florian-jobs opened a new pull request, #2398: URL: https://github.com/apache/systemds/pull/2398
### Summary This PR introduces a new column group `ColGroupDDCLZW` that stores the mapping vector in LZW-compressed form. ### Key design points - `MapToData` is not stored explicitly; only the compressed LZW representation is kept. - Operations that allow sequential access operate directly on `_dataLZW` without full decompression. - For complex or random-access patterns, the implementation falls back to DDC (uncompressed). ### Current status - Core data structure and compression/decompression are in place. - Work in progress on operations that can be implemented via sequential decoding without full materialization. - Work in progress on Performance. Feedback on design and integration is very welcome. -- 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]
