Bug #119693 column value change after changing INNER to LEFT
Submitted: 16 Jan 6:39 Modified: 16 Jan 8:28
Reporter: Aaditya Dubey Email Updates:
Status: Verified Impact on me:
None 
Category:MySQL Server: Optimizer Severity:S3 (Non-critical)
Version:8.0.44 OS:Any
Assigned to: CPU Architecture:Any

[16 Jan 6:39] Aaditya Dubey
Description:
after changing INNER to LEFT ,col_3’s value change from 1 to NULL

mysql> WITH cte_216 AS (SELECT LOG(ucl2.c1) AS col_1, 1 AS col_2, ucl2.c9 AS col_3, ucl2.c6 AS col_4 FROM t3 AS ucl2 USE INDEX (idx_t3_c15)) (SELECT DISTINCT 1 AS col_1, 1 AS col_2, osd10.col_2 AS col_3, zrc60.c1 AS c3 FROM t1 AS zrc60 INNER JOIN cte_216 AS osd10 ON EXISTS(SELECT rel12.col_1 AS col_1 FROM cte_216 AS rel12 WHERE (zrc60.c4 = rel12.col_1) ORDER BY rel12.col_1 LIMIT 1) ORDER BY zrc60.c1 DESC);
+-------+-------+-------+------+
| col_1 | col_2 | col_3 | c3   |
+-------+-------+-------+------+
|     1 |     1 |     1 | 8644 |
|     1 |     1 |     1 | 6432 |
|     1 |     1 |     1 | 3584 |
|     1 |     1 |     1 | 1986 |
|     1 |     1 |     1 |  954 |
+-------+-------+-------+------+
5 rows in set (0.00 sec)
mysql> WITH cte_216 AS (SELECT LOG(ucl2.c1) AS col_1, 1 AS col_2, ucl2.c9 AS col_3, ucl2.c6 AS col_4 FROM t3 AS ucl2 USE INDEX (idx_t3_c15)) (SELECT DISTINCT 1 AS col_1, 1 AS col_2, osd10.col_2 AS col_3, zrc60.c1 AS c3 FROM t1 AS zrc60 LEFT JOIN cte_216 AS osd10 ON EXISTS(SELECT rel12.col_1 AS col_1 FROM cte_216 AS rel12 WHERE (zrc60.c4 = rel12.col_1) ORDER BY rel12.col_1 LIMIT 1) ORDER BY zrc60.c1 DESC);
+-------+-------+-------+------+
| col_1 | col_2 | col_3 | c3   |
+-------+-------+-------+------+
|     1 |     1 |  NULL | 8644 |
|     1 |     1 |  NULL | 6432 |
|     1 |     1 |  NULL | 3584 |
|     1 |     1 |  NULL | 1986 |
|     1 |     1 |  NULL |  954 |
+-------+-------+-------+------+
5 rows in set (0.00 sec)

