InsertQuery   (children 3)
 Identifier t_enum
 ExpressionList (children 1)
  Identifier x
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Identifier x
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier t_source
    Function in (children 1)
     ExpressionList (children 2)
      Identifier x
      Literal Tuple_(\'hello\', \'world\')
