update readme

README.md

@@ -94,17 +94,17 @@ Read our [announcement on Hybrid Execution] for more information.
 
 1. Install the official [GlareDB Python library]
 
-     ```shell
-     pip install glaredb
-     ```
+   ```shell
+   pip install glaredb
+   ```
 
 2. Import and use `glaredb`.
 
-     ```python
-     import glaredb
-     con = glaredb.connect()
-     con.sql("select 'hello world';").show()
-     ```
+   ```python
+   import glaredb
+   con = glaredb.connect()
+   con.sql("select 'hello world';").show()
+   ```
 
 To use **Hybrid Execution**, sign up at <https://console.glaredb.com> and
 use the connection string for your deployment. For example:
@@ -195,6 +195,43 @@ Done with this data source? Remove it with the following command:
 DROP DATABASE my_pg;
 ```
 
+## Supported data sources
+
+| Source                 | Read | Write[^1] | Table Function | External Table | External Database | Supported Object Stores[^2] |
+| ---------------------- | :--: | :-------: | :------------: | :------------: | ----------------- | --------------------------- |
+| **Databases**          |  --  |           |       --       |       --       | --                |                             |
+| MySQL                  |  ✅  |   ✅✅    |       ✅       |       ✅       | ✅                | ➖                          |
+| PostgreSQL             |  ✅  |   ✅✅    |       ✅       |       ✅       | ✅                | ➖                          |
+| MariaDB _(via mysql)_  |  ✅  |   ✅✅    |       ✅       |       ✅       | ✅                | ➖                          |
+| Microsoft SQL Server   |  ✅  |   🚧🚧    |       ✅       |       ✅       | ✅                | ➖                          |
+| MongoDB                |  ✅  |   🚧🚧    |       ✅       |       ✅       | ✅                | ➖                          |
+| Snowflake              |  ✅  |   🚧🚧    |       ✅       |       ✅       | ✅                | ➖                          |
+| BigQuery               |  ✅  |   🚧🚧    |       ✅       |       ✅       | ✅                | ➖                          |
+| Cassandra/ScyllaDB     |  ✅  |   🚧🚧    |       ✅       |       ✅       | ✅                | ➖                          |
+| ClickHouse             |  ✅  |   🚧🚧    |       ✅       |       ✅       | ✅                | ➖                          |
+| DuckDB                 |  🚧  |   🚧🚧    |       🚧       |       🚧       | 🚧                | ➖                          |
+| Oracle                 |  🚧  |   🚧🚧    |       🚧       |       🚧       | 🚧                | ➖                          |
+| SQLite                 |  🚧  |   🚧🚧    |       🚧       |       🚧       | 🚧                | ➖                          |
+| ADBC                   |  🚧  |   🚧🚧    |       🚧       |       🚧       | 🚧                | ➖                          |
+| ODBC                   |  🚧  |   🚧🚧    |       🚧       |       🚧       | 🚧                | ➖                          |
+| **File Formats**       |  --  |    --     |       --       |       --       | --                |                             |
+| Apache Arrow           |  ✅  |   ✅✅    |       ✅       |       ✅       | ➖                | ✅✅✅✅✅                  |
+| Delta                  |  ✅  |   ✅✅    |       ✅       |       ✅       | ➖                | ✅✅✅✅✅                  |
+| CSV                    |  ✅  |   ✅🚧    |       ✅       |       ✅       | ➖                | ✅✅✅✅✅                  |
+| Newline Delimited JSON |  ✅  |   ✅🚧    |       ✅       |       ✅       | ➖                | ✅✅✅✅✅                  |
+| Apache Parquet         |  ✅  |   ✅🚧    |       ✅       |       ✅       | ➖                | ✅✅✅✅✅                  |
+| BSON                   |  ✅  |   ✅🚧    |       ✅       |       ✅       | ➖                | ✅✅✅✅✅                  |
+| Iceberg                |  ✅  |    🚧     |       ✅       |       ✅       | ➖                | ✅✅✅✅✅                  |
+| Lance                  |  ✅  |    🚧     |       ✅       |       ✅       | ➖                | ✅✅✅✅✅                  |
+| Microsoft Excel        |  ✅  |    🚧     |       ✅       |       🚧       | ➖                | ✅🚧🚧🚧🚧                  |
+| JSON                   |  🚧  |    🚧     |       🚧       |       🚧       | ➖                | 🚧🚧🚧🚧🚧                  |
+| Apache Avro            |  🚧  |    🚧     |       🚧       |       🚧       | ➖                | 🚧🚧🚧🚧🚧                  |
+| Apache ORC             |  🚧  |    🚧     |       🚧       |       🚧       | ➖                | 🚧🚧🚧🚧🚧                  |
+
+✅ = Supported
+➖ = Not Applicable
+🚧 = Not Yet Supported
+
 ## Building from source
 
 Building GlareDB requires Rust/Cargo to be installed. Check out [rustup](https://rustup.rs/) for
@@ -234,3 +271,6 @@ GlareDB is proudly powered by [Apache Datafusion](https://arrow.apache.org/dataf
 [Pandas]: https://github.com/pandas-dev/pandas
 [Polars]: https://github.com/pola-rs/polars
 [supported data sources]: https://docs.glaredb.com/docs/data-sources/supported/
+
+[^1]: Supported write modes are `COPY TO` and `INSERT INTO`.
+[^2]: Supported object stores are: Local File, HTTP (GET), Amazon S3, Google Cloud Storage, Azure Blob Storage.