./build/install/bin/mongod --setParameter featureFlagSbeFull=true --setParameter featureFlagTimeSeriesInSbe=true --setParameter logComponentVerbosity='{query: 5}'
> db.coll.drop()
> db.createCollection("coll", {timeseries: {timeField: "t"}})
> db.coll.insert({t: new Date(), a: 4, b: 7, c: 5})
> db.coll.insert({t: new Date(), a: 2, b: 9, c: 8})
> db.coll.insert({t: new Date(), a: 3, b: 1, c: 6})
..

> db.coll.aggregate([{$project: {a: 1}}, {$match: {a: {$gte: 4}}}, {$count: "x"}]) 

[5] project [s14 = makeBsonObj(MakeObjSpec([x], [x], Closed, RetNothing), null, true, s13)] 
[4] group [s10] [s13 = sum(1)] spillSlots[s12] mergingExprs[sum(s12)] 
[4] block_to_row blocks[s5] row[s11] s8 
[4] project [s10 = null] 
[2] filter {!(valueBlockNone(s8, true))} 
[2] project [s8 = cellFoldValues_F(valueBlockFillEmpty(valueBlockGteScalar(cellBlockGetFlatValuesBlock(s7), 4L), false), s7)] 
[2] ts_bucket_to_cellblock s2 pathReqs[s5 = ProjectPath(Get(_id)/Id), s6 = ProjectPath(Get(a)/Id), s7 = FilterPath(Get(a)/Traverse/Id)] 
[1] filter {
    let [
        l101.0 = traverseP(s1, lambda(l102.0) { traverseP(getField(move(l102.0), \"max\"), lambda(l103.0) { getField(move(l103.0), \"a\") }, 1) }, 1) 
    ] 
    in 
        if (isArray(l101.0) ?: true) 
        then true 
        else (((l101.0 <=> 4L) >= 0) ?: ((exists(l101.0) && typeMatch(l101.0, -65)) >= true)) 
} 
[1] scan s2 s3 none none none none none none lowPriority [s1 = control] @\"be9e4531-c681-4da5-b7db-8326db4ad559\" true false