Fix mysql_info() returning bad data in the results of a multi-statement

query that mixed statements that do and do not return info. (Bug #11688)


mysql-test/r/metadata.result:
  Add new results
mysql-test/t/metadata.test:
  Add new regression test
sql-common/client.c:
  Clear mysql->info in free_old_query()

mysql-test/r/metadata.result

@@ -85,3 +85,14 @@ def			aaa	1	1	8	20	1	N	32769	0	63
 1
 1
 drop table t1;
+create table t1 (i int);
+insert into t1 values (1),(2),(3);
+select * from t1 where i = 2;
+drop table t1;//
+affected rows: 0
+affected rows: 3
+info: Records: 3  Duplicates: 0  Warnings: 0
+i
+2
+affected rows: 1
+affected rows: 0

mysql-test/t/metadata.test

@@ -49,4 +49,16 @@ drop table t1;
 
 --disable_metadata
 
+#
+# Bug #11688: Bad mysql_info() results in multi-results
+#
+--enable_info
+delimiter //;
+create table t1 (i int);
+insert into t1 values (1),(2),(3);
+select * from t1 where i = 2;
+drop table t1;//
+delimiter ;//
+--disable_info
+
 # End of 4.1 tests

sql-common/client.c

@@ -713,8 +713,9 @@ void free_old_query(MYSQL *mysql)
   if (mysql->fields)
     free_root(&mysql->field_alloc,MYF(0));
   init_alloc_root(&mysql->field_alloc,8192,0); /* Assume rowlength < 8192 */
-  mysql->fields=0;
-  mysql->field_count=0;				/* For API */
+  mysql->fields= 0;
+  mysql->field_count= 0;			/* For API */
+  mysql->info= 0;
   DBUG_VOID_RETURN;
 }