CreateQuery column_swap_test_test (children 3)
 Identifier column_swap_test_test
 Columns definition (children 2)
  ExpressionList (children 3)
   ColumnDeclaration i (children 1)
    DataType Int64
   ColumnDeclaration a (children 1)
    DataType String
   ColumnDeclaration b (children 1)
    DataType String
  ExpressionList (children 1)
   Constraint (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier a
      Function substring (children 1)
       ExpressionList (children 3)
        Function reverse (children 1)
         ExpressionList (children 1)
          Identifier b
        Literal UInt64_1
        Literal UInt64_1
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Identifier i
  Set