morrySnow commented on code in PR #14293:
URL: https://github.com/apache/doris/pull/14293#discussion_r1022706432
##########
fe/fe-core/src/test/java/org/apache/doris/nereids/stats/FilterEstimationTest.java:
##########
@@ -71,7 +71,9 @@ public void test1() {
FilterEstimation filterEstimation = new FilterEstimation(stat);
StatsDeriveResult expected = filterEstimation.estimate(or);
Assertions.assertTrue(
- Precision.equals((0.5 * 0.1 + 0.1 - 0.5 * 0.1 * 0.1) * 1000,
expected.getRowCount(), 0.01));
+ Precision.equals((0.5 * 0.1 +
FilterEstimation.DEFAULT_EQUALITY_COMPARISON_SELECTIVITY
Review Comment:
plz add comment to explain these magic numbers
##########
fe/fe-core/src/test/java/org/apache/doris/nereids/stats/FilterEstimationTest.java:
##########
@@ -324,4 +326,172 @@ public void test11() {
StatsDeriveResult estimated = filterEstimation.estimate(not);
Assertions.assertEquals(1000 * 7.0 / 10.0, estimated.getRowCount());
}
+
+ //c>100
+ // a is primary-key, a.ndv is reduced
+ // b is normal, b.ndv is not changed
+ // c.selectivity is still 1, but its range becomes half
+ @Test
+ public void test12() {
Review Comment:
need a meaningful name for each test
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