Reranko05 opened a new issue, #49720: URL: https://github.com/apache/arrow/issues/49720
### Describe the enhancement requested The current implementation of `base64_decode` validates characters using `base64_chars.find()` per byte, which results in repeated linear searches. This can be optimized by using a 256-entry lookup table (byte → sextet or invalid marker), allowing validation and decoding in a single pass with O(1) lookup. This was identified during PR review and deferred to a follow-up. Related: #49660 ### Component(s) C++ -- 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]
