Get table function in ascii lowercase

Author: osipovartem

datafusion/core/src/execution/session_state.rs

@@ -1669,10 +1669,11 @@ impl ContextProvider for SessionContextProvider<'_> {
         name: &str,
         args: Vec<(Expr, Option<String>)>,
     ) -> datafusion_common::Result<Arc<dyn TableSource>> {
+        let name = name.to_ascii_lowercase();
         let tbl_func = self
             .state
             .table_functions
-            .get(name)
+            .get(&name)
             .cloned()
             .ok_or_else(|| plan_datafusion_err!("table function '{name}' not found"))?;
         let provider = tbl_func.create_table_provider(&args)?;

datafusion/sql/src/relation/mod.rs

@@ -434,12 +434,11 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
                         _ => plan_err!("Unsupported function argument: {arg:?}"),
                     })
                     .collect::<Result<Vec<(Expr, Option<String>)>>>()?;
-                let tbl_func_name = tbl_func_ref.table().to_ascii_lowercase();
                 let provider = self
                     .context_provider
-                    .get_table_function_source(&tbl_func_name, func_args)?;
+                    .get_table_function_source(tbl_func_ref.table(), func_args)?;
                 let plan =
-                    LogicalPlanBuilder::scan(tbl_func_name, provider, None)?.build()?;
+                    LogicalPlanBuilder::scan(tbl_func_ref.table(), provider, None)?.build()?;
                 (plan, alias)
             }
             // @todo: Support TableFactory::TableFunction