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Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Steps To Reproduce:
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Classic engine:

> db.t.insert({a: 1}) WriteResult({ "nInserted" : 1 }) > db.t.aggregate([{$group: {_id: {$and: ["$a", true]}, s: {$sum: "$b"}}}]) { "_id" : true, "s" : 0 }

SBE and featureFlagGroupPushdown on,

> db.t.aggregate([{$group: {_id: {$and: ["$a", true]}, s: {$sum: "$b"}}}])

Hits MONGO_UNREACHABLE in:

{"t":{"$date":"2021-09-27T14:28:38.628+00:00"},"s":"F", "c":"ASSERT", "id":23079, "ctx":"conn1","msg":"Invariant failure","attr":{"expr":"Hit a MONGO_UNREACHABLE!","file":"src/mongo/db/query/sbe_stage_builder_expression.cpp","line":957}}
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Classic engine: > db.t.insert({a: 1}) WriteResult({ "nInserted" : 1 }) > db.t.aggregate([{$group: {_id: {$and: ["$a", true]}, s: {$sum: "$b"}}}]) { "_id" : true, "s" : 0 } SBE and featureFlagGroupPushdown on, > db.t.aggregate([{$group: {_id: {$and: ["$a", true]}, s: {$sum: "$b"}}}]) Hits MONGO_UNREACHABLE in: {"t":{"$date":"2021-09-27T14:28:38.628+00:00"},"s":"F", "c":"ASSERT", "id":23079, "ctx":"conn1","msg":"Invariant failure","attr":{"expr":"Hit a MONGO_UNREACHABLE!","file":"src/mongo/db/query/sbe_stage_builder_expression.cpp","line":957}}
Sprint:
QE 2021-10-04

This is the same symptom as ~~SERVER-60191~~.

causes

SERVER-89090 Remove mention to placeholder ticket SERVER-XXXX from code

duplicates

SERVER-60203 Translation of the groupBy expression of a sugared $group is unimplemented