@Test
  public void testSafeQueryTimeForASlowNode() throws Exception {
    IndexManager.resetIndexBufferTime();
    // fake entry update at LMT of 0 and actual time of 10
    // safe query time set in index manager is going to be -10
    IndexManager.setIndexBufferTime(210, 200);

    assertFalse(IndexManager.needsRecalculation(200, 190));
    assertFalse(IndexManager.needsRecalculation(200, 200));
    assertTrue(IndexManager.needsRecalculation(200, 210));

    assertTrue(IndexManager.needsRecalculation(200, 220));
    assertTrue(IndexManager.needsRecalculation(200, 221));

    // now lets say an entry updates with no delta
    IndexManager.setIndexBufferTime(210, 210);

    assertTrue(IndexManager.needsRecalculation(200, 190));
    assertTrue(IndexManager.needsRecalculation(200, 200));
    assertTrue(IndexManager.needsRecalculation(200, 210));

    assertTrue(IndexManager.needsRecalculation(200, 220));
    assertTrue(IndexManager.needsRecalculation(200, 221));

    assertTrue(IndexManager.needsRecalculation(210, 211));
    assertFalse(IndexManager.needsRecalculation(212, 210));
  }
This test is for a fix for #47475 We added a way to determine whether to reevaluate an entry
for query execution The method is to keep track of the delta and current time in a single long
value The value is then used by the query to determine if a region entry needs to be
reevaluated based on subtracting the value with the query execution time. This provides a delta
+ some false positive time If the delta + last modified time of the region entry is > query
start time, we can assume that it needs to be reevaluated
geode-core/src/integrationTest/java/org/apache/geode/cache/query/internal/IndexManagerJUnitTest.java