Bug#30904 SET PASSWORD statement is non-transactional

The SET PASSWORD statement is non-transactional (no explicit transaction
boundaries) in nature and hence is forbidden inside stored functions and
triggers, but it weren't being effectively forbidden.

The implemented fix is to issue a implicit commit with every SET PASSWORD
statement, effectively prohibiting these statements in stored functions
and triggers. 


mysql-test/r/sp-error.result:
  Add test case result for Bug#30904
mysql-test/t/sp-error.test:
  Add test case for Bug#30904
sql/sql_lex.h:
  Add variable to set that a statement with SET PASSWORD causes a implicit
  commit.
sql/sql_parse.cc:
  End active transaction in SET PASSWORD.
sql/sql_yacc.yy:
  Set the correct flag on SET PASSWORD if inside a SP, thus effectively
  prohibiting SET PASSWORD statements in stored functions and triggers.

1 files changed, 10 insertions, 0 deletions

diff --git a/mysql-test/r/sp-error.result b/mysql-test/r/sp-error.result
index 1b14d75cd9c..300fa42f3ad 100644
--- a/mysql-test/r/sp-error.result
+++ b/mysql-test/r/sp-error.result
@@ -1523,3 +1523,13 @@ ERROR 42000: You have an error in your SQL syntax; check the manual that corresp
 SELECT ..inexistent();
 ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.inexistent()' at line 1
 USE test;
+create function f1() returns int
+begin
+set @test = 1, password = password('foo');
+return 1;
+end|
+ERROR HY000: Not allowed to set autocommit from a stored function or trigger
+create trigger t1
+before insert on t2 for each row set password = password('foo');
+delimiter ;|
+ERROR HY000: Not allowed to set autocommit from a stored function or trigger