(Expression)
ExpressionTransform
  (ReadFromMergeTree)
  ExpressionTransform
    ReplacingSorted 2 → 1
      ExpressionTransform × 2
        MergeTreeInOrder × 2 0 → 1
0	0
1	1
2	2
3	3
4	4
5	5
6	6
(Expression)
ExpressionTransform × 2
  (ReadFromMergeTree)
  ExpressionTransform × 2
    ReplacingSorted × 2 2 → 1
      Copy × 2 1 → 2
        AddingSelector × 2
          ExpressionTransform × 2
            MergeTreeInOrder × 2 0 → 1