pitrou commented on a change in pull request #6744:
URL: https://github.com/apache/arrow/pull/6744#discussion_r413800208
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File path: cpp/src/parquet/file_reader.cc
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@@ -212,6 +237,21 @@ class SerializedFile : public ParquetFileReader::Contents {
file_metadata_ = std::move(metadata);
}
+ void PreBuffer(const std::vector<int>& row_groups,
+ const std::vector<int>& column_indices,
+ const ::arrow::io::CacheOptions& options) {
+ cached_source_ =
+ std::make_shared<arrow::io::internal::ReadRangeCache>(source_,
options);
Review comment:
> Correct me if I'm wrong, though, but even that doesn't help much
without more refactoring, since reading is organized along columns.
That was my original point, which you said was irrelevant...
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