From 4ea8e5c44a39a069b7829fe575ac1b37e89d3ea3 Mon Sep 17 00:00:00 2001
From: Giulio Eulisse <10544+ktf@users.noreply.github.com>
Date: Tue, 5 May 2026 17:28:04 +0200
Subject: [PATCH] DPL: more debug messages for the reader

---
 Framework/Core/src/FragmentToBatch.cxx | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Framework/Core/src/FragmentToBatch.cxx b/Framework/Core/src/FragmentToBatch.cxx
index 1a6c3bca3cc60..ada31be814fc8 100644
--- a/Framework/Core/src/FragmentToBatch.cxx
+++ b/Framework/Core/src/FragmentToBatch.cxx
@@ -44,7 +44,14 @@ void FragmentToBatch::fill(std::shared_ptr<arrow::Schema> schema, std::shared_pt
   options->dataset_schema = schema;
   auto scanner = format->ScanBatchesAsync(options, mFragment);
   auto batch = (*scanner)();
-  mRecordBatch = *batch.result();
+  auto result = batch.result();
+  if (!result.ok()) {
+    throw std::runtime_error("FragmentToBatch::fill: scan failed: " + result.status().ToString());
+  }
+  mRecordBatch = *result;
+  if (!mRecordBatch) {
+    throw std::runtime_error("FragmentToBatch::fill: scan returned null RecordBatch");
+  }
   // Notice that up to here the buffer was not yet filled.
 }