SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Identifier v
    Function variantElement (children 1)
     ExpressionList (children 2)
      Identifier v
      Literal \'Enum(\\\'a\\\' = 1)\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function format (children 1)
       ExpressionList (children 3)
        Identifier TSV
        Literal \'v Variant(String, UInt32, Enum(\\\'a\\\' = 1))\'
        Literal \'\\\\N\\nstring\\na\\n1\\n2\\naa\'
 Identifier TSV
