Added "const" to new data for handler::update_row()

This was done to make it clear that a update_row() should not change the
row.
This was not done for handler::write_row() as this function still needs
to update auto_increment values in the row. This should at some point
be moved to handler::ha_write_row() after which write_row can also have
const arguments.

2 files changed, 2 insertions, 2 deletions

diff --git a/storage/blackhole/ha_blackhole.cc b/storage/blackhole/ha_blackhole.cc
index 56d8000d64d..ed9b03dc82b 100644
--- a/storage/blackhole/ha_blackhole.cc
+++ b/storage/blackhole/ha_blackhole.cc
@@ -105,7 +105,7 @@ int ha_blackhole::write_row(uchar * buf)
   DBUG_RETURN(table->next_number_field ? update_auto_increment() : 0);
 }
 
-int ha_blackhole::update_row(const uchar *old_data, uchar *new_data)
+int ha_blackhole::update_row(const uchar *old_data, const uchar *new_data)
 {
   DBUG_ENTER("ha_blackhole::update_row");
   THD *thd= ha_thd();
diff --git a/storage/blackhole/ha_blackhole.h b/storage/blackhole/ha_blackhole.h
index b70320848d7..9a4b34809f8 100644
--- a/storage/blackhole/ha_blackhole.h
+++ b/storage/blackhole/ha_blackhole.h
@@ -97,6 +97,6 @@ public:
                              enum thr_lock_type lock_type);
 private:
   virtual int write_row(uchar *buf);
-  virtual int update_row(const uchar *old_data, uchar *new_data);
+  virtual int update_row(const uchar *old_data, const uchar *new_data);
   virtual int delete_row(const uchar *buf);
 };