[PR] test: add sql-file test confirming fallback on parquet variant reads [datafusion-comet]

["andygrove (via GitHub)" <gi...@apache.org>]

andygrove opened a new pull request, #4021:
URL: https://github.com/apache/datafusion-comet/pull/4021

   ## Which issue does this PR close?
   
   Closes #.
   
   ## Rationale for this change
   
   Comet does not support Spark 4.0's `VARIANT` data type, so scans exposing a VariantType column must fall back to Spark. There is no regression test pinning this behavior today. If a future change silently lets a VariantType column through the scan, we would only notice through runtime errors or wrong results. A targeted sql-file test locks in the fallback contract.
   
   ## What changes are included in this PR?
   
   - New file `spark/src/test/resources/sql-tests/expressions/misc/variant.sql`
   - Gated with `-- MinSparkVersion: 4.0` so it is skipped on Spark 3.4 / 3.5 via `CometSqlFileTestSuite`
   - Creates parquet-backed tables with a `VARIANT` column (directly and nested inside `STRUCT<v: VARIANT>`), populated via `parse_json`
   - Uses `query expect_fallback(Unsupported v of type VariantType)` on five queries covering projection, `variant_get` extraction, `variant_get` in a predicate, a `COUNT(*)` with a not-null filter, and a struct-containing-variant projection
   
   ## How are these changes tested?
   
   Ran the new test under the Spark 4.0 profile:
   
   ```
   ./mvnw test -Pspark-4.0 -Dsuites="org.apache.comet.CometSqlFileTestSuite variant" -Dtest=none
   ```
   
   All five queries in the file fall back with the expected reason and the suite reports `Tests: succeeded 1, failed 0`.


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Re: [PR] test: add sql-file test confirming fallback on parquet variant reads [datafusion-comet]

["andygrove (via GitHub)" <gi...@apache.org>]

andygrove merged PR #4021:
URL: https://github.com/apache/datafusion-comet/pull/4021


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