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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: Aggregation Framework
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Labels:
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Fully Compatible
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ALL
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v3.6, v3.4, v3.2
$pow has issues where a NumberLong base of -1 is used with a NumberLong exponent of a negative odd value.
For example:
Unable to find source-code formatter for language: javascript. Available languages are: actionscript, ada, applescript, bash, c, c#, c++, cpp, css, erlang, go, groovy, haskell, html, java, javascript, js, json, lua, none, nyan, objc, perl, php, python, r, rainbow, ruby, scala, sh, sql, swift, visualbasic, xml, yaml
MongoDB Enterprise > db.v.aggregate({$project: {'a': { $pow: [ NumberLong(-1), NumberLong(-5) ] }, 'b' : { $pow: [ -1, NumberLong(-3) ] } } })
{ "_id" : ObjectId("5a689c791de68d211f6234d6"), "a" : NumberLong(1), "b" : -1 }
Removing the NumberLong from either argument causes the right answer. It seems to be related purely to the return type being NumberLong, though I can confirm there are no issues with positive odd exponents.
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