CreateQuery t0 (children 3)
 Identifier t0
 Columns definition (children 2)
  ExpressionList (children 3)
   ColumnDeclaration c1 (children 1)
    DataType Int64
   ColumnDeclaration c2 (children 1)
    DataType Int64
   ColumnDeclaration c3 (children 1)
    DataType Int64
  ExpressionList (children 1)
   Projection (children 1)
    ProjectionSelectQuery (children 2)
     ExpressionList (children 3)
      Identifier c1
      Identifier c2
      Function sum (children 1)
       ExpressionList (children 1)
        Identifier c3
     ExpressionList (children 2)
      Identifier c2
      Identifier c1
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier c1
    Identifier c2
  Set
