justinli500 commented on code in PR #49855:
URL: https://github.com/apache/arrow/pull/49855#discussion_r3726349551
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cpp/src/parquet/arrow/reader_internal.h:
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@@ -133,5 +135,50 @@ Status
TransferColumnData(::parquet::internal::RecordReader* reader,
const ColumnDescriptor* descr, const ReaderContext*
ctx,
std::shared_ptr<::arrow::ChunkedArray>* out);
+// ----------------------------------------------------------------------
+// Pre-buffer eviction
+
+// GH-39808: as row groups finish decoding (possibly out of order under
+// readahead), advance a watermark over the leading run of completed ones and
+// evict cache entries ending before the lowest byte any remaining one needs.
+class ReadCacheEvictionState {
Review Comment:
Thanks, I went with this. Eviction now follows the queued output order, and
I also removed `ReadCacheEvictionState`.
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