As it is wrong and confusing to associate any
character set with NULL, @A should be latin2 after this query sequence: SET @A=_latin2'string'; SET @A=NULL; I.e. the second query should not change the charset to the current default value, but should keep the original value assigned during the first query. In order to do it, we don't copy charset from the argument if the argument is NULL and the variable has previously been initialized. mysql-test/r/ps_6bdb.result: t mysql-test/r/ps_5merge.result: t mysql-test/r/ps_3innodb.result: t mysql-test/r/ps_7ndb.result: t mysql-test/r/ps_4heap.result: t mysql-test/r/ps_2myisam.result: t sql/item_func.cc: t
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