let queryExpr = {
         $expr:
         {
           $or:
           [
             {$and: [{$eq: ["$a", 8]}, {$eq: ["$b", 70]}]},
             {$and: [{$eq: ["$c", 42.5]}, {$eq: ["$d", 17]}]},
             {$eq: ["$a", 9]}, {$eq: ["$b", 200]}, {$eq: ["$c", 51.2]}, {$eq: ["$d", 400]},
           ]
         }
     };

benchRun({parallel: 1, seconds: 5, ops: [{op:"find", ns:"sbe-perf.LS", query:queryExpr, readCmd: true}]})

[1] filter {let [l19.0 = s39] exists (l19.0) && ! typeMatch (l19.0, 0x00000440) && l19.0 <=> false != 0 && l19.0 <=> 0 != 0}
[1] nlj [s4, s5, s18] [s4, s5, s18]
 left
 [1] filter {s18}
 [1] nlj [s4, s5] [s4, s5]
 left
 [1] scan s4 s5 none none none none [] @"c494dfc1-7ed7-45e7-a46d-b253a1e532db" true false
 right
 [1] limit 1
 [1] union [s18] [
 [s12] [1] project [s12 = true]
 [1] filter {s8}
 [1] limit 1
 [1] union [s8] [
 [s6] [1] project [s6 = false]
 [1] filter {! true}
 [1] limit 1
 [1] coscan ,
 [s7] [1] project [s7 = true]
 [1] limit 1
 [1] coscan
 ] ,
 [s13] [1] project [s13 = true]
 [1] filter {s11}
 [1] limit 1
 [1] union [s11] [
 [s9] [1] project [s9 = false]
 [1] filter {! true}
 [1] limit 1
 [1] coscan ,
 [s10] [1] project [s10 = true]
 [1] limit 1
 [1] coscan
 ] ,
 [s14] [1] project [s14 = true]
 [1] filter {true}
 [1] limit 1
 [1] coscan ,
 [s15] [1] project [s15 = true]
 [1] filter {true}
 [1] limit 1
 [1] coscan ,
 [s16] [1] project [s16 = true]
 [1] filter {true}
 [1] limit 1
 [1] coscan ,
 [s17] [1] project [s17 = true]
 [1] limit 1
 [1] coscan
 ]

