harshmotw-db opened a new pull request, #48172:
URL: https://github.com/apache/spark/pull/48172
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### What changes were proposed in this pull request?
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This pull request adds the following metrics to JSON file scan nodes to
collect metrics related to variants being constructed as part of the scan:
```
variant top-level - total count
variant top-level - total byte size
variant top-level - total number of paths
variant top-level - total number of scalar values
variant top-level - max depth
variant nested - total count
variant nested - total byte size
variant nested - total number of paths
variant nested - total number of scalar values
variant nested - max depth
```
Top level and nested variant metrics are separated as they can have
different usage patterns. `singleVariantColumn` scans and columns in
user-provided schema scans where the column type is a top level variant (not
variant nested in a struct/array/map) are considered to be top level variants
while variants nested in other data types are considered to be nested variants.
### Why are the changes needed?
This change allows users to collect metrics on variant usage to better
monitor their data/workloads.
### Does this PR introduce _any_ user-facing change?
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Users will now be able to see variant metrics in JSON scan nodes which were
not available earlier.
### How was this patch tested?
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Comprehensive unit tests in VariantEndToEndSuite.scala
### Was this patch authored or co-authored using generative AI tooling?
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Yes, got some help related to scala syntax.
Generated by: ChatGPT 4o, GitHub CoPilot.
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