no need to clear statistics data unless we are turning it off

h2/src/main/org/h2/engine/Database.java

@@ -2269,9 +2269,11 @@ public class Database implements DataHandler {
     public void setQueryStatistics(boolean b) {
         queryStatistics = b;
         synchronized (this) {
+            if (!b) {
                 queryStatisticsData = null;
             }
         }
+    }
 
     public boolean getQueryStatistics() {
         return queryStatistics;