Adding backtrace documentation (#7628)

Author: comphead

docs/source/user-guide/example-usage.md

@@ -25,10 +25,11 @@ Even [`more code examples`](../../../datafusion-examples) attached to the projec
 
 ## Update `Cargo.toml`
 
-Add the following to your `Cargo.toml` file:
+Find latest available Datafusion version on [DataFusion's
+crates.io] page. Add the dependency to your `Cargo.toml` file:
 
 ```toml
-datafusion = "26"
+datafusion = "31"
 tokio = "1.0"
 ```
 
@@ -232,3 +233,37 @@ with `native` or at least `avx2`.
 ```shell
 RUSTFLAGS='-C target-cpu=native' cargo +nightly run --release
 ```
+
+## Enable backtraces
+
+By default Datafusion returns errors as a plain message. There is option to enable more verbose details about the error,
+like error backtrace. To enable a backtrace you need to add Datafusion `backtrace` feature to your `Cargo.toml` file:
+
+```toml
+datafusion = { version = "31.0.0", features = ["backtrace"]}
+```
+
+Set environment [`variables`] https://doc.rust-lang.org/std/backtrace/index.html#environment-variables
+
+```bash
+RUST_BACKTRACE=1 ./target/debug/datafusion-cli
+DataFusion CLI v31.0.0
+❯ select row_numer() over (partition by a order by a) from (select 1 a);
+Error during planning: Invalid function 'row_numer'.
+Did you mean 'ROW_NUMBER'?
+
+backtrace:    0: std::backtrace_rs::backtrace::libunwind::trace
+             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
+   1: std::backtrace_rs::backtrace::trace_unsynchronized
+             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
+   2: std::backtrace::Backtrace::create
+             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/backtrace.rs:332:13
+   3: std::backtrace::Backtrace::capture
+             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/backtrace.rs:298:9
+   4: datafusion_common::error::DataFusionError::get_back_trace
+             at /arrow-datafusion/datafusion/common/src/error.rs:436:30
+   5: datafusion_sql::expr::function::<impl datafusion_sql::planner::SqlToRel<S>>::sql_function_to_expr
+   ............
+```
+
+Note: The backtrace wrapped into systems calls, so some steps on top of the backtrace can be ignored