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After creating and populating tables with CHAR(5) case insensitive columns, in a set of consequent joins like: select * from t1, t2 where t1.c1=t2.c1; select * from t1, t2 where t1.c1=t2.c2; select * from t1, t2 where t1.c2=t2.c1; select * from t1, t2 where t1.c2=t2.c2; only the first join worked reliably case insensitively. Removing the remaining pieces of the code that used order_swap() to compare short CHAR columns, and using Charset::strnncollsp() instead. This fixes the issue.