docs: querying a table

Signed-off-by: Abdullahsab3 <[email protected]>

docs/usage/querying-delta-tables.md

@@ -115,4 +115,23 @@ Dask Name: read-parquet, 6 tasks
 0     5  2021    12   4
 0     6  2021    12  20
 1     7  2021    12  20
+```
+
+When working with the Rust API, Apache Datafusion can be used to query data from a delta table. 
+
+```rust
+let table = deltalake::open_table("../rust/tests/data/delta-0.8.0-partitioned").await?;
+let ctx = SessionContext::new();
+ctx.register_table("simple_table", Arc::new(table.clone()))?;
+let df = ctx.sql("SELECT value FROM simple_table WHERE year = 2021").await?;
+df.show().await?;
+```
+
+Apache Datafusion also supports a Dataframe interface than can be used instead of the SQL interface:
+```rust
+let table = deltalake::open_table("../rust/tests/data/delta-0.8.0-partitioned").await?;
+let ctx = SessionContext::new();
+let dataframe = ctx.read_table( Arc::new(table.clone()))?;
+let df = dataframe.filter(col("year").eq(lit(2021)))?.select(vec![col("value")])?;
+df.show().await?;
 ```