MySQL Internals Manual  /  ...  /  Stored Function Cache

15.6.2 Stored Function Cache

The FUNCTION cache is implemented exactly like the PROCEDURE cache, in the thread member in THD::sp_func_cache.

Note that because THD::sp_proc_cache and THD::sp_func_cache are both invalidated based on the same Cversion counter, executing DROP PROCEDURE happens to invalidate the FUNCTION cache as well, while DROP FUNCTION also invalidates the PROCEDURE cache. In practice, this has no consequences since DDL statements like this are not executed typically while an application is running, only when it is deployed.

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