CreateQuery alter_ttl (children 3)
 Identifier alter_ttl
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration i (children 1)
    DataType Int
 Storage definition (children 3)
  Function MergeTree
  Identifier i
  ExpressionList (children 1)
   TTLElement (children 1)
    Function toDate (children 1)
     ExpressionList (children 1)
      Literal \'2020-05-05\'