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create table bug53290 (x bigint) engine=innodb;
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insert into bug53290 () values (),(),(),(),(),(),(),(),(),(),(),();
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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insert into bug53290 select * from bug53290;
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alter table bug53290 add unique index `idx` (x);