Force to read all unread packets on stmt_close

tests/client_test.c:
  tests for un cleared packets

libmysql/libmysql.c

@@ -5340,22 +5340,42 @@ int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
 */
 static my_bool stmt_close(MYSQL_STMT *stmt, my_bool skip_list)
 {
+  MYSQL *mysql;
   my_bool error= 0;
   DBUG_ENTER("mysql_stmt_close");
 
   DBUG_ASSERT(stmt != 0);
+  
+  mysql= stmt->mysql;
+  if (mysql->status != MYSQL_STATUS_READY)
+  {
+    /* Clear the current execution status */
+    DBUG_PRINT("warning",("Not all packets read, clearing them"));
+    for (;;)
+    {
+      ulong pkt_len;
+      if ((pkt_len= net_safe_read(mysql)) == packet_error)
+        break;
+      if (pkt_len <= 8 && mysql->net.read_pos[0] == 254)
+        break;	
+    }
+    mysql->status= MYSQL_STATUS_READY;
+  }
   if (stmt->state == MY_ST_PREPARE || stmt->state == MY_ST_EXECUTE)
   {
     char buff[4];
     int4store(buff, stmt->stmt_id);
-    error= simple_command(stmt->mysql, COM_CLOSE_STMT, buff, 4, 1);
+    error= simple_command(mysql, COM_CLOSE_STMT, buff, 4, 1);
+  }
+  if (!error)
+  {
+    mysql_free_result(stmt->result);
+    free_root(&stmt->mem_root, MYF(0));
+    if (!skip_list)
+      mysql->stmts= list_delete(mysql->stmts, &stmt->list);
+    mysql->status= MYSQL_STATUS_READY;
+    my_free((gptr) stmt, MYF(MY_WME));
   }
-  mysql_free_result(stmt->result);
-  free_root(&stmt->mem_root, MYF(0));
-  if (!skip_list)
-    stmt->mysql->stmts= list_delete(stmt->mysql->stmts, &stmt->list);
-  stmt->mysql->status= MYSQL_STATUS_READY;
-  my_free((gptr) stmt, MYF(MY_WME));
   DBUG_RETURN(error);
 }
 

tests/client_test.c

@@ -5332,6 +5332,44 @@ static void test_open_direct()
 
   myassert(2 == my_process_result_set(result));
   mysql_stmt_close(stmt);
+
+  /* run a direct query in the middle of a fetch */
+  stmt= mysql_prepare(mysql,"SELECT * FROM test_open_direct",100);
+  mystmt_init(stmt);
+
+  rc = mysql_execute(stmt);
+  mystmt(stmt, rc);
+
+  rc = mysql_fetch(stmt);
+  mystmt(stmt, rc);
+
+  rc = mysql_query(mysql,"INSERT INTO test_open_direct(id) VALUES(20)");
+  myquery_r(rc);
+
+  rc = mysql_stmt_close(stmt);
+  mystmt(stmt, rc);
+
+  rc = mysql_query(mysql,"INSERT INTO test_open_direct(id) VALUES(20)");
+  myquery(rc);
+
+  /* run a direct query with store result */
+  stmt= mysql_prepare(mysql,"SELECT * FROM test_open_direct",100);
+  mystmt_init(stmt);
+
+  rc = mysql_execute(stmt);
+  mystmt(stmt, rc);
+
+  rc = mysql_stmt_store_result(stmt);
+  mystmt(stmt, rc);
+
+  rc = mysql_fetch(stmt);
+  mystmt(stmt, rc);
+
+  rc = mysql_query(mysql,"drop table test_open_direct");
+  myquery(rc);
+
+  rc = mysql_stmt_close(stmt);
+  mystmt(stmt, rc);
 }
 
 /*
@@ -5378,10 +5416,10 @@ static void test_fetch_nobuffs()
   while (mysql_fetch(stmt) != MYSQL_NO_DATA)
   {
     rc++;
-    fprintf(stdout, "\n CURRENT_DATABASE(): %s(%ld)", str[0]);
-    fprintf(stdout, "\n CURRENT_USER()    : %s(%ld)", str[1]);
-    fprintf(stdout, "\n CURRENT_DATE()    : %s(%ld)", str[2]);
-    fprintf(stdout, "\n CURRENT_TIME()    : %s(%ld)", str[3]);
+    fprintf(stdout, "\n CURRENT_DATABASE(): %s", str[0]);
+    fprintf(stdout, "\n CURRENT_USER()    : %s", str[1]);
+    fprintf(stdout, "\n CURRENT_DATE()    : %s", str[2]);
+    fprintf(stdout, "\n CURRENT_TIME()    : %s", str[3]);
   }
   fprintf(stdout, "\n total rows: %d", rc);
   myassert(rc == 1);