushall / $push with $each to allow pushing all elements of array in $group
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- In Code Review
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