CreateQuery tt (children 3)
 Identifier tt
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType Int64
   ColumnDeclaration ts (children 1)
    DataType DateTime
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Function dateTrunc (children 1)
   ExpressionList (children 2)
    Literal \'hour\'
    Identifier ts
  Set
