This worklog provides the feature - partial update of large objects (BLOBs).
When a BLOB is inserted in InnoDB, an LOB index is created to keep track of
different portions of the large object. Using this LOB index, a small portion
of the BLOB can be modified.

Previously, any update on BLOBs will result in the new insertion of the full
BLOB. This worklog makes it possible to partially update a BLOB.