Optimizer code cleanups, no logic changes

- Updated comments
- Added some extra DEBUG
- Indentation changes and break long lines
- Trivial code changes like:
  - Combining 2 statements in one
  - Reorder DBUG lines
  - Use a variable to store a pointer that is used multiple times
- Moved declaration of variables to start of loop/function
- Removed dead or commented code
- Removed wrong DBUG_EXECUTE code in best_extension_by_limited_search()

1 files changed, 3 insertions, 3 deletions

diff --git a/sql/sql_update.cc b/sql/sql_update.cc
index f56ec5c83c9..2da95904419 100644
--- a/sql/sql_update.cc
+++ b/sql/sql_update.cc
@@ -833,9 +833,9 @@ int mysql_update(THD *thd,
         table->use_all_columns();
 
       /*
-	We are doing a search on a key that is updated. In this case
-	we go trough the matching rows, save a pointer to them and
-	update these in a separate loop based on the pointer.
+        We are doing a search on a key that is updated. In this case
+        we go trough the matching rows, save a pointer to them and
+        update these in a separate loop based on the pointer.
       */
       explain->buf_tracker.on_scan_init();
       IO_CACHE tempfile;