Remove object_store references in Readme.md (#7317)

* Remove object_store references in readme.md

* Add object_store as a related crate

Author: alamb

README.md

@@ -21,29 +21,29 @@
 
 Welcome to the [Rust][rust] implementation of [Apache Arrow], the popular in-memory columnar format.
 
-This repo contains the following main components:
+This repository contains the following crates:
 
 | Crate              | Description                                                                  | Latest API Docs                                  | README                            |
 | ------------------ | ---------------------------------------------------------------------------- | ------------------------------------------------ | --------------------------------- |
 | [`arrow`]          | Core functionality (memory layout, arrays, low level computations)           | [docs.rs](https://docs.rs/arrow/latest)          | [(README)][arrow-readme]          |
 | [`arrow-flight`]   | Support for Arrow-Flight IPC protocol                                        | [docs.rs](https://docs.rs/arrow-flight/latest)   | [(README)][flight-readme]         |
-| [`object-store`]   | Support for object store interactions (aws, azure, gcp, local, in-memory)    | [docs.rs](https://docs.rs/object_store/latest)   | [(README)][objectstore-readme]    |
 | [`parquet`]        | Support for Parquet columnar file format                                     | [docs.rs](https://docs.rs/parquet/latest)        | [(README)][parquet-readme]        |
 | [`parquet_derive`] | A crate for deriving RecordWriter/RecordReader for arbitrary, simple structs | [docs.rs](https://docs.rs/parquet-derive/latest) | [(README)][parquet-derive-readme] |
 
 The current development version the API documentation in this repo can be found [here](https://arrow.apache.org/rust).
 
+Note: previously the [`object_store`] crate was also part of this repository,
+but it has been moved to the [arrow-rs-object-store repository]
+
 [apache arrow]: https://arrow.apache.org/
 [`arrow`]: https://crates.io/crates/arrow
 [`parquet`]: https://crates.io/crates/parquet
 [`parquet_derive`]: https://crates.io/crates/parquet-derive
 [`arrow-flight`]: https://crates.io/crates/arrow-flight
-[`object-store`]: https://crates.io/crates/object-store
+[arrow-rs-object-store repository]: https://github.com/apache/arrow-rs-object-store
 
 ## Release Versioning and Schedule
 
-### `arrow` and `parquet` crates
-
 The Arrow Rust project releases approximately monthly and follows [Semantic
 Versioning].
 
@@ -72,21 +72,6 @@ Planned Release Schedule
 [ticket #5368]: https://github.com/apache/arrow-rs/issues/5368
 [semantic versioning]: https://semver.org/
 
-### `object_store` crate
-
-The [`object_store`] crate is released independently of the `arrow` and
-`parquet` crates and follows [Semantic Versioning]. We aim to release new
-versions approximately every 2 months.
-
-[`object_store`]: https://crates.io/crates/object_store
-
-Planned Release Schedule
-
-| Approximate Date | Version  | Notes                                   |
-| ---------------- | -------- | --------------------------------------- |
-| Feb 2025         | `0.12.0` | Major, potentially breaking API changes |
-| Apr 2025         | `0.12.1` | Minor, NO breaking API changes          |
-
 ### Guidelines for `panic` vs `Result`
 
 In general, use panics for bad states that are unreachable, unrecoverable or harmful.
@@ -128,20 +113,18 @@ maintainers.
 
 There are several related crates in different repositories
 
-| Crate                    | Description                                 | Documentation                           |
-| ------------------------ | ------------------------------------------- | --------------------------------------- |
-| [`datafusion`]           | In-memory query engine with SQL support     | [(README)][datafusion-readme]           |
-| [`ballista`]             | Distributed query execution                 | [(README)][ballista-readme]             |
-| [`object_store_opendal`] | Use [`opendal`] as [`object_store`] backend | [(README)][object_store_opendal-readme] |
-| [`parquet_opendal`]      | Use [`opendal`] for [`parquet`] Arrow IO    | [(README)][parquet_opendal-readme]      |
+| Crate               | Description                                                  | Documentation                      |
+| ------------------- | ------------------------------------------------------------ | ---------------------------------- |
+| [`object_store`]    | Object Storage (aws, azure, gcp, local, in-memory) interface | [(README)](object_store-readme)    |
+| [`datafusion`]      | In-memory query engine with SQL support                      | [(README)][datafusion-readme]      |
+| [`ballista`]        | Distributed query execution                                  | [(README)][ballista-readme]        |
+| [`parquet_opendal`] | Use [`opendal`] for [`parquet`] Arrow IO                     | [(README)][parquet_opendal-readme] |
 
 [`datafusion`]: https://crates.io/crates/datafusion
 [`ballista`]: https://crates.io/crates/ballista
-[`object_store_opendal`]: https://crates.io/crates/object_store_opendal
-[`opendal`]: https://crates.io/crates/opendal
-[object_store_opendal-readme]: https://github.com/apache/opendal/blob/main/integrations/object_store/README.md
 [`parquet_opendal`]: https://crates.io/crates/parquet_opendal
 [parquet_opendal-readme]: https://github.com/apache/opendal/blob/main/integrations/parquet/README.md
+[object_store-readme]: https://github.com/apache/arrow-rs-object-store/blob/main/README.md
 
 Collectively, these crates support a wider array of functionality for analytic computations in Rust.
 
@@ -170,18 +153,18 @@ a great place to meet other contributors and get guidance on where to contribute
 The Rust implementation uses [GitHub issues][issues] as the system of record for new features and bug fixes and
 this plays a critical role in the release process.
 
-For design discussions we generally collaborate on Google documents and file a GitHub issue linking to the document.
+For design discussions we generally use GitHub issues.
 
 There is more information in the [contributing] guide.
 
 [rust]: https://www.rust-lang.org/
+[`object_store`]: https://crates.io/crates/object-store
 [arrow-readme]: arrow/README.md
 [contributing]: CONTRIBUTING.md
 [parquet-readme]: parquet/README.md
 [flight-readme]: arrow-flight/README.md
 [datafusion-readme]: https://github.com/apache/datafusion/blob/main/README.md
 [ballista-readme]: https://github.com/apache/datafusion-ballista/blob/main/README.md
-[objectstore-readme]: object_store/README.md
 [parquet-derive-readme]: parquet_derive/README.md
 [issues]: https://github.com/apache/arrow-rs/issues
 [discussions]: https://github.com/apache/arrow-rs/discussions