Improved multi-threaded GROUP BY execution - Githubissues

questdb / roadmap

QuestDB Public Roadmap

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Improved multi-threaded GROUP BY execution #57

Open puzpuzpuz opened 6 months ago

puzpuzpuz commented 6 months ago

Currently, GROUP BY queries run in parallel only in a few cases:

Non-keyed GROUP BY with basic aggregate functions, e.g. select sum(value) from t.
Single INT or SYMBOL-keyed GROUP BY with basic aggregate functions, e.g. select int_key, sum(value) from t.

We're going extend the cases where we go with multi-threaded GROUP BY execution and, as a next step, will make SAMPLE BY run parallel.