SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 3)
    Identifier t1.a
    Identifier t2.b
    Identifier t3.b
   TablesInSelectQuery (children 3)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t2
     TableJoin
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t3
     TableJoin
   Function and (children 1)
    ExpressionList (children 2)
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier t1.b
       Identifier t2.b
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier t1.b
       Identifier t3.b
