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The following known errors or bugs are not fixed in MySQL 4.0 because fixing them would involve changing a lot of code that could introduce other even worse bugs. The bugs are also classified as "not fatal" or "bearable."
UNION, the first SELECT determines the type,
max_length and NULL properties for the resulting
columns. This issue is resolved in MySQL 4.1.1; the property values are based
on the rows from all UNION parts.