Quanlong Huang created ORC-961:
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Summary: Expose metrics of the reader
Key: ORC-961
URL: https://issues.apache.org/jira/browse/ORC-961
Project: ORC
Issue Type: New Feature
Components: C++
Affects Versions: 1.7.0
Reporter: Quanlong Huang
It'd be useful for clients to collect metrics of the evaluation of the pushed
down predicates. Currently SargsApplier keeps track of the selected RowGroups
and evaluated RowGroups:
[https://github.com/apache/orc/blob/40ee321b209cad1de73fc97b653636aa0fff28f6/c++/src/sargs/SargsApplier.hh#L79-L81]
However, we are lack of an interface in RowReader to expose the metrics. Note
that sargsApplier is a private member inside RowReaderImpl. We need an
interface to expose it or only its stats.
It'd also be useful if we expose other metrics of a RowReader, e.g. acutal mem
usage, time elapsed in decoding/decompression, time elapsed in evaluating
SearchArguments.
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