> To track executed plan types, I think execution layer hooks
> are appropriate.
> These hooks, however, take QueryDesc as a param and it does
> not include cached plan information.

It seems that the same QueryDesc entry is reused when executing
a generic plan.
For exemple marking queryDesc->plannedstmt->queryId (outside 
pg_stat_statements) with a pseudo tag during ExecutorStart 
reappears in later executions with generic plans ...

Is this QueryDesc reusable by a custom plan ? If not maybe a solution
could be to add a flag in queryDesc->plannedstmt ?

(sorry, I haven't understood yet how and when this generic plan is 
managed during planning)

Regards
PAscal



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