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0fb6b044e0
resulted in a wrong error message. The nest_level counter indicates the depth of nesting for a subselect. It is needed to properly resolve aggregate functions in nested subselects. Obviously it shouldn't be incremented for UNION parts because they have the same level of nesting. This counter was incremented by 1 in the mysql_new_select() function for any new select and wasn't decremented for UNION parts. This resulted in wrongly reported error messages. Now the nest_level counter is decremented by 1 for any union part.
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