linhongliu-db opened a new pull request, #53146:
URL: https://github.com/apache/spark/pull/53146
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### What changes were proposed in this pull request?
This PR adds the complete serialization/deserialization infrastructure for
parsing metric view YAML definitions:
- Add Jackson YAML dependencies to pom.xml
- Implement canonical model for metric views:
- Column, Expression (Dimension/Measure), MetricView, Source
- YAMLVersion validation and exception types
- Implement version-specific serde (v0.1):
- YAML deserializer/serializer
- Base classes for extensibility
- Add JSON utilities for metadata serialization
### Why are the changes needed?
[SPIP: Metrics & semantic modeling in
Spark](https://docs.google.com/document/d/1xVTLijvDTJ90lZ_ujwzf9HvBJgWg0mY6cYM44Fcghl0/edit?tab=t.0#heading=h.4iogryr5qznc)
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
```
build/sbt "catalyst/testOnly
org.apache.spark.sql.metricview.serde.MetricViewFactorySuite"
```
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <[email protected]>
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