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# Scenario 1: Fixes bug 34736760
# 1.1: Redundant
CREATE TABLE t1_redundant (num INT PRIMARY KEY) ROW_FORMAT=REDUNDANT;
# Insert dummy data to increase time taken to complete ALTER rebuild
# Table is inserted with 1, 2, 3, .. , 1000000
SET SESSION cte_max_recursion_depth=10000000;
INSERT INTO t1_redundant WITH RECURSIVE v AS (SELECT 1 AS n UNION ALL SELECT n + 1 FROM v WHERE n <= 1000000) SELECT n FROM v;
ALTER TABLE t1_redundant ADD col INT DEFAULT 1, ALGORITHM=INSTANT;
SELECT * FROM t1_redundant LIMIT 15;
num col
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 1
10 1
11 1
12 1
13 1
14 1
15 1
# Prepare the new instant column
ALTER TABLE t1_redundant DROP PRIMARY KEY, ADD PRIMARY KEY (num, col);
# Run the DML in online
DELETE FROM t1_redundant WHERE num=1;
SELECT * FROM t1_redundant LIMIT 15;
num col
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 1
10 1
11 1
12 1
13 1
14 1
15 1
16 1
SHOW CREATE TABLE t1_redundant;
Table Create Table
t1_redundant CREATE TABLE `t1_redundant` (
`num` int NOT NULL,
`col` int NOT NULL DEFAULT '1',
PRIMARY KEY (`num`,`col`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci ROW_FORMAT=REDUNDANT
CHECK TABLE t1_redundant EXTENDED;
Table Op Msg_type Msg_text
test.t1_redundant check status OK
DROP TABLE t1_redundant;
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