AlterQuery  ttl (children 2)
 ExpressionList (children 1)
  AlterCommand MODIFY_COLUMN (children 1)
   ColumnDeclaration s (children 2)
    DataType String
    Function plus (children 1)
     ExpressionList (children 2)
      Identifier d
      Function toIntervalMonth (children 1)
       ExpressionList (children 1)
        Literal UInt64_1
 Identifier ttl