SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function MAX (children 1)
     ExpressionList (children 1)
      Identifier test_right.a
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_left
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier test_right
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier test_left.b
        Identifier test_right.b
