minor fix

Author: peter-toth

sql/core/src/test/scala/org/apache/spark/sql/SubquerySuite.scala

@@ -1544,7 +1544,7 @@ class SubquerySuite extends QueryTest with SharedSparkSession {
           assert(countExchange == 2, "Exchange reusing not working correctly")
           assert(countReusedExchange == 3, "Exchange reusing not working correctly")
         } else {
-          assert(countExchange == 5, "expect 4 Exchange when not reusing")
+          assert(countExchange == 5, "expect 5 Exchange when not reusing")
           assert(countReusedExchange == 0,
             "expect 0 ReusedExchangeExec when not reusing")
         }