kou commented on issue #46485:
URL: https://github.com/apache/arrow/issues/46485#issuecomment-2907722275
Can we use `Fn` or something instead?
(`*data.statistics` doesn't work when `data.statistics.get() == nullptr`.)
```diff
diff --git a/cpp/src/arrow/array/data.cc b/cpp/src/arrow/array/data.cc
index 2e55668fb9..6da4bb5317 100644
--- a/cpp/src/arrow/array/data.cc
+++ b/cpp/src/arrow/array/data.cc
@@ -165,7 +165,11 @@ Result<std::shared_ptr<ArrayData>> CopyToImpl(const
ArrayData& data,
ARROW_ASSIGN_OR_RAISE(output->dictionary, CopyToImpl(*data.dictionary,
to, copy_fn));
}
- output->statistics = data.statistics;
+ if (std::is_same_v<Fn, decltype(MemoryManager::CopyBuffer)>) {
+ output->statistics = data.statistics;
+ } else {
+ output->statistics =
std::make_shared<ArrayStatistics>(*data.statistics);
+ }
return output;
}
```
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