felipecrv commented on code in PR #36740:
URL: https://github.com/apache/arrow/pull/36740#discussion_r1266871238
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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:
@mapleFU this is the fix to the issue. `MayHaveNulls` was returning `true`
here because the validity bitmap exists, but down the road, when the REE is
allocated, validity buffer was assumed to also exist in the allocated output.
When, in fact, it didn't actually exist because `null_count == 0` gets that
buffer cleared.
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