Re: track generic and custom plans in pg_stat_statements

> Attached is my counter-proposal, where I have settled down to four
> categories of PlannedStmt:
> - "standard" PlannedStmt, when going through the planner.
> - internally-generated "fake" PlannedStmt.
> - custom cache
> - generic cache

Thanks for the update! I plan on reviewing this tomorrow.

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Sami