SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 6)
    Identifier t.a
    Identifier t.u
    Identifier t.s
    Identifier nested.col1
    Identifier nested.col2
    Identifier lc
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier subcolumns