8346047: JFR: Incorrect percentile value in 'jfr view'

Reviewed-by: mgronlun

Author: egahlin

src/jdk.jfr/share/classes/jdk/jfr/internal/query/Function.java

@@ -89,7 +89,7 @@ public static Function create(Field field) {
             return createPercentile(field, 0.99);
         }
         if (aggregator == Aggregator.P999) {
-            return createPercentile(field, 0.9999);
+            return createPercentile(field, 0.999);
         }
         if (aggregator == Aggregator.MAXIMUM) {
             return new Maximum();
@@ -578,7 +578,7 @@ public Object result() {
             double doubleIndex = (size + 1) * percentile;
             int valueIndex = (int) doubleIndex - 1;
             int valueNextIndex = (int) doubleIndex;
-            double fraction = doubleIndex - valueIndex;
+            double fraction = doubleIndex - (int) doubleIndex;
 
             if (valueIndex < 0) {
                 return numbers.getFirst();