c21 opened a new pull request, #36311:
URL: https://github.com/apache/spark/pull/36311
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### What changes were proposed in this pull request?
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This is a followup per comment in
https://issues.apache.org/jira/browse/SPARK-34960, to improve the documentation
for data source v2 aggregate push down of Parquet and ORC.
* Unify SQL config docs between Parquet and ORC, and add the note that if
statistics is missing from any file footer, exception would be thrown.
* Also adding the same note for exception in Parquet and ORC methods to
aggregate from statistics.
Though in future Spark release, we may improve the behavior to fallback to
aggregate from real data of file, in case any statistics are missing. We'd
better to make a clear documentation for current behavior now.
### Why are the changes needed?
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Give users & developers a better idea of when aggregate push down would
throw exception.
Have a better documentation for current behavior.
### Does this PR introduce _any_ user-facing change?
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Yes, the documentation change in SQL configs.
### How was this patch tested?
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Existing tests as this is just documentation change.
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