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Improve comments for row filtering and toast interaction in logical replication. 

Reported-by: Antonin Houska
Author: Amit Kapila
Reviewed-by: Antonin Houska, Ajin Cherian
Discussion: https://postgr.es/m/84638.1649152255@antos
This commit is contained in:
Amit Kapila 2022-04-06 08:20:40 +05:30
parent 17a856d08b
commit 2d09e44d30
1 changed files with 5 additions and 4 deletions
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9
src/backend/replication/pgoutput/pgoutput.c
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@ -1237,10 +1237,11 @@ pgoutput_row_filter(Relation relation, TupleTableSlot *old_slot,
* For inserts, we only have the new tuple.
*
* For updates, we can have only a new tuple when none of the replica
* identity columns changed but we still need to evaluate the row filter
* for new tuple as the existing values of those columns might not match
* the filter. Also, users can use constant expressions in the row filter,
* so we anyway need to evaluate it for the new tuple.
* identity columns changed and none of those columns have external data
* but we still need to evaluate the row filter for the new tuple as the
* existing values of those columns might not match the filter. Also, users
* can use constant expressions in the row filter, so we anyway need to
* evaluate it for the new tuple.
*
* For deletes, we only have the old tuple.
*/