post-merge fixes for dbug

dbug/dbug.c

@@ -67,6 +67,7 @@
  *      DBUG_EXECUTE_IF
  *      incremental mode (-#+t:-d,info ...)
  *      DBUG_SET, _db_explain_
+ *      thread-local settings
  *
  */
 
@@ -547,6 +548,7 @@ void _db_set_(CODE_STATE *cs, const char *control)
     if (!rel) sign=0;
     c= *control++;
     if (*control == ',') control++;
+    /* XXX when adding new cases here, don't forget _db_explain_ ! */
     switch (c) {
     case 'd':
       if (sign < 0 && control == end)
@@ -857,6 +859,7 @@ int _db_explain_ (CODE_STATE *cs, char *buf, int len)
   op_bool_to_buf('P', cs->stack->flags & PROCESS_ON);
   op_bool_to_buf('r', cs->stack->sub_level != 0);
   op_intf_to_buf('t', cs->stack->maxdepth, MAXDEPTH, TRACING);
+  op_bool_to_buf('T', cs->stack->flags & TIMESTAMP_ON);
   op_bool_to_buf('S', cs->stack->flags & SANITY_CHECK_ON);
 
   *buf= '\0';

sql/set_var.h

@@ -435,12 +435,7 @@ class sys_var_thd_dbug :public sys_var_thd
   bool check(THD *thd, set_var *var);
   SHOW_TYPE type() { return SHOW_CHAR; }
   bool update(THD *thd, set_var *var);
-  void set_default(THD *thd, enum_var_type type)
-  {
-    char buf[256];
-    DBUG_EXPLAIN_INITIAL(buf, sizeof(buf));
-    DBUG_SET(buf);
-  }
+  void set_default(THD *thd, enum_var_type type) { DBUG_POP(); }
   byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *b);
 };