jp0317 commented on code in PR #39818:
URL: https://github.com/apache/arrow/pull/39818#discussion_r1468739708
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cpp/src/parquet/column_reader.cc:
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@@ -70,6 +70,8 @@ namespace {
// The minimum number of repetition/definition levels to decode at a time, for
// better vectorized performance when doing many smaller record reads
constexpr int64_t kMinLevelBatchSize = 1024;
+// The max buffer size of validility bitmap for skipping buffered levels.
+constexpr int64_t kMaxSkipLevelBufferSize = 128;
Review Comment:
tried 1024 byte size and got similar results. It basically correlates with
the number of levels being buffered. I tend to keep it small to avoid
occupying too much memory as it's per column buffer.
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