在mysql中utf8_bin与utf8_general_ci排序的性能影响是什么？

I am working on a database, where the collation for all text fields seems to be utf8_general_ci. There are cases where primary and foreign keys are collated utf8_general_ci (such as a session_id ). Does it degrade performance to use a case-insenstive collation on columns where binary comparisons are fine?I am working on a database, where the collation