Update union implementation for Spark 2/3 cross-compatibility
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…Context API change
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Spark 3 removed the signatures of
JavaSparkContext#unionthat sparkplug was using, leaving only the varargs signatures: https://issues.apache.org/jira/browse/SPARK-25737This modifies the implementation of
sparkplug.core/unionto use the varargs signature so that it works with both Spark 2 and Spark 3.