pitrou commented on a change in pull request #6744:
URL: https://github.com/apache/arrow/pull/6744#discussion_r413800001
##########
File path: cpp/src/parquet/file_reader.cc
##########
@@ -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:
I'm afraid I don't understand you. How do you "read one row group at a
time" if the cache is shared at the FileReader level? Do you mean creating a
new Parquet file reader for each row group?
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