Add chDB unique formats

auxten · auxten · commit cfc04c8b728e · 2024-01-11T17:07:55.000+08:00
diff --git a/docs/_sidebar.md b/docs/_sidebar.md
@@ -1,6 +1,6 @@
 <!-- docs/_sidebar.md -->
 
-* [About chdb](/)
+* [About chDB](/)
 * Documentation
   * [Installation](install.md)
   * [Data Formats](formats.md)
@@ -24,12 +24,11 @@
   * [Libchdb](https://github.com/chdb-io/chdb)
 * Integrations
   * [JupySQL](https://jupysql.ploomber.io/en/latest/integrations/chdb.html)
-  * [chdb-server](https://github.com/chdb-io/chdb-server)
   * [chdb-lambda](https://github.com/chdb-io/chdb-lambda)
   * [chdb-cli](https://github.com/chdb-io/chdb-cli)
 * External Links
   * [Discord](https://discord.gg/Njw5YXSPPc)
-  * [Birth of chdb](https://auxten.com/the-birth-of-chdb/)
-  * [ClickHouse & chdb](https://clickhouse.com/blog/welcome-chdb-to-clickhouse)
+  * [Birth of chDB](https://auxten.com/the-birth-of-chdb/)
+  * [ClickHouse & chDB](https://clickhouse.com/blog/welcome-chdb-to-clickhouse)
   * [Team & Contributors](https://github.com/chdb-io/chdb#contributors)
-  * [Sponsor chdb 💛](https://github.com/sponsors/chdb-io)
+  * [Sponsor chDB 💛](https://github.com/sponsors/chdb-io)
diff --git a/docs/formats.md b/docs/formats.md
@@ -2,16 +2,22 @@
 
 # Data Formats
 
-| chdb is 100% feature compatible with ClickHouse 🚀
+| chDB is 100% feature compatible with ClickHouse 🚀
 
 Please refer to the [ClickHouse SQL Documentation](https://clickhouse.com/docs/en/sql-reference) for further information and examples.
 
-Just like ClickHouse, chdb can accept and return data in various formats. 
+Just like ClickHouse, chDB can accept and return data in various formats. 
 
 - Input formats are used to parse the data provided to `INSERT` and `SELECT` from a file-backed table such as File, URL or S3. 
 - Output formats are used to arrange the results of a `SELECT`, and to perform `INSERT`s into a file-backed table.
 
-The supported data formats are:
+Besides all the data formats that ClickHouse supported, chDB also support:
+
+- `ArrowTable` as output format, the type is Python `pyarrow.Table`
+- `DataFrame` as input and output format, the type is Python `pandas.DataFrame`. For examples see [test_joindf.py](https://github.com/chdb-io/chdb/blob/main/tests/test_joindf.py)
+- `Debug` as output, it's an alias of `CSV`. But it will enable debug verbose output of ClickHouse Engine.
+
+The supported data formats from ClickHouse engine are:
 
 | Format                                                                                    | Input | Output |
 |-------------------------------------------------------------------------------------------|------|-------|
