AnuragRaut08 commented on code in PR #51093:
URL: https://github.com/apache/arrow/pull/51093#discussion_r3905873729
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cpp/src/arrow/array/array_nested.cc:
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@@ -896,13 +896,19 @@ Status MapArray::ValidateChildData(
if (pair_data->type->id() != Type::STRUCT) {
return Status::Invalid("Map array child array should have struct type");
}
- if (pair_data->MayHaveNulls()) {
+ // Use GetNullCount() rather than MayHaveNulls() so that an all-valid
+ // validity bitmap (null_count == kUnknownNullCount but every bit set)
+ // is not mistakenly treated as containing nulls. MayHaveNulls() returns
+ // true whenever a bitmap is present and null_count != 0, which includes
+ // kUnknownNullCount (-1); GetNullCount() actually counts the bits and
+ // caches the result. See GH-51029.
+ if (pair_data->GetNullCount() != 0) {
Review Comment:
Done, removed the lengthy comment.
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