felipecrv commented on code in PR #36740:
URL: https://github.com/apache/arrow/pull/36740#discussion_r1267090415
##########
cpp/src/arrow/compute/kernels/vector_run_end_encode.cc:
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@@ -254,7 +254,7 @@ struct RunEndEncodeExec {
return RunEndEncodeNullArray(TypeTraits<RunEndType>::type_singleton(),
ctx,
input_array, result);
} else {
- const bool has_validity_buffer = input_array.MayHaveNulls();
+ const bool has_validity_buffer = input_array.GetNullCount() > 0;
Review Comment:
Yes. The kernel will try to write to the validity buffer but it wasn't
present after the pre-allocation.
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