I think this has more to do with poor architectural decisions made in
bugzilla. Things like storing the entire ticket history in one big record
instead of normalizing it.
This means you can't do anything to a ticket without munging through 10s of k
of data. This also creates problems when multiple people are trying to update
a single ticket at a time.
--
greg
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
