Alexey Kudinkin created HUDI-3882:
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Summary: Make sure Hudi Spark relations implementations provide
similar file-scanning metrics
Key: HUDI-3882
URL: https://issues.apache.org/jira/browse/HUDI-3882
Project: Apache Hudi
Issue Type: Improvement
Reporter: Alexey Kudinkin
Assignee: Alexey Kudinkin
Fix For: 0.12.0
After rebasing Hudi's COW table onto `BaseFileOnlyRelation` from
`HadoopFsRelation`, we lost very helpful file-scanning metrics like # of files
scanned, total size of files scanned, etc.
After some investigation, i've found out that this occurred b/c now instead of
relying on `FileScan` node in Spark plans like we're before, it now uses
`DataScan` node that doesn't provide such metrics.
This unwanted transition occurred b/c Spark internally predicates on
`HadoopFsRelation` to decide whether it's a `FileScan` or `DataScan`, and since
we stopped using `HadoopFsRelation` Hudi relations now fall into the latter
bucket
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