yaooqinn opened a new pull request, #54140: URL: https://github.com/apache/spark/pull/54140
### What changes were proposed in this pull request? This PR adds a new optimizer rule that converts cross joins with `array_contains` filter into efficient inner joins using explode. This transforms: ```sql SELECT * FROM orders, items WHERE array_contains(orders.item_ids, items.id) ``` From O(N×M) cross join + filter to O(N+M) inner join: ```sql SELECT * FROM (SELECT *, explode(array_distinct(item_ids)) as _unnested FROM orders) t, items WHERE t._unnested = items.id ``` ### Why are the changes needed? Cross joins with `array_contains` are common patterns that can be very expensive for large datasets. This optimization provides 10-15X speedup on realistic workloads. ### Does this PR introduce _any_ user-facing change? No, this is an internal optimizer improvement. ### How was this patch tested? - Unit tests: 15 tests covering basic transformation, type support, and edge cases - Microbenchmark: 10K×1K dataset showing ~10-15X speedup ### Was this patch authored or co-authored using generative AI tooling? Yes, GitHub Copilot CLI assisted with implementation. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
