MDEV-27243: Estimation for filtered rows less precise ... #7

Added a testcase
MariaDB · Jan 19, 2022 · d3e511d · d3e511d
1 parent 531dd70
commit d3e511d
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diff --git a/mysql-test/main/statistics_json.result b/mysql-test/main/statistics_json.result
@@ -8241,3 +8241,17 @@ analyze select COUNT(*) FROM t1 WHERE a <='bar';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	200	200.00	50.00	50.00	Using where
 drop table t1;
+#
+# MDEV-27243: Estimation for filtered rows less precise ... #7
+# (Testcase only)
+CREATE TABLE t1 (f TIME);
+INSERT INTO t1 SELECT IF(seq%2,'00:00:00',SEC_TO_TIME(seq+7200)) FROM seq_1_to_1000;
+SET histogram_type= JSON_HB;
+ANALYZE TABLE t1 PERSISTENT FOR ALL;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	Engine-independent statistics collected
+test.t1	analyze	status	OK
+ANALYZE SELECT * FROM t1 WHERE f > '00:01:00';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	1000	1000.00	50.00	50.00	Using where
+drop table t1;
diff --git a/mysql-test/main/statistics_json.test b/mysql-test/main/statistics_json.test
@@ -416,3 +416,16 @@ analyze select COUNT(*) FROM t1 WHERE a >='bar';
 analyze select COUNT(*) FROM t1 WHERE a <='bar';
 
 drop table t1;
+
+--echo #
+--echo # MDEV-27243: Estimation for filtered rows less precise ... #7
+--echo # (Testcase only)
+
+CREATE TABLE t1 (f TIME);
+INSERT INTO t1 SELECT IF(seq%2,'00:00:00',SEC_TO_TIME(seq+7200)) FROM seq_1_to_1000;
+
+SET histogram_type= JSON_HB;
+ANALYZE TABLE t1 PERSISTENT FOR ALL;
+ANALYZE SELECT * FROM t1 WHERE f > '00:01:00';
+drop table t1;
+