pg_ctl --volkswagen to detect benchmark runs?
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:P If we had caching (which we won't for v11), I'd say we count how often a certain expression is used and then start to instrument it after a threshold and collect profiling data *just* for that expression. And then optimize just that expression with PGO.
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We have experimented with predicate compilation techniques in PostgreSQL (LLVM-based) and saw promising runtime benefits (e.g. less slot_getattr() calls): http://db.inf.uni-tuebingen.de/staticfiles/publications/compiling-Pg-expressions.pdf … I am truly excited for your recent work on expression compilation in PostgreSQL. Keep it up!
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