[MDEV-32108] Unexpected Results by join_cache_incremental - Jira

Details

Type: Bug
Status: Confirmed (View Workflow)
Priority: Major
Resolution: Unresolved
Affects Version/s: 10.4.31, 11.1.2
Fix Version/s: 11.1(EOL)
Component/s: Optimizer
Labels:
None

Description

The same query returns different results if changing the configuration join_cache_incremental:

CREATE TABLE t0(c0 CHAR(100), c1 FLOAT UNIQUE);

CREATE TABLE t1(c0 CHAR(100), c1 FLOAT UNIQUE);

CREATE TABLE t2(c0 CHAR(100), c1 FLOAT UNIQUE);

INSERT INTO t2 VALUES ('a', 1);

INSERT INTO t1 VALUES ('b', 2);

INSERT INTO t1 VALUES ('', 3);

INSERT INTO t0 VALUES ('', 4);

INSERT INTO t0 VALUES ('c', 5);

SET SESSION optimizer_switch = 'join_cache_incremental=on';

SELECT t1.c1 FROM t2 CROSS JOIN t1 ON TRUE RIGHT JOIN t0 ON t1.c0 IN (t1.c0 REGEXP t1.c0); -- {3}, {3}

SET SESSION optimizer_switch = 'join_cache_incremental=off';

SELECT t1.c1 FROM t2 CROSS JOIN t1 ON TRUE RIGHT JOIN t0 ON t1.c0 IN (t1.c0 REGEXP t1.c0); -- {3}, {NULL}

Attachments

Activity

Daniel Black added a comment - 2023-09-06 02:16

10.4-922db0642b6321ece41adb3232c1616812143573
MariaDB [test]> set statement optimizer_switch = 'join_cache_incremental=on' for SELECT t1.c1 FROM t2 CROSS JOIN t1 ON TRUE RIGHT JOIN t0 ON t1.c0 IN (t1.c0 REGEXP t1.c0);
+------+
\| c1 \|
+------+
\| 3 \|
\| 3 \|
+------+
2 rows in set, 6 warnings (0.001 sec)

MariaDB [test]> show warnings;
+---------+------+-------------------------------------------------------------------------------------------------------------------------------------------+
\| Level \| Code \| Message \|
+---------+------+-------------------------------------------------------------------------------------------------------------------------------------------+
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: 'b ' \|
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: ' ' \|
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: ' ' \|
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: ' ' \|
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: ' ' \|
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: ' ' \|
+---------+------+-------------------------------------------------------------------------------------------------------------------------------------------+
6 rows in set (0.000 sec)

MariaDB [test]> set statement optimizer_switch = 'join_cache_incremental=off' for SELECT t1.c1 FROM t2 CROSS JOIN t1 ON TRUE RIGHT JOIN t0 ON t1.c0 IN (t1.c0 REGEXP t1.c0);
+------+
\| c1 \|
+------+
\| 3 \|
\| NULL \|
+------+
2 rows in set, 5 warnings (0.001 sec)

MariaDB [test]> show warnings;
+---------+------+-------------------------------------------------------------------------------------------------------------------------------------------+
\| Level \| Code \| Message \|
+---------+------+-------------------------------------------------------------------------------------------------------------------------------------------+
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: 'b ' \|
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: ' ' \|
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: ' ' \|
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: 'b ' \|
\| Warning \| 1292 \| Truncated incorrect DECIMAL value: ' ' \|
+---------+------+-------------------------------------------------------------------------------------------------------------------------------------------+
5 rows in set (0.000 sec)

People

Assignee:: Sergei Petrunia

Reporter:: Jinsheng Ba

Votes:: 0 Vote for this issue

Watchers:: 3 Start watching this issue

Dates

Created:: 2023-09-06 02:01

Updated:: 2024-09-10 15:04

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