[GitHub] [arrow] jduo commented on a change in pull request #12573: ARROW-15721: [Docs][FlightSQL] Add Flight/Flight SQL to subprojects

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jduo commented on a change in pull request #12573:
URL: https://github.com/apache/arrow/pull/12573#discussion_r820232286



##########
File path: docs/source/format/FlightSql.rst
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@@ -0,0 +1,159 @@
+.. 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.
+
+.. _flight-sql:
+
+================
+Arrow Flight SQL
+================
+
+Arrow Flight SQL is a protocol for interacting with SQL databases
+using the Arrow in-memory format and the :doc:`Flight RPC
+<./Flight>` framework.
+
+Generally, a database will implement the RPC methods according to the
+specification, but does not need to implement a client-side driver. A
+database client can use the provided Flight SQL client to interact
+with any database that supports the necessary endpoints.
+
+.. warning:: Flight SQL is **experimental** and changes to the
+             protocol may still be made.
+
+RPC Methods
+===========
+
+Flight SQL reuses the predefined RPC methods in Arrow Flight, and
+provides various commands that pair those methods with request/response
+messages defined via Protobuf (see below).
+
+SQL Metadata
+------------
+
+Flight SQL provides a variety of commands to fetch metadata about the

Review comment:
       ```suggestion
   Flight SQL provides a variety of commands to fetch catalog metadata about the
   ```




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