wgtmac commented on code in PR #36192:
URL: https://github.com/apache/arrow/pull/36192#discussion_r1236200894
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cpp/src/parquet/file_reader.cc:
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@@ -268,6 +272,7 @@ class SerializedRowGroup : public RowGroupReader::Contents {
std::unique_ptr<RowGroupMetaData> row_group_metadata_;
ReaderProperties properties_;
int row_group_ordinal_;
+ std::unordered_set<int>& prebuffered_column_chunks_;
Review Comment:
IMO, this would be better to use `const std::unordered_set<int>`, without
reference.
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cpp/src/parquet/file_reader.cc:
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@@ -178,13 +179,15 @@ class SerializedRowGroup : public
RowGroupReader::Contents {
std::shared_ptr<::arrow::io::internal::ReadRangeCache>
cached_source,
int64_t source_size, FileMetaData* file_metadata,
int row_group_number, const ReaderProperties& props,
+ std::unordered_set<int>& prebuffered_column_chunks,
Review Comment:
`const std::unordered_set<int>&` or `std::unordered_set<int>`
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