Dandandan commented on pull request #2124: URL: https://github.com/apache/arrow-datafusion/pull/2124#issuecomment-1083532239
> I'm a bit confused here. Do you mean https://github.com/jorgecarleitao/arrow2/issues/627 chaining expressions and avoid repeated array allocation through Jit？ The goal in that issue is similar yes, but using generated code instead of reusing arrays. The idea is that we can compile the entire loop. The compiled expression `a + b` would roughly compile to something like the following pseudo code: ``` i = 0 while i < length { *item = *a + *b; a += size_a; b += size_b; item += size_item; } ``` Here item is the pointer to items in the target array and a / b are pointing to items in arrays a and b. In this case we only need to allocate one target array, instead of intermediate arrays. -- 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...@arrow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
