On 6/3/2024 06:25, Michael Paquier wrote: >> Just to elaborate: the intention was to allow a section to be added to >> every node in the plan containing information from further down and also >> allow this information to propagate upwards. We happen to have buffer >> information right now, but allowing something similar to be added >> dynamically by extending ExplainNode and passing down a callback to >> standard_ExplainOneQuery. > > Or an extra hook at the end of ExplainNode() to be able to append more > information at node level? Not sure if others would agree with that, > though.
That is what I had in mind, yes.
We already discussed EXPLAIN hooks, at least in [1]. IMO, extensions should have a chance to add something to the node explain and the summary, if only because they can significantly influence the planner and executor's behaviour.