dkropachev opened a new pull request, #1385:
URL: https://github.com/apache/cassandra-spark-connector/pull/1385
## Summary
- Add `-Werror` to `scalacOptions` in `build.sbt` so the build fails on any
Scala compiler warning
- Fix all existing warnings across 58 files in `driver/`, `connector/`, and
`test-support/` modules
## Warning categories fixed
- **Implicit definitions without explicit types** — added return type
annotations (ColumnMapper, CanBuildFrom, package.scala, Batch,
RowWriterFactory, DseGraphUnionedRDD, SplitSizeEstimator, etc.)
- **Auto-application deprecation** — added explicit `()` to nullary method
calls (MultiplexingSchemaListener, CassandraScanBuilder, openSession,
createResultProjection, etc.)
- **Deprecated collection APIs** — `mapValues` → `.view.mapValues().toMap`,
`Stream` → `LazyList`, `toIterator` → `iterator`, `toStream` → `.to(LazyList)`,
`JavaConverters` → `jdk.CollectionConverters`
- **Implicit Array-to-IndexedSeq conversions** — added explicit
`.toIndexedSeq` calls
- **Array varargs defensive copy** — added `.toIndexedSeq` before `: _*`
splats
- **Unicode arrows** — replaced `→`/`⇒` with `->`/`=>`
- **Missing language imports** — added `implicitConversions`,
`existentials`, `reflectiveCalls` where needed
- **Non-exhaustive matches** — added missing cases
- **Deprecated Java/library APIs** — suppressed with
`@nowarn("cat=deprecation")` where no alternative exists (JaroWinkler,
getNodeFilter, Date methods)
- **Unchecked erasure patterns** — added `@unchecked` annotations
- **Deprecated symbol literals** — replaced `'name` with `Symbol("name")`
- **Deprecated `Class.newInstance()`** — replaced with
`getDeclaredConstructor().newInstance()`
## Test plan
- [x] `./sbt/sbt clean compile` succeeds with zero warnings
- [x] `./sbt/sbt clean test:compile` succeeds with zero warnings
- [x] `./sbt/sbt test` — all 320 unit tests pass
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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