Possible patch:
[revin@acme rsandbox_5_6_280]$ diff /usr/bin/pt-table-sync pt-table-sync 4835c4835 < $result .= ' + 0'; --- > $result = "UNIX_TIMESTAMP($result)";
Possible patch:
[revin@acme rsandbox_5_6_280]$ diff /usr/bin/ pt-table- sync pt-table-sync ($result) ";
4835c4835
< $result .= ' + 0';
---
> $result = "UNIX_TIMESTAMP