macroguo-ghy commented on code in PR #3666:
URL: https://github.com/apache/calcite/pull/3666#discussion_r1512203889
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site/_docs/arrow_adapter.md:
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@@ -0,0 +1,89 @@
+---
+layout: docs
+title: Arrow adapter
+permalink: /docs/arrow_adapter.html
+---
+<!--
+{% comment %}
+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.
+{% endcomment %}
+-->
+
+**Note**: Arrow Adapter is an experimental feature;
+changes in public API and usage are expected.
+
+## Overview
+
+Calcite's adapter for Apache Arrow is able to read and process data in Arrow
+format.
+
+It can read files in Arrow's
+[Feather format](https://wesmckinney.com/blog/feather-and-apache-arrow/)
+(which generally have a `.arrow` suffix) in the same way that the
+[File Adapter](file_adapter.html) can read `.csv` files.
+
+The File Adapter immediately translates data to
+[Enumerable format]({{ site.apiRoot
}}/org/apache/calcite/adapter/enumerable/EnumerableConvention.html)
+for further processing, but Arrow is an extremely efficient format for
+processing in-memory data, so the Arrow Adapter has implementations of other
+relational operators for further processing.
Review Comment:
I think we can remove this part, just tell user calcite can read arrow
feature files using SQL
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