CreateQuery t (children 3)
 Identifier t
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration server_date (children 1)
    DataType Date
   ColumnDeclaration something (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 2)
    Function toYYYYMM (children 1)
     ExpressionList (children 1)
      Identifier server_date
    Identifier server_date
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier server_date
    Identifier something