Update cpp/src/arrow/compute/row/grouper.cc

apache · Nov 1, 2024 · bf2aff0 · bf2aff0
1 parent 3f4d627
commit bf2aff0
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/cpp/src/arrow/compute/row/grouper.cc b/cpp/src/arrow/compute/row/grouper.cc
@@ -777,8 +777,8 @@ struct GrouperFastImpl : public Grouper {
       } else {
         ARROW_ASSIGN_OR_RAISE(fixedlen_bufs[i],
                               AllocatePaddedBuffer((num_groups + 1) * sizeof(uint32_t)));
-        // init offset[0] as 0, avoid when num_groups == 0 
-        // fixedlen_bufs won't be initialized
+        // Set offset[0] to 0 so the later allocation of varlen_bufs doesn't see an
+        // uninitialized value when num_groups == 0.
         reinterpret_cast<uint32_t*>(fixedlen_bufs[i]->mutable_data())[0] = 0;
       }
       cols_[i] =