Adding a note about collisions for sanitize_dataframe_columns_names.

Author: JPFrancoia

awswrangler/catalog.py

@@ -679,6 +679,9 @@ def sanitize_dataframe_columns_names(df: pd.DataFrame) -> pd.DataFrame:
     - Remove non alphanumeric characters
     - Convert CamelCase to snake_case
 
+    Note: after transformation, some column names might not be unique anymore.
+        Example: the columns ["A", "a"] will be sanitized to ["a", "a"]
+
     Parameters
     ----------
     df : pandas.DataFrame