@Test
public void testGroupPerformance() throws Exception {
// Apply two different group operations and measure the elapsed time.
long begin = System.nanoTime();
int lookupTimes = 1000;
for (int i = 0; i < lookupTimes; i++) {
dataSetOpEngine.execute(EXPENSE_REPORTS, groupByDeptAndCount.getOperationList());
dataSetOpEngine.execute(EXPENSE_REPORTS, groupByDeptAndSum.getOperationList());
}
long time = System.nanoTime() - begin;
// Check out the resulting stats
DataSetIndex dataSetIndex = dataSetOpEngine.getIndexRegistry().get(EXPENSE_REPORTS);
DataSetIndexStats stats = dataSetIndex.getStats();
DataSet dataSet = dataSetIndex.getDataSet();
System.out.println(stats.toString("\n"));
// Assert the reuse of group operations and aggregate calculations is working.
assertThat(stats.getNumberOfGroupOps()).isEqualTo(1);
assertThat(stats.getNumberOfAggFunctions()).isEqualTo(10);
// The build time should be shorter than the overall lookup time.
assertThat(stats.getBuildTime()).isLessThan(time);
// The reuse rate must reflect the number of times the lookups are being reused.
assertThat(stats.getReuseRate()).isGreaterThanOrEqualTo(lookupTimes - 1);
// The index size must not be greater than the 20% of the dataset's size
assertThat(stats.getIndexSize()).isLessThan(dataSet.getEstimatedSize() / 5);
}
@Before
public void setUp() throws Exception {
DataSet dataSet = RawDataSetSamples.EXPENSE_REPORTS.toDataSet();
dataSet.setUUID(EXPENSE_REPORTS);
dataSetOpEngine.getIndexRegistry().put(dataSet);
}