**Reported in Launchpad by snowave last update 27-02-2015 18:36:34

the document says

Note that this algorithm will not work if chunking a char column where all the values start with the same character. In that case, the tool will exit and suggest picking a different algorithm.

i have a try

mysql> desc za;
---------------------------+---------------

---------------------------+---------------

1 row in set (0.00 sec)

mysql> select * from za limit 5;
------------

------------

5 rows in set (0.00 sec)

so can found the prefix of a row begins with abcoppose to the document says i think the tool will use nibble ALGORITHM,

1. TableSyncer:5807 8903 Getting best plugin

2. TableSyncer:5809 8903 Trying plugin Chunk

3. TableChunker:3703 8903 Possible chunk indexes in order: un_id

4. TableChunker:3723 8903 Exact chunkable: id on un_id

5. TableChunker:3727 8903 Ordering columns by order in tbl, PK first

6. TableChunker:3740 8903 Chunkable columns: id on un_id

7. TableChunker:3741 8903 Can chunk exactly: 1

8. TableSyncChunk:5028 8903 Can chunk on column id using index un_id

9. TableSyncer:5812 8903 Can sync with Chunk $VAR1 = {

10. chunk_col => 'id',

11. chunk_index => 'un_id'

12. };

you can see, it used chunk algorithm , could explain ?