Bug#12204

  "CONNECTION is a reserved keyword"
  Allow connection to be used as an ordinary identifier
  Tests included.

mysql-test/r/keywords.result

@@ -16,3 +16,16 @@ select events.binlog from events;
 binlog
 1
 drop table events;
+create table t1 (connection int, b int);
+create procedure p1()
+begin
+declare connection int;
+select max(t1.connection) into connection from t1;
+select concat("max=",connection) 'p1';
+end|
+insert into t1 (connection) values (1);
+call p1();
+p1
+max=1
+drop procedure p1;
+drop table t1;

mysql-test/t/keywords.test

@@ -19,3 +19,25 @@ select events.binlog from events;
 drop table events;
 
 # End of 4.1 tests
+
+
+#
+# Bug#12204 - CONNECTION should not be a reserved word
+#
+
+create table t1 (connection int, b int);
+delimiter |;
+create procedure p1()
+begin
+  declare connection int;
+  select max(t1.connection) into connection from t1;
+  select concat("max=",connection) 'p1';
+end|
+delimiter ;|
+insert into t1 (connection) values (1);
+call p1();
+drop procedure p1;
+drop table t1;
+
+
+# End of 5.0 tests

sql/sql_yacc.yy

@@ -7926,6 +7926,7 @@ keyword_sp:
 	| COMPACT_SYM		{}
 	| COMPRESSED_SYM	{}
 	| CONCURRENT		{}
+	| CONNECTION_SYM	{}
 	| CONSISTENT_SYM	{}
 	| CUBE_SYM		{}
 	| DATA_SYM		{}