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prepared statements." include/hash.h: New declaration for hash_reset() function. The old version was not used. libmysql/client_settings.h: Declaration for mysql_detach_stmt_list(). libmysql/libmysql.c: Fix for bug#5315 "mysql_change_user() doesn't free prepared statements": add call to mysql_detach_stmt_list(prepared statements) to mysql_change_user(): all statements are freed by server, so client counterparts need to be marked as not usable. mysys/hash.c: Fix for bug#5315 "mysql_change_user() doesn't free prepared statements": implementation of hash_reset(), which frees all hash elements and prepares the hash for reuse. sql-common/client.c: Fix for bug#5315 "mysql_change_user() doesn't free prepared statements": implementation of mysql_detach_stmt_list(): zero connection pointer in given statement list, thus marking given statements as not usable. sql/sql_class.cc: Fix for bug#5315 "mysql_change_user() doesn't free prepared statements": reset prepared statements map in THD::change_user(). sql/sql_class.h: Fix for bug#5315 "mysql_change_user() doesn't free prepared statements": implementation of Statement_map::reset(). A little cleanup of ~Statement_map(): first empty names_hash, as st_hash has a free function, which will delete statements. tests/client_test.c: A test case for bug #5315 "mysql_change_user() doesn't free prepared statements".