CreateQuery alter_ttl (children 3)
 Identifier alter_ttl
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration d (children 1)
    DataType Date
   ColumnDeclaration s (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree
  Identifier d
  ExpressionList (children 1)
   TTLElement (children 1)
    Function plus (children 1)
     ExpressionList (children 2)
      Identifier d
      Function toIntervalMonth (children 1)
       ExpressionList (children 1)
        Literal UInt64_1