ARROW-17100: Add example of Arrow 2.0 DataPageV2 compression issue (#80)
* add example of data page v2 data
* feat: add description of file
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diff --git a/data/parquet/README.md b/data/parquet/README.md
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+<!--
+ ~ 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.
+ -->
+
+# Parquet Test Files
+
+| File | Description |
+| --- | --- |
+| ARROW-17100.parquet | Parquet file written by PyArrow 2.0 with DataPageV2 and compressed columns. Prior to PyArrow 3.0, pages were compressed even if the is_compressed flag was 0. This was fixed in ARROW-10353, but for backwards compatibility readers may wish to support such a file. |
\ No newline at end of file
