pitrou commented on a change in pull request #6744:
URL: https://github.com/apache/arrow/pull/6744#discussion_r413783259
##########
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 don't want anything specifically, but I wonder what users of the API
may want. If you're reading a 10GB file, in a streaming fashion, from S3, you
probably don't want to keep the 10GB in memory, right?
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
