Hello everyone, Weekly Report for 7th week of gsoc 1Now we can alter blob columns query like create table t1(abc blob unique); alter table t1 change column abc a blob; Even we can some multiple changes in one alter create table t1(abc blob unique, xyz blob unique); alter table t1 change column abc a blob , change xyz x blob; Works. 2.Now we can delete blob columns if only one blob unique in key then db_row_hash_ will be removed other wise hash_str will be modified.If the query fails then there will be no side effect 3.chaning of delete operations create table t1(abc blob , xyz blob , pqr blob, unique(abc,xyz,pqr)); alter table t1 drop column abc, drop column xyz; 4. we will get right error message instead of duplicate hash 5. these was an glich in code when we try to add db_row_hash_ column to table with first key work mysql_prepare_alter_table select this instead of real hash now solved. 6. Added some test case.Will add more soon. @Sergei will reply to you soon. Regards sachin