add better error

Author: OussamaSaoudi

kernel/src/scan/log_replay.rs

@@ -488,8 +488,13 @@ impl ParallelizableLogReplayProcessor for ScanLogReplayProcessor {
     fn process_actions_batch(&self, actions_batch: ActionsBatch) -> DeltaResult<Self::Output> {
         let ActionsBatch {
             actions,
-            is_log_batch: _,
+            is_log_batch,
         } = actions_batch;
+        require!(
+            !is_log_batch,
+            Error::generic("Parallel checkpoint processor may only be applied to checkpoint files")
+        );
+
         // Build an initial selection vector for the batch which has had the data skipping filter
         // applied. The selection vector is further updated by the deduplication visitor to remove
         // rows that are not valid adds.