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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/09/21 14:03:18 UTC

[GitHub] [arrow] andygrove commented on a change in pull request #8224: ARROW-10044: [Rust] Improved Arrow's README.

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
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@@ -21,10 +21,62 @@
 
 [![Coverage Status](https://coveralls.io/repos/github/apache/arrow/badge.svg)](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.




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