comphead opened a new issue, #15498: URL: https://github.com/apache/datafusion/issues/15498
### Is your feature request related to a problem or challenge? I was following to https://lucumr.pocoo.org/2025/3/23/from-string/ blog where a cheaper way introduced when converting a `String` to `&str` using `transmute_copy`. I tried to check if extra allocations happening for the conversion using https://crates.io/crates/allocation-counter and tbh the crate shows the same number of allocations. But the test below shows interesting timings ``` let mut a: &str = ""; for s in strings { a = s.as_str(); //a = unsafe { transmute_copy(&ManuallyDrop::new(s)) }; } ``` `strings` is 1_000_000 rows of 100 symbols each Conversion using `a = s.as_str();` takes `Converted 1000000 strings in 65.978625ms` Conversion using `transmute_copy` takes `Converted 1000000 strings in 6.238417ms` so 10x faster ### Describe the solution you'd like _No response_ ### Describe alternatives you've considered _No response_ ### Additional context _No response_ -- 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: github-unsubscr...@datafusion.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For additional commands, e-mail: github-h...@datafusion.apache.org
