This column will be used to store the relative path of the file
where a particular event can be found.
Unless the path is stored, BLR will not be able to find an event based
on the gtid if BRL is connected to a node in a Galera cluster and updates
are made to nodes other than that node as in that case, the GTID domain id
and server id, will not identify the correct directory.
The full path is not stored in the column binlog_file as the path
would in that case (without other modifications) be visible to the
client.
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