Yao-MR opened a new pull request, #12042:
URL: https://github.com/apache/gluten/pull/12042
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## What changes are proposed in this pull request?
When a table has many partitions, the metadata validation checks every root
path with `fileLimit` files each, resulting in excessive I/O cost.
This patch introduces a sampling mechanism that selects a percentage of root
paths for validation instead of checking all of them. The file limit is
distributed evenly across the sampled paths.
Key changes:
- Add config
`spark.gluten.sql.fallbackUnexpectedMetadataParquet.samplePercentage` with
default value 0.1 (10% sampling)
- Use evenly spaced interval sampling for good partition coverage
- Add unit tests for the sampling logic
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## How was this patch tested?
Existing tests in ParquetEncryptionDetectionSuite continue to pass without
modification.
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## Was this patch authored or co-authored using generative AI tooling?
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ISSUE: https://github.com/apache/gluten/issues/11782
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