**Reported in Launchpad by Fernando Ipar last update 20-06-2013 17:12:08

If not all input lines have the same # of columns, pt-align omits some. This makes the tool unusable with output from other tools like pt-table-checksum:

localhost ~ $ pt-table-checksum --no-check-binlog-format --ignore-databases percona --replicate-check-only --resume --quiet h=localhost| pt-align
TABLE CHUNK CNT_DIFF CRC_DIFF CHUNK_INDEX LOWER_BOUNDARY UPPER_BOUNDARY
schema1.entities 1 0 1 PRIMARY 2 115990
schema1.entities_wishlist 4 -1 1 idx_entities_id 165532 233284
schema1.entities_status_history 81 0 1 PRIMARY 7812042 7829225

localhost ~ $ pt-table-checksum --no-check-binlog-format --ignore-databases percona --replicate-check-only --resume --quiet h=localhost
Differences on data2.bookdownloader.com
TABLE CHUNK CNT_DIFF CRC_DIFF CHUNK_INDEX LOWER_BOUNDARY UPPER_BOUNDARY
cacti.host 1 0 1
cacti.poller_time 1 0 1
cacti.settings 1 0 1
schema1.entities 1 0 1 PRIMARY 2 115990
schema1.entities_wishlist 4 -1 1 idx_entities_id 165532 233284
schema1.entities_status_history 81 0 1 PRIMARY 7812042 7829225

I think this should be fixed so that either:

• for all input lines, there is an output line, or

• a warning is printed that some lines were omitted