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    Type:Bug 
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    Resolution: Fixed
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    Priority:Major - P3 
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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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        QO 2025-02-03
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        None
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        None
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        None
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        None
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        None
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Enterprise bar> db.foo.find({a:false}).explain();
MongoServerError[HistogramCEFailure]: encountered interval which is unestimatable: [false, false]
Enterprise bar> db.foo.find({a:true}).explain();
MongoServerError[HistogramCEFailure]: encountered interval which is unestimatable: [true, true] 
Note that the histogram contains separate counters for true and false:
trueCount: Long('1'), falseCount: Long('1'),