yjshen opened a new pull request #1990: URL: https://github.com/apache/arrow-datafusion/pull/1990
# Which issue does this PR close? Part of #944 It's currently and WIP since it relies on a new Arrow release. To be specific, it needs https://github.com/apache/arrow-rs/commit/2bca71e322fcab6c6d93a47ef71638a617e29f6c # Rationale for this change <!-- Why are you proposing this change? If this is already explained clearly in the issue then this section is not needed. Explaining clearly why changes are proposed helps reviewers understand your changes and offer better suggestions for fixes. --> An easier and more feasible way to parallelize parquet file scan. By introducing a new configuration `max_bytes_per_partition` (TODO), we could generate partitions each of desirable size. And likely to scan only part of the row groups from a big parquet file. The file range is passed down to the `parquet` crate and filter row groups according to its position in the parquet file. # What changes are included in this PR? <!-- There is no need to duplicate the description in the issue here but it is sometimes worth providing a summary of the individual changes in this PR. --> # Are there any user-facing changes? <!-- If there are user-facing changes then we may require documentation to be updated before approving the PR. --> Yes, a new configuration to set desirable scan partition size. -- 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]
