andygrove commented on a change in pull request #8224: URL: https://github.com/apache/arrow/pull/8224#discussion_r492069938
########## File path: rust/arrow/README.md ########## @@ -21,10 +21,62 @@ [](https://coveralls.io/github/apache/arrow) +This crate contains a native Rust implementation of the [Arrow columnar format](https://arrow.apache.org/docs/format/Columnar.html). It uses nightly Rust. + +## Developer's guide + +Here you can find general information about this crate's content and its organization. + +### DataType, Field, Schema and RecordBatch + +Every array in Arrow has a data type and a null bitmap, that specifies whether each value is null or not. Review comment: The null bitmap is optional (for arrays that do not contain any null values) but this makes it sound like that always has to be one. ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
