SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk (children 1)
     ColumnsTransformerList (children 1)
      ColumnsReplaceTransformer (children 1)
       ColumnsReplaceTransformer::Replacement (children 1)
        Identifier a
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_replace_main
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier b
