Bug #17903: cast to char results in binary

The character set was not being properly initialized in CAST() with
  a type like "CHAR(2) BINARY", which resulted in incorrect results or
  even a crash.


mysql-test/r/cast.result:
  Add new results
mysql-test/t/cast.test:
  Add new regression test
sql/sql_yacc.yy:
  Make sure Lex->charset is set to NULL when nothing follows BINARY
  in type declaration.

mysql-test/r/cast.result

@@ -381,3 +381,14 @@ DROP TABLE t1;
 select cast(NULL as decimal(6)) as t1;
 t1
 NULL
+set names latin1;
+select hex(cast('a' as char(2) binary));
+hex(cast('a' as char(2) binary))
+61
+select hex(cast('a' as binary(2)));
+hex(cast('a' as binary(2)))
+6100
+select hex(cast('a' as char(2) binary));
+hex(cast('a' as char(2) binary))
+61
+End of 5.0 tests

mysql-test/t/cast.test

@@ -204,7 +204,19 @@ SELECT CAST(v AS DECIMAL), CAST(tt AS DECIMAL), CAST(t AS DECIMAL),
        CAST(mt AS DECIMAL), CAST(lt AS DECIMAL) from t1;
 
 DROP TABLE t1;
-# Bug @10237 (CAST(NULL DECIMAL) crashes server)
+
+#
+# Bug #10237 (CAST(NULL DECIMAL) crashes server)
 #
 select cast(NULL as decimal(6)) as t1;
 
+
+#
+# Bug #17903: cast to char results in binary
+#
+set names latin1;
+select hex(cast('a' as char(2) binary));
+select hex(cast('a' as binary(2)));
+select hex(cast('a' as char(2) binary));
+
+--echo End of 5.0 tests

sql/sql_yacc.yy

@@ -3089,7 +3089,7 @@ opt_bin_mod:
 	| BINARY { Lex->type|= BINCMP_FLAG; };
 
 opt_bin_charset:
-	/* empty */ { }
+        /* empty */ { Lex->charset= NULL; }
 	| ASCII_SYM	{ Lex->charset=&my_charset_latin1; }
 	| UNICODE_SYM
 	{