PS-10110 (8.4) Fix poor MyRocks query plans caused by 1-row range estimates

mysql-test/suite/rocksdb/r/index_merge_rocksdb.result

@@ -34,12 +34,12 @@ Table	Op	Msg_type	Msg_text
 test.t1	analyze	status	OK
 explain select * from t1 where key1 = 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	NULL	ref	key1	key1	5	#	1	100.00	NULL
+1	SIMPLE	t1	NULL	ref	key1	key1	5	#	3	100.00	NULL
 Warnings:
 Note	1003	/* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2`,`test`.`t1`.`key3` AS `key3` from `test`.`t1` where (`test`.`t1`.`key1` = 1)
 explain select key1,key2 from t1 where key1 = 1 or key2 = 1;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	NULL	index_merge	key1,key2	key1,key2	5,5	#	2	100.00	Using union(key1,key2); Using where
+1	SIMPLE	t1	NULL	index_merge	key1,key2	key1,key2	5,5	#	4	100.00	Using union(key1,key2); Using where
 Warnings:
 Note	1003	/* select#1 */ select `test`.`t1`.`key1` AS `key1`,`test`.`t1`.`key2` AS `key2` from `test`.`t1` where ((`test`.`t1`.`key1` = 1) or (`test`.`t1`.`key2` = 1))
 select * from t1 where key1 = 1;

mysql-test/suite/rocksdb/r/records_in_range_dive.result

@@ -0,0 +1,108 @@
+CREATE TABLE t1 (
+i INT PRIMARY KEY AUTO_INCREMENT,
+a INT NOT NULL,
+b INT NOT NULL,
+KEY ka(a),
+KEY kb(b) comment 'cfname=rev:cf1'
+) ENGINE = rocksdb;
+SET @save_dive = @@session.rocksdb_records_in_range_dive_threshold;
+SET SESSION rocksdb_records_in_range_dive_threshold = 10000;
+#
+# Memtable-only: the dive must count the narrow range exactly (200),
+# instead of the pre-fix estimate of 1.
+#
+explain select * from t1 where a = 5000;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	NULL	ref	ka	ka	4	const	200	100.00	NULL
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t1`.`i` AS `i`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`a` = 5000)
+explain select * from t1 where b = 5000;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	NULL	ref	kb	kb	4	const	200	100.00	NULL
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t1`.`i` AS `i`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`b` = 5000)
+explain select * from t1 where a > 4999 and a < 5001;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	NULL	range	ka	ka	4	NULL	200	100.00	Using index condition
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t1`.`i` AS `i`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`a` > 4999) and (`test`.`t1`.`a` < 5001))
+#
+# SST path: flush the memtable; the dive still counts the narrow
+# range exactly.
+#
+set global rocksdb_force_flush_memtable_now = true;
+analyze table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	OK
+explain select * from t1 where a = 5000;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	NULL	ref	ka	ka	4	const	200	100.00	NULL
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t1`.`i` AS `i`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`a` = 5000)
+explain select * from t1 where b = 5000;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	NULL	ref	kb	kb	4	const	200	100.00	NULL
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t1`.`i` AS `i`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`b` = 5000)
+explain select * from t1 where a > 4999 and a < 5001;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	NULL	range	ka	ka	4	NULL	200	100.00	Using index condition
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t1`.`i` AS `i`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`a` > 4999) and (`test`.`t1`.`a` < 5001))
+#
+# An empty range stays at the conventional 1 row.
+#
+explain select * from t1 where a = 9999;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t1	NULL	ref	ka	ka	4	const	1	100.00	NULL
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t1`.`i` AS `i`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`a` = 9999)
+#
+# Deterministic single-block scenario: index kc lives in its own
+# column family whose whole SST fits in one ~16KB data block, so
+# GetApproximateSizes() is guaranteed to return 0 for any range that
+# does not extend past the last key: the exact situation from the
+# bug report.
+#
+CREATE TABLE t2 (
+i INT PRIMARY KEY AUTO_INCREMENT,
+c INT NOT NULL,
+KEY kc(c) comment 'cfname=cf_dive'
+) ENGINE = rocksdb;
+set global rocksdb_force_flush_memtable_now = true;
+analyze table t2;
+Table	Op	Msg_type	Msg_text
+test.t2	analyze	status	OK
+# Dive enabled: exact count (201 keys with c = 50).
+SET SESSION rocksdb_records_in_range_dive_threshold = 10000;
+explain select * from t2 where c = 50;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	NULL	ref	kc	kc	4	const	201	100.00	Using index
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t2`.`i` AS `i`,`test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`c` = 50)
+# Cap semantics: the dive reads at most threshold keys, so a range
+# with more keys than the threshold estimates as the threshold
+# (a lower bound).
+SET SESSION rocksdb_records_in_range_dive_threshold = 50;
+explain select * from t2 where c = 50;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	NULL	ref	kc	kc	4	const	50	100.00	Using index
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t2`.`i` AS `i`,`test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`c` = 50)
+SET SESSION rocksdb_records_in_range_dive_threshold = DEFAULT;
+explain select * from t2 where c = 50;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	NULL	ref	kc	kc	4	const	100	100.00	Using index
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t2`.`i` AS `i`,`test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`c` = 50)
+# 0 disables the dive: legacy behavior, the estimate collapses to
+# 1 row (this is the PS-10110 bug).
+SET SESSION rocksdb_records_in_range_dive_threshold = 0;
+explain select * from t2 where c = 50;
+id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
+1	SIMPLE	t2	NULL	ref	kc	kc	4	const	1	100.00	Using index
+Warnings:
+Note	1003	/* select#1 */ select `test`.`t2`.`i` AS `i`,`test`.`t2`.`c` AS `c` from `test`.`t2` where (`test`.`t2`.`c` = 50)
+SET SESSION rocksdb_records_in_range_dive_threshold = @save_dive;
+DROP TABLE t1;
+DROP TABLE t2;

