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MDEV-20169: main.partition_innodb fails in buildbot with wrong result

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The problem is that background statistics can race with statistics update
during INSERT and cause slightly inaccurate `Rows` count in table statistics
(this is deliberate to avoid excessive locking overhead). This was seen as
occasional .result difference in the test.

Mask out the unstable `Rows` column from SHOW TABLE STATUS; the value is not
related to what is being tested in this part of the test case.

Run ANALYZE TABLE before SHOW EXPLAIN to get stable row count in output.

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
This commit is contained in:
Kristian Nielsen
2023-11-28 16:14:47 +01:00
parent ea4bcb9d98
commit 705f7ab620
2 changed files with 13 additions and 6 deletions
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10
mysql-test/main/partition_innodb.result
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@ -203,6 +203,10 @@ INSERT INTO t1 VALUES (100);
ERROR HY000: Table has no partition for value 100
insert INTO t1 VALUES (110);
ERROR HY000: Table has no partition for value 110
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
EXPLAIN PARTITIONS SELECT * FROM t1 WHERE a > 90;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
@ -406,7 +410,7 @@ t1 InnoDB 10 Dynamic 2 8192 16384 0 0 0 NULL Create_time NULL NULL latin1_swedis
insert into t1 values (0), (1), (2), (3);
show table status;
Name Engine Version Row_format Rows Avg_row_length Data_length Max_data_length Index_length Data_free Auto_increment Create_time Update_time Check_time Collation Checksum Create_options Comment Max_index_length Temporary
t1 InnoDB 10 Dynamic 4 4096 16384 0 0 0 NULL Create_time Update_time NULL latin1_swedish_ci NULL partitioned 0 N
t1 InnoDB 10 Dynamic Rows Avg_row_length 16384 0 0 0 NULL Create_time Update_time NULL latin1_swedish_ci NULL partitioned 0 N
drop table t1;
create table t1 (a int auto_increment primary key)
engine = innodb
@ -417,11 +421,11 @@ t1 InnoDB 10 Dynamic 2 8192 16384 0 0 0 1 Create_time NULL NULL latin1_swedish_c
insert into t1 values (NULL), (NULL), (NULL), (NULL);
show table status;
Name Engine Version Row_format Rows Avg_row_length Data_length Max_data_length Index_length Data_free Auto_increment Create_time Update_time Check_time Collation Checksum Create_options Comment Max_index_length Temporary
t1 InnoDB 10 Dynamic 4 4096 16384 0 0 0 5 Create_time Update_time NULL latin1_swedish_ci NULL partitioned 0 N
t1 InnoDB 10 Dynamic Rows Avg_row_length 16384 0 0 0 5 Create_time Update_time NULL latin1_swedish_ci NULL partitioned 0 N
insert into t1 values (NULL), (NULL), (NULL), (NULL);
show table status;
Name Engine Version Row_format Rows Avg_row_length Data_length Max_data_length Index_length Data_free Auto_increment Create_time Update_time Check_time Collation Checksum Create_options Comment Max_index_length Temporary
t1 InnoDB 10 Dynamic 8 2048 16384 0 0 0 9 Create_time Update_time NULL latin1_swedish_ci NULL partitioned 0 N
t1 InnoDB 10 Dynamic Rows Avg_row_length 16384 0 0 0 9 Create_time Update_time NULL latin1_swedish_ci NULL partitioned 0 N
drop table t1;
create table t1 (a int)
partition by key (a)