doc: Add better description for rewrite functions in event triggers
There are two functions that can be used in event triggers to get more
details about a rewrite happening on a relation. Both had a limited
documentation:
- pg_event_trigger_table_rewrite_reason() and
pg_event_trigger_table_rewrite_oid() were not mentioned in the main
event trigger section in the paragraph dedicated to the event
table_rewrite.
- pg_event_trigger_table_rewrite_reason() returns an integer which is a
bitmap of the reasons why a rewrite happens. There was no explanation
about the meaning of these values, forcing the reader to look at the
code to find out that these are defined in event_trigger.h.
While on it, let's add a comment in event_trigger.h where the
AT_REWRITE_* are defined, telling to update the documentation when
these values are changed.
Backpatch down to 13 as a consequence of 1ad23335f36b, where this area
of the documentation has been heavily reworked.
Author: Greg Sabino Mullane
Discussion: https://postgr.es/m/CAKAnmmL+Z6j-C8dAx1tVrnBmZJu+BSoc68WSg3sR+CVNjBCqbw@mail.gmail.com
Backpatch-through: 13
Branch
------
REL_15_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/14440d3b07af2241460eb268811cf54f8eee365f
Modified Files
--------------
doc/src/sgml/event-trigger.sgml | 5 +++++
doc/src/sgml/func.sgml | 8 ++++++--
src/include/commands/event_trigger.h | 6 ++++++
3 files changed, 17 insertions(+), 2 deletions(-)
