Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Not a Bug
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10.5.12, 10.6.4
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None
Description
Create a simple test table, and enable sql_safe_updates:
create table t1(id int primary key, val int);
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insert into t1 values(1,1),(2,2),(3,3);
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set session sql_safe_updates=ON;
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DELETE without WHERE fails now, as expected:
delete from t1;
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-- ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
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DELETE with a simple WHERE 1=1 also fails as expected:
delete from t1 where 1=1;
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-- ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
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Now the following two queries fail, too, even though the primary key column is clearly referenced in them:
delete from t1 where id = id;
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-- ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
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delete from t1 where id is not null;
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ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
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This one does work as expected though:
delete from t1 where id > 0;
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-- Query OK, 3 rows affected (0.001 sec)
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What I assume happening here is that the optimizer already optimized "id = id" and "id IS NOT NULL" away, knowing that these will always return "true" anyway, before the SQL_SAFE_UPDATES does even kick in?
Attachments
Issue Links
- relates to
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- Closed
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