Comment 8 for bug 918056

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Przemek (pmalkowski) wrote : Re: pt-table-sync can't nibble table because MySQL chose no index

I have fully reproducible case here.
To repeat the problem, load the history_master.sql table to master node, then history_slave.sql to slave node. Slave will have slightly more rows then master.
Then on master:
pt-table-checksum --databases=drupal
pt-table-sync --execute --print --replicate percona.checksums localhost

Also included full query log from pt-table-sync session as well as the tool's debug log.