Thanks for the shout-out - I'm the author of the base library you listed that can be used to work with the Postgres parser (libpg_query). That said, the tool b

Thanks for the shout-out - I'm the author of the base library you listed that can be used to work with the Postgres parser (libpg_query). That said, the tool being discussed here (pev) is used to interpret EXPLAIN plans, which libpg_query doesn't give you, as its only concerned with the parsing stage, not the planning stage. In order to plan a query you'll need more information from the actual database, including table statistics, config settings and the size of the underlying table :)