mysql-test/suite/rocksdb/r/rocksdb.result

@@ -1036,6 +1036,7 @@ rocksdb_rate_limiter_bytes_per_sec	0
 rocksdb_read_free_rpl	OFF
 rocksdb_read_free_rpl_tables	.*
 rocksdb_records_in_range	50
+rocksdb_records_in_range_dive_threshold	100
 rocksdb_reset_stats	OFF
 rocksdb_rollback_on_timeout	OFF
 rocksdb_rpl_skip_tx_api	OFF

mysql-test/suite/rocksdb/t/records_in_range_dive.test

@@ -0,0 +1,113 @@
+--source include/have_rocksdb.inc
+
+# PS-10110: records_in_range() returned 1 row for narrow ranges that fall
+# within a single SST data block (or a narrow memtable range), because
+# RocksDB size approximations work at data block granularity and return 0.
+# The estimate is now refined with a bounded index dive controlled by
+# rocksdb_records_in_range_dive_threshold: an exact key count if the range
+# has fewer keys than the threshold, a lower bound of the threshold
+# otherwise.
+#
+# Note: no FORCE INDEX in the queries below - with FORCE INDEX the SQL
+# layer skips records_in_range() entirely.
+
+CREATE TABLE t1 (
+       i INT PRIMARY KEY AUTO_INCREMENT,
+       a INT NOT NULL,
+       b INT NOT NULL,
+       KEY ka(a),
+       KEY kb(b) comment 'cfname=rev:cf1'
+) ENGINE = rocksdb;
+
+# 20000 rows spread over a = b = 1..1000 (20 rows each), plus exactly 200
+# rows with a = b = 5000.
+--disable_query_log
+let $i = 1;
+while ($i <= 1000) {
+  eval INSERT INTO t1(a, b) VALUES
+      ($i,$i),($i,$i),($i,$i),($i,$i),($i,$i),
+      ($i,$i),($i,$i),($i,$i),($i,$i),($i,$i),
+      ($i,$i),($i,$i),($i,$i),($i,$i),($i,$i),
+      ($i,$i),($i,$i),($i,$i),($i,$i),($i,$i);
+  inc $i;
+}
+let $i = 1;
+while ($i <= 200) {
+  INSERT INTO t1(a, b) VALUES (5000, 5000);
+  inc $i;
+}
+--enable_query_log
+
+SET @save_dive = @@session.rocksdb_records_in_range_dive_threshold;
+SET SESSION rocksdb_records_in_range_dive_threshold = 10000;
+
+--echo #
+--echo # Memtable-only: the dive must count the narrow range exactly (200),
+--echo # instead of the pre-fix estimate of 1.
+--echo #
+explain select * from t1 where a = 5000;
+explain select * from t1 where b = 5000;
+explain select * from t1 where a > 4999 and a < 5001;
+
+--echo #
+--echo # SST path: flush the memtable; the dive still counts the narrow
+--echo # range exactly.
+--echo #
+set global rocksdb_force_flush_memtable_now = true;
+analyze table t1;
+explain select * from t1 where a = 5000;
+explain select * from t1 where b = 5000;
+explain select * from t1 where a > 4999 and a < 5001;
+
+--echo #
+--echo # An empty range stays at the conventional 1 row.
+--echo #
+explain select * from t1 where a = 9999;
+
+--echo #
+--echo # Deterministic single-block scenario: index kc lives in its own
+--echo # column family whose whole SST fits in one ~16KB data block, so
+--echo # GetApproximateSizes() is guaranteed to return 0 for any range that
+--echo # does not extend past the last key: the exact situation from the
+--echo # bug report.
+--echo #
+CREATE TABLE t2 (
+       i INT PRIMARY KEY AUTO_INCREMENT,
+       c INT NOT NULL,
+       KEY kc(c) comment 'cfname=cf_dive'
+) ENGINE = rocksdb;
+--disable_query_log
+let $i = 1;
+while ($i <= 100) {
+  eval INSERT INTO t2(c) VALUES ($i);
+  inc $i;
+}
+let $i = 1;
+while ($i <= 200) {
+  INSERT INTO t2(c) VALUES (50);
+  inc $i;
+}
+--enable_query_log
+set global rocksdb_force_flush_memtable_now = true;
+analyze table t2;
+
+--echo # Dive enabled: exact count (201 keys with c = 50).
+SET SESSION rocksdb_records_in_range_dive_threshold = 10000;
+explain select * from t2 where c = 50;
+
+--echo # Cap semantics: the dive reads at most threshold keys, so a range
+--echo # with more keys than the threshold estimates as the threshold
+--echo # (a lower bound).
+SET SESSION rocksdb_records_in_range_dive_threshold = 50;
+explain select * from t2 where c = 50;
+SET SESSION rocksdb_records_in_range_dive_threshold = DEFAULT;
+explain select * from t2 where c = 50;
+
+--echo # 0 disables the dive: legacy behavior, the estimate collapses to
+--echo # 1 row (this is the PS-10110 bug).
+SET SESSION rocksdb_records_in_range_dive_threshold = 0;
+explain select * from t2 where c = 50;
+
+SET SESSION rocksdb_records_in_range_dive_threshold = @save_dive;
+DROP TABLE t1;
+DROP TABLE t2;

