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MTAR T3D Sessions: What's Missing from PostgreSQL Query Planning?
What should PostgreSQL do when a query plan expects 10 rows and gets 10,000? In this Postgres Wishlist episode, Greg Dostatni and JD explore how better feedback from query execution could help DBAs understand where estimates go wrong.
Greg’s wishlist starts with a plan explorer that would reveal the alternatives PostgreSQL considered but didn’t choose, along with their estimated costs. He also makes the case for adaptive query plans that could reconsider unfinished work when actual row counts differ significantly from estimates. JD questions how much should happen automatically in production…
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