mapleFU commented on issue #38877:
URL: https://github.com/apache/arrow/issues/38877#issuecomment-1825881619
```diff
EncodedStatistics GetChunkStatistics() override {
EncodedStatistics result;
if (chunk_statistics_) result = chunk_statistics_->Encode();
+ if (current_dict_encoder_ != nullptr && !fallback_) {
+
chunk_statistics_->SetDistinctCount(current_dict_encoder_->num_entries());
+ }
return result;
}
```
A likely implementation might be the code above ( `SetDistinctCount` doesn't
exists in current code )
Also maybe we can find whether `parquet-mr` and `arrow-rs/parquet` writing
the `distinct_count` and follow the style of them
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