How to repeat:
DROP DATABASE IF EXISTS test;
CREATE DATABASE IF NOT EXISTS test;
USE test;
CREATE TABLE t1 (
    c1 INT NOT NULL AUTO_INCREMENT,
    c2 VARCHAR(255) NOT NULL,
    c3 VARCHAR(255) NULL,
    c4 INT NULL,
    c5 DATE NOT NULL,
    c6 VARCHAR(10) NOT NULL,
    PRIMARY KEY (c1)
);
CREATE TABLE t3 (
    c1 INT NOT NULL AUTO_INCREMENT,
    c2 INT NOT NULL,
    c3 INT NOT NULL,
    c4 YEAR NOT NULL,
    c5 TIME NULL,
    c6 TINYINT NULL,
    c7 SMALLINT NULL,
    c8 MEDIUMINT NULL,
    c9 BIGINT NULL,
    c10 LONGTEXT NULL,
    c11 VARCHAR(255) NULL,
    c12 TINYTEXT NULL,
    c13 TINYBLOB NULL,
    c14 SET('x','y','z') NULL,
    c15 TINYINT(1) NULL,
    PRIMARY KEY (c1)
);
INSERT INTO t1 (c1, c2, c3, c4, c5, c6) VALUES (3584, 'sample_AQJP3FCb7PX46hF2d3VoKsPIHtIgzieVgOK1Ue7iSbNProjjh', 'sample_v', 36, '2025-09-07', 'sample_J');
INSERT INTO t1 (c1, c2, c3, c4, c5, c6) VALUES (954, 'sample_0kfPnPKeUjkycwqHxj5OtQ8', 'sample_sQ', 90, '2025-10-10', 'sample_C');
INSERT INTO t1 (c1, c2, c3, c4, c5, c6) VALUES (1986, 'sample_tJaorTY4zIEBbb8IM4auYieeVSd80foFpJh3MIv0Rz8fEgfYthMyHLdUMnlIN6NnP0VoAFBpSEUcHovYpCFbGrC98Y52vXpgXsmsEBDYj6ecgN2JkDh393f4hhIjFLpqffJrE5Z09WtyvK6PT0IcDNjF6S16yhunjPWFxaAbK4Z6', 'sample_bIa5736UIVD92z8u5rQ0PaRpPlOEwroZ4Xoqc4jDp4SiRROqU4u2EvOZZupAHmFPuFcWjOC6V16yTz58i3824l1EdwAgMPAPy9RM2sHerAB3L3eAWFGFd', 68, '2025-04-20', 'sample_KWK');
INSERT INTO t1 (c1, c2, c3, c4, c5, c6) VALUES (6432, 'sample_apUxsuYxJ7yJ6etwr3Sd7Cg7l1JHXVRSgSUF689u4w2greqF3zbivycDbv6qA4Wusopmd80qoDFLGg1ercUJBRyEl0j0aw1JXgj35Pg4JK2lNYBG2UPKBvS3jhsYpkYbhUNtq5zfTal0MXOuOk4CydQWObucwCG1tGcBtxVHzwZf18W2M7Fl2c8AzYVIIn', 'sample_xoju7XvqD9RJhJ2NAoI2KxR5QZdZKDIjrOdN8MahX1k3dJu9UxKIjMzLtBjiMnoN5JxDvSR7bHNsAECcv5onlaOPg4TBQg4yQw6ThZm8lvYZcq9lBqZap4SoxgEZLdQaIflJvl7EcmCUqqRgQEes', 48, '2025-04-28', 'sample_N');
INSERT INTO t1 (c1, c2, c3, c4, c5, c6) VALUES (8644, 'sample_IYRIsvectgAbcVIlfnvNd9kX3FNkOo4kAKKY1BDBLFQpH7ksvMtBllsZK16dP8T7twvH59dyaLTQuKIciaq8hnHB49XU7pS4kDw8Gt9mASD1ylSfvFBVtDNT', 'sample_7K12anyKLHlFNF5tfck9rj0CREpw10By71a2xm7uMRqIH61pLHnO3mXiWV0Ql013c5vK', 37, '2024-11-16', 'sample_8');
INSERT INTO t3 (c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15) VALUES (8417, 9828, 4869, 2023, '2023-01-01 21:39:34', 14, 68, 41, 89, 'sample_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', 'sample_weZoLCxaYRuEbIZSAcw', 'sample_8eD325FzN79CIA1lx3hcxnIVFhKIlbppGhso8TzRvfqzVgovF4texBWt2e15D4TE8uXMELQHhSBEC2wHYIIOfKH8XCNMYbzkX06yuiY1u41mec1TesgBYKV3PW', X'D2A6D881052BECAA90E6BDA5DBAF542830D084', 'y,z', NULL);
INSERT INTO t3 (c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15) VALUES (4582, 4362, 2120, 2003, '2023-01-01 10:35:52', 75, 23, 4, 15, 'sample_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', 'sample_OMHD5WHEEeP825gAmH18ASwpqD0vYvORsqY1JeLMWv1WSXtxcKBge9eMlrt8UeUiKPtnRDLe7zuoeaiI0BBpG6bPMb4748Gm2MMEjEMRdiEm5VkF5QaLxVYgs6sG6EnjckihkivneYHGmNCgBVP9h0idYcjBp08sH7kN7o8xZS6XyAI2A8sln4cm', 'sample_jOWhHNwQUt1uJx2kPyP1w12xx0VmItQqrpMFoAK5Q5hzAwk6IdTs6Zs4O0fk3TBmFAOgiAO9uWZqt4c', X'4FEFAA9A7DEFA08134185EE2B8A908', 'y,x', NULL);
CREATE  INDEX idx_t3_c15 ON t3 (c15);
WITH cte_216 AS (SELECT LOG(ucl2.c1) AS col_1, 1 AS col_2, ucl2.c9 AS col_3, ucl2.c6 AS col_4 FROM t3 AS ucl2 USE INDEX (idx_t3_c15)) (SELECT DISTINCT 1 AS col_1, 1 AS col_2, osd10.col_2 AS col_3, zrc60.c1 AS c3 FROM t1 AS zrc60 INNER JOIN cte_216 AS osd10 ON EXISTS(SELECT rel12.col_1 AS col_1 FROM cte_216 AS rel12 WHERE (zrc60.c4 = rel12.col_1) ORDER BY rel12.col_1 LIMIT 1) ORDER BY zrc60.c1 DESC);
WITH cte_216 AS (SELECT LOG(ucl2.c1) AS col_1, 1 AS col_2, ucl2.c9 AS col_3, ucl2.c6 AS col_4 FROM t3 AS ucl2 USE INDEX (idx_t3_c15)) (SELECT DISTINCT 1 AS col_1, 1 AS col_2, osd10.col_2 AS col_3, zrc60.c1 AS c3 FROM t1 AS zrc60 LEFT JOIN cte_216 AS osd10 ON EXISTS(SELECT rel12.col_1 AS col_1 FROM cte_216 AS rel12 WHERE (zrc60.c4 = rel12.col_1) ORDER BY rel12.col_1 LIMIT 1) ORDER BY zrc60.c1 DESC);
[16 Jan 8:28] Roy Lyseng
Thank you for the bug report.
Verified as described.
[16 Jan 8:28] Roy Lyseng
Thank you for the bug report.
Verified as described.