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CREATE TABLE t1 (id INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
connection node_2;
ALTER TABLE t1 ADD COLUMN f2 INTEGER, LOCK=SHARED;
connection node_1;
INSERT INTO t1 VALUES (2, 2);
SELECT COUNT(*) = 2 FROM t1;
COUNT(*) = 2
1
connection node_2;
INSERT INTO t1 VALUES (3, 3);
SELECT COUNT(*) = 3 FROM t1;
COUNT(*) = 3
1
DROP TABLE t1;
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