This patch removes a portion of the last patch to Field_blob::copy
after problems found during testing of tests using distinct operations.


sql/field.h:
  WL#3228 (NDB) : RBR using different table defs on slave/master
    
  This patch removes a portion of the last patch to Field_blob::copy
  after problems found during testing of tests using distinct operations.
  
  The code uses the old version of teh get_length() method.