CreateQuery enum_alter_issue (children 3)
 Identifier enum_alter_issue
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration a (children 1)
    DataType Enum8 (children 1)
     ExpressionList (children 2)
      Function equals (children 1)
       ExpressionList (children 2)
        Literal \'one\'
        Literal UInt64_1
      Function equals (children 1)
       ExpressionList (children 2)
        Literal \'two\'
        Literal UInt64_2
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier a
