==== VARIATION: sbe pipeline: {$match: {a: 1}}, {}
fGVxAGE/AAAAAA==
==== VARIATION: sbe pipeline: {$match: {a: 2}}, {}
fGVxAGE/AAAAAA==
==== VARIATION: sbe pipeline: {$match: {b: 1}}, {}
fGVxAGI/AAAAAA==
==== VARIATION: sbe pipeline: {$match: {$and: [{a: 1}, {b: 1}]}}, {}
fGFuAFtlcQBhPwAAAAAsZXEAYj8BAAAAXQ==
==== VARIATION: sbe pipeline: {$match: {$or: [{a: 1}, {b: 1}]}}, {}
fG9yAFtlcQBhPwAAAAAsZXEAYj8BAAAAXQ==
==== VARIATION: sbe pipeline: {$match: {a: 1}}, {$project: {a: 1}}
fGVxAGE/AAAAAHweAAAAAyRwcm9qZWN0AA8AAAAIX2lkAAEIYQABAAA=
==== VARIATION: sbe pipeline: {$match: {b: 1}}, {$project: {b: 1}}
fGVxAGI/AAAAAHweAAAAAyRwcm9qZWN0AA8AAAAIX2lkAAEIYgABAAA=
==== VARIATION: sbe pipeline: {$match: {$and: [{a: 1}, {b: 1}]}}, {$project: {a: 1, b: 1}}
fGFuAFtlcQBhPwAAAAAsZXEAYj8BAAAAXXwiAAAAAyRwcm9qZWN0ABMAAAAIX2lkAAEIYQABCGIAAQAA
==== VARIATION: sbe pipeline: {$match: {$or: [{a: 1}, {b: 1}]}}, {$project: {a: 1, b: 1}}
fG9yAFtlcQBhPwAAAAAsZXEAYj8BAAAAXXwiAAAAAyRwcm9qZWN0ABMAAAAIX2lkAAEIYQABCGIAAQAA
