fix clippy

Author: goldmedal

datafusion/core/src/execution/context/mod.rs

@@ -2893,21 +2893,21 @@ mod tests {
         for function in all_default_functions() {
             let udf = new_state.register_udf(function).unwrap();
             if let Some(udf) = udf {
-                assert!(false, "Function {} already registered", udf.name());
+                unreachable!("Function {} already registered", udf.name());
             }
         }
 
         for function in all_default_array_functions() {
             let udf = new_state.register_udf(function).unwrap();
             if let Some(udf) = udf {
-                assert!(false, "Function {} already registered", udf.name());
+                unreachable!("Function {} already registered", udf.name());
             }
         }
 
         for function in all_default_aggregate_functions() {
             let udaf = new_state.register_udaf(function).unwrap();
             if let Some(udaf) = udaf {
-                assert!(false, "Function {} already registered", udaf.name());
+                unreachable!("Function {} already registered", udaf.name());
             }
         }
 

datafusion/optimizer/src/push_down_limit.rs

@@ -65,7 +65,6 @@ impl OptimizerRule for PushDownLimit {
         };
 
         let Limit { skip, fetch, input } = limit;
-        let input = input;
 
         // Merge the Parent Limit and the Child Limit.
         if let LogicalPlan::Limit(child) = input.as_ref() {