 right
 [1] limit 1
 [1] union [s39] [
 [s33] [1] project [s33 = true]
 [1] filter {let [l18.0 = s23] exists (l18.0) && ! typeMatch (l18.0, 0x00000440) && l18.0 <=> false != 0 && l18.0 <=> 0 != 0}
 [1] limit 1
 [1] union [s23] [
 [s21] [1] project [s21 = false]
 [1] filter {! let [l4.0 = let [l1.0 = s19, l1.1 = 8] fillEmpty (l1.0 <=> l1.1 == 0, exists (l1.0) && typeMatch (l1.0, 0xFFFFFFBF) == exists (l1.1) && typeMatch (l1.1, 0xFFFFFFBF))] exists (l4.0) && ! typeMatch (l4.0, 0x00000440) && l4.0 <=> false != 0 && l4.0 <=> 0 != 0}
 [1] project [s19 = getField (s4, "a")]
 [1] limit 1
 [1] coscan ,
 [s22] [1] project [s22 = let [l3.0 = let [l2.0 = s20, l2.1 = 70] fillEmpty (l2.0 <=> l2.1 == 0, exists (l2.0) && typeMatch (l2.0, 0xFFFFFFBF) == exists (l2.1) && typeMatch (l2.1, 0xFFFFFFBF))] exists (l3.0) && ! typeMatch (l3.0, 0x00000440) && l3.0 <=> false != 0 && l3.0 <=> 0 != 0]
 [1] project [s20 = getField (s4, "b")]
 [1] limit 1
 [1] coscan
 ] ,
 [s34] [1] project [s34 = true]
 [1] filter {let [l17.0 = s28] exists (l17.0) && ! typeMatch (l17.0, 0x00000440) && l17.0 <=> false != 0 && l17.0 <=> 0 != 0}
 [1] limit 1
 [1] union [s28] [
 [s26] [1] project [s26 = false]
 [1] filter {! let [l8.0 = let [l5.0 = s24, l5.1 = 42.5] fillEmpty (l5.0 <=> l5.1 == 0, exists (l5.0) && typeMatch (l5.0, 0xFFFFFFBF) == exists (l5.1) && typeMatch (l5.1, 0xFFFFFFBF))] exists (l8.0) && ! typeMatch (l8.0, 0x00000440) && l8.0 <=> false != 0 && l8.0 <=> 0 != 0}
 [1] project [s24 = getField (s4, "c")]
 [1] limit 1
 [1] coscan ,
 [s27] [1] project [s27 = let [l7.0 = let [l6.0 = s25, l6.1 = 17] fillEmpty (l6.0 <=> l6.1 == 0, exists (l6.0) && typeMatch (l6.0, 0xFFFFFFBF) == exists (l6.1) && typeMatch (l6.1, 0xFFFFFFBF))] exists (l7.0) && ! typeMatch (l7.0, 0x00000440) && l7.0 <=> false != 0 && l7.0 <=> 0 != 0]
 [1] project [s25 = getField (s4, "d")]
 [1] limit 1
 [1] coscan
 ] ,
 [s35] [1] project [s35 = true]
 [1] filter {let [l16.0 = let [l9.0 = s29, l9.1 = 9] fillEmpty (l9.0 <=> l9.1 == 0, exists (l9.0) && typeMatch (l9.0, 0xFFFFFFBF) == exists (l9.1) && typeMatch (l9.1, 0xFFFFFFBF))] exists (l16.0) && ! typeMatch (l16.0, 0x00000440) && l16.0 <=> false != 0 && l16.0 <=> 0 != 0}
 [1] project [s29 = getField (s4, "a")]
 [1] limit 1
 [1] coscan ,
 [s36] [1] project [s36 = true]
 [1] filter {let [l15.0 = let [l10.0 = s30, l10.1 = 200] fillEmpty (l10.0 <=> l10.1 == 0, exists (l10.0) && typeMatch (l10.0, 0xFFFFFFBF) == exists (l10.1) && typeMatch (l10.1, 0xFFFFFFBF))] exists (l15.0) && ! typeMatch (l15.0, 0x00000440) && l15.0 <=> false != 0 && l15.0 <=> 0 != 0}
 [1] project [s30 = getField (s4, "b")]
 [1] limit 1
 [1] coscan ,
 [s37] [1] project [s37 = true]
 [1] filter {let [l14.0 = let [l11.0 = s31, l11.1 = 51.2] fillEmpty (l11.0 <=> l11.1 == 0, exists (l11.0) && typeMatch (l11.0, 0xFFFFFFBF) == exists (l11.1) && typeMatch (l11.1, 0xFFFFFFBF))] exists (l14.0) && ! typeMatch (l14.0, 0x00000440) && l14.0 <=> false != 0 && l14.0 <=> 0 != 0}
 [1] project [s31 = getField (s4, "c")]
 [1] limit 1
 [1] coscan ,
 [s38] [1] project [s38 = let [l13.0 = let [l12.0 = s32, l12.1 = 400] fillEmpty (l12.0 <=> l12.1 == 0, exists (l12.0) && typeMatch (l12.0, 0xFFFFFFBF) == exists (l12.1) && typeMatch (l12.1, 0xFFFFFFBF))] exists (l13.0) && ! typeMatch (l13.0, 0x00000440) && l13.0 <=> false != 0 && l13.0 <=> 0 != 0]
 [1] project [s32 = getField (s4, "d")]
 [1] limit 1
 [1] coscan
 ]