[Data] Add polars usage instruction to docs

doc/source/data/transforming-data.rst

@@ -212,7 +212,7 @@ In this case, your function would look like:
         # yield the same batch multiple times
         for _ in range(10):
             yield batch
-            
+
 Choosing the right batch format
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
@@ -249,6 +249,22 @@ program might run into out-of-memory (OOM) errors.
 
 If you encounter an OOM errors, try decreasing your ``batch_size``.
 
+Enabling ``Polars`` operations
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+You can enable ``Polars`` globally to optimize certain Ray Data operations. Ray Data uses ``Polars`` internally for better performance when processing data.
+
+To enable ``Polars`` operations, configure the :class:`~ray.data.DataContext`:
+
+.. testcode::
+
+    import ray
+
+    ctx = ray.data.DataContext.get_current()
+    ctx.use_polars_sort = True
+
+When you enable this flag, Ray Data automatically uses ``Polars`` for tabular dataset sorting operations, which can significantly improve performance for certain workloads. This doesn't affect your UDF code, you can still use any batch format in :meth:`~ray.data.Dataset.map_batches`.
+
 
 .. _stateful_transforms:
 
@@ -365,7 +381,7 @@ You can read more about resources in Ray here: :ref:`resource-requirements`.
     :hide:
 
     import ray
-    
+
     ds = ray.data.range(1)
 
 .. testcode::