diff options
Diffstat (limited to 'sql/field_conv.cc')
| -rw-r--r-- | sql/field_conv.cc | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/sql/field_conv.cc b/sql/field_conv.cc index 67ef4f95368..d934e8d007a 100644 --- a/sql/field_conv.cc +++ b/sql/field_conv.cc @@ -783,10 +783,12 @@ int field_conv(Field *to,Field *from) ((Field_varstring*)from)->length_bytes == ((Field_varstring*)to)->length_bytes)) { // Identical fields -#ifdef HAVE_valgrind - /* This may happen if one does 'UPDATE ... SET x=x' */ + /* + This may happen if one does 'UPDATE ... SET x=x' + The test is here mostly for valgrind, but can also be relevant + if memcpy() is implemented with prefetch-write + */ if (to->ptr != from->ptr) -#endif memcpy(to->ptr,from->ptr,to->pack_length()); return 0; } |