private void validateHistogram(
final Index index, int expectedColumns, HistogramEntryDescription... entries) {
final IndexStatisticsService statsService = statsService();
if (analyzedIndexes.add(index)) {
ddl()
.updateTableStatistics(
session(),
index.leafMostTable().getName(),
Collections.singleton(index.getIndexName().getName()));
}
if (entries != null) {
IndexStatistics stats = statsService.getIndexStatistics(session(), index);
Histogram histogram = stats.getHistogram(0, expectedColumns);
assertEquals("histogram column count", expectedColumns, histogram.getColumnCount());
List<HistogramEntry> actualEntries = histogram.getEntries();
List<HistogramEntryDescription> expectedList = Arrays.asList(entries);
AssertUtils.assertCollectionEquals("entries", expectedList, actualEntries);
}
}