SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    WithElement (children 1)
     Subquery (children 1)
      SelectWithUnionQuery (children 1)
       ExpressionList (children 1)
        SelectQuery (children 2)
         ExpressionList (children 3)
          Identifier t1.c2
          Identifier t2.c2
          Identifier t2.c3
         TablesInSelectQuery (children 2)
          TablesInSelectQueryElement (children 1)
           TableExpression (children 1)
            TableIdentifier t1
          TablesInSelectQueryElement (children 2)
           TableExpression (children 1)
            TableIdentifier t2
           TableJoin (children 1)
            ExpressionList (children 2)
             Identifier c1
             Identifier c2
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier v1
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier c3
     Literal \'b\'
