Uroš Bojanić created SPARK-58947:
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             Summary: Add tests for SparkCollectionUtils
                 Key: SPARK-58947
                 URL: https://issues.apache.org/jira/browse/SPARK-58947
             Project: Spark
          Issue Type: Test
          Components: Spark Core
    Affects Versions: 4.3.0
            Reporter: Uroš Bojanić


SparkCollectionUtils (common/utils, org.apache.spark.util) has no test coverage 
despite being used in production (e.g. StructType field indexing via 
toMapWithIndex). This adds a unit test suite covering toMapWithIndex, 
isEmpty/isNotEmpty, and createArray, including its per-primitive-type dispatch 
and the reference-type and size-0 cases. Test-only; no behavior change.



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