This is a change to make the bitmap of updated columns available to a
trigger in TriggerData. This is the same idea as was recently done to
generated columns [0]: Generic triggers such as tsvector_update_trigger
can use this information to skip work if the columns they are interested
in haven't changed. With the generated columns change, perhaps this
isn't so interesting anymore, but I suspect a lot of existing
installations still use tsvector_update_trigger. In any case, since I
had already written the code, I figured I post it here. Perhaps there
are other use cases.
[0]:
https://www.postgresql.org/message-id/flat/b05e781a-fa16-6b52-6738-761181204567(at)2ndquadrant(dot)com
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Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services