Details
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Bug
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Resolution: Won't Fix
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Major - P3
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None
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4.3.1
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Query
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ALL
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50
Description
When a 4.2 mongos receives a returnKey() query, it appends an indexKey meta projection on a field "$$"
That is:
{"$$": {$meta: ...}}
|
"$$" is an illegal field name in 4.4, so mongods version 4.4, so when run in a mixed cluster, these queries will uassert().