# Golden test output of GoldenSbeStageBuilderTest/TestShardFilter
[2] filter {shardFilter(s1, newBsonObj("a", (s4 ?: null)))} 
[1] project [s4 = getField(s3, "a")] 
[1] project [s3 = getElement(s2, 0)] 
[1] virtualscan s2 {[[{"a" : 1, "b" : 2}], [{"a" : 2, "b" : 2}], [{"a" : 3, "b" : 2}]]} 