mysql-test/suite/rocksdb_sys_vars/r/rocksdb_records_in_range_dive_threshold_basic.result

@@ -0,0 +1,121 @@
+CREATE TABLE valid_values (value varchar(255)) ENGINE=myisam;
+INSERT INTO valid_values VALUES(1);
+INSERT INTO valid_values VALUES(0);
+INSERT INTO valid_values VALUES(100);
+INSERT INTO valid_values VALUES(222333);
+CREATE TABLE invalid_values (value varchar(255)) ENGINE=myisam;
+INSERT INTO invalid_values VALUES('\'aaa\'');
+INSERT INTO invalid_values VALUES('\'bbb\'');
+SET @start_global_value = @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+SELECT @start_global_value;
+@start_global_value
+100
+SET @start_session_value = @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+SELECT @start_session_value;
+@start_session_value
+100
+'# Setting to valid values in global scope#'
+"Trying to set variable @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD to 1"
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD   = 1;
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+1
+"Setting the global scope variable back to default"
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD = DEFAULT;
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+"Trying to set variable @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD to 0"
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD   = 0;
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+0
+"Setting the global scope variable back to default"
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD = DEFAULT;
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+"Trying to set variable @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD to 100"
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD   = 100;
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+"Setting the global scope variable back to default"
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD = DEFAULT;
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+"Trying to set variable @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD to 222333"
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD   = 222333;
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+222333
+"Setting the global scope variable back to default"
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD = DEFAULT;
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+'# Setting to valid values in session scope#'
+"Trying to set variable @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD to 1"
+SET @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD   = 1;
+SELECT @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+1
+"Setting the session scope variable back to default"
+SET @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD = DEFAULT;
+SELECT @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+"Trying to set variable @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD to 0"
+SET @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD   = 0;
+SELECT @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+0
+"Setting the session scope variable back to default"
+SET @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD = DEFAULT;
+SELECT @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+"Trying to set variable @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD to 100"
+SET @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD   = 100;
+SELECT @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+"Setting the session scope variable back to default"
+SET @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD = DEFAULT;
+SELECT @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+"Trying to set variable @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD to 222333"
+SET @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD   = 222333;
+SELECT @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+222333
+"Setting the session scope variable back to default"
+SET @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD = DEFAULT;
+SELECT @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+'# Testing with invalid values in global scope #'
+"Trying to set variable @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD to 'aaa'"
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD   = 'aaa';
+Got one of the listed errors
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+"Trying to set variable @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD to 'bbb'"
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD   = 'bbb';
+Got one of the listed errors
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+SET @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD = @start_global_value;
+SELECT @@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@global.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+SET @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD = @start_session_value;
+SELECT @@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD;
+@@session.ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+100
+DROP TABLE valid_values;
+DROP TABLE invalid_values;

mysql-test/suite/rocksdb_sys_vars/t/rocksdb_records_in_range_dive_threshold_basic.test

@@ -0,0 +1,20 @@
+--source include/have_rocksdb.inc
+--source include/have_myisam.inc
+
+CREATE TABLE valid_values (value varchar(255)) ENGINE=myisam;
+INSERT INTO valid_values VALUES(1);
+INSERT INTO valid_values VALUES(0);
+INSERT INTO valid_values VALUES(100);
+INSERT INTO valid_values VALUES(222333);
+
+CREATE TABLE invalid_values (value varchar(255)) ENGINE=myisam;
+INSERT INTO invalid_values VALUES('\'aaa\'');
+INSERT INTO invalid_values VALUES('\'bbb\'');
+
+--let $sys_var=ROCKSDB_RECORDS_IN_RANGE_DIVE_THRESHOLD
+--let $read_only=0
+--let $session=1
+--source ../include/rocksdb_sys_var.inc
+
+DROP TABLE valid_values;
+DROP TABLE invalid_values;