Bug#13437900 - VALGRIND REPORTS A LEAK FOR REPL_IGNORE_SERVER_IDS

There was memory leak when running some tests on PB2.
The reason of the failure is an early return from change_master()
that was supposed to deallocate a dyn-array.

Fixed with relocating the dyn-array's destructor at ~LEX() that is
the end of the session, per Gleb's patch idea.
Two optimizations were done: the static buffer for the dyn-array to base on,
and the array initialization is called precisely when it's necessary rather than
per each CHANGE-MASTER as before.
 

1 files changed, 7 insertions, 0 deletions

diff --git a/sql/sql_lex.h b/sql/sql_lex.h
index 542e8b42ae2..474fa87495b 100644
--- a/sql/sql_lex.h
+++ b/sql/sql_lex.h
@@ -291,7 +291,9 @@ typedef struct st_lex_master_info
   char *ssl_key, *ssl_cert, *ssl_ca, *ssl_capath, *ssl_cipher;
   char *relay_log_name;
   ulong relay_log_pos;
+  bool repl_ignore_server_ids_inited;
   DYNAMIC_ARRAY repl_ignore_server_ids;
+  typeof(::server_id) repl_ignore_server_ids_static_buffer[4];
 } LEX_MASTER_INFO;
 
 typedef struct st_lex_reset_slave
@@ -2455,6 +2457,11 @@ struct LEX: public Query_tables_list
     destroy_query_tables_list();
     plugin_unlock_list(NULL, (plugin_ref *)plugins.buffer, plugins.elements);
     delete_dynamic(&plugins);
+    if (mi.repl_ignore_server_ids_inited)
+    {
+      delete_dynamic(&mi.repl_ignore_server_ids);
+      mi.repl_ignore_server_ids_inited= false;
+    }
   }
 
   inline bool is_ps_or_view_context_analysis()