Add 'Extensions List' page to the documentation

docs/source/contributor-guide/architecture.md

@@ -43,20 +43,10 @@ DataFusion. If you can not do what you want with the existing APIs, we would
 welcome you working with us to add new APIs to enable your use case, as
 described in the next section.
 
-## `datafusion-contrib`
-
-While DataFusions comes with enough features "out of the box" to quickly start
-with a working system, it can't include everything useful feature (e.g.
-`TableProvider`s for all data formats). The [`datafusion-contrib`] project
-contains a collection of community maintained extensions that are not part of
-the core DataFusion project, and not under Apache Software Foundation governance
-but may be useful to others in the community. If you are interested adding a
-feature to DataFusion, a new extension in `datafusion-contrib` is likely a good
-place to start. Please [contact] us via github issue, slack, or Discord and
-we'll gladly set up a new repository for your extension.
-
-[`datafusion-contrib`]: https://github.com/datafusion-contrib
-[contact]: ../contributor-guide/communication.md
+Please see the [Extensions] section to find out more about existing DataFusion
+extensions and how to contribute your extension to the community.
+
+[extensions]: ../library-user-guide/extensions.md
 
 ## Creating new Extension APIs
 

docs/source/index.rst

@@ -99,6 +99,7 @@ To get started, see
    :caption: Library User Guide
 
    library-user-guide/index
+   library-user-guide/extensions
    library-user-guide/using-the-sql-api
    library-user-guide/working-with-exprs
    library-user-guide/using-the-dataframe-api

docs/source/library-user-guide/extensions.md

@@ -0,0 +1,64 @@
+<!---
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+
+# Extensions List
+
+DataFusion tries to provide a good set of features "out of the box" to quickly
+start with a working system, but it can't include every useful feature (e.g.
+`TableProvider`s for all data formats).
+
+Thankfully one of the core features of DataFusion is a flexible extension API
+that allows users to extend its behavior at all points. This page lists some
+community maintained extensions available for DataFusion. These extensions are
+not part of the core DataFusion project, and not under Apache Software
+Foundation governance but we list them here to be useful to others in the
+community.
+
+If you know of an available extension that is not listed below, please open a PR
+to add it to this page. If there is some feature you would like to see in
+DataFusion, please consider creating a new extension in the `datafusion-contrib`
+project (see [below](#datafusion-contrib)). Please [contact] us via github issue, slack, or Discord and
+we'll gladly set up a new repository for your extension.
+
+| Name                         | Type              | Description                                                                       |
+| ---------------------------- | ----------------- | --------------------------------------------------------------------------------- |
+| [DataFusion Table Providers] | [`TableProvider`] | Support for `PostgreSQL`, `MySQL`, `SQLite`, `DuckDB`, and `Flight SQL`           |
+| [DataFusion Federation]      | Framework         | Allows DataFusion to execute (part of) a query plan by a remote execution engine. |
+| [DataFusion ORC]             | [`TableProvider`] | [Apache ORC] file format                                                          |
+| [DataFusion JSON Functions]  | Functions         | Scalar functions for querying JSON strings                                        |
+
+[`tableprovider`]: https://docs.rs/datafusion/latest/datafusion/catalog/trait.TableProvider.html
+[datafusion table providers]: https://github.com/datafusion-contrib/datafusion-table-providers
+[datafusion federation]: https://github.com/datafusion-contrib/datafusion-federation
+[datafusion orc]: https://github.com/datafusion-contrib/datafusion-orc
+[apache orc]: https://orc.apache.org/
+[datafusion json functions]: https://github.com/datafusion-contrib/datafusion-functions-json
+
+## `datafusion-contrib`
+
+The [`datafusion-contrib`] project contains a collection of community maintained
+extensions that are not part of the core DataFusion project, and not under
+Apache Software Foundation governance but may be useful to others in the
+community. If you are interested adding a feature to DataFusion, a new extension
+in `datafusion-contrib` is likely a good place to start. Please [contact] us via
+github issue, slack, or Discord and we'll gladly set up a new repository for
+your extension.
+
+[`datafusion-contrib`]: https://github.com/datafusion-contrib
+[contact]: ../contributor-guide/communication.md