[CORE] Unify utility class names with suffix Util
#7020
Closed
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Some utility classes use
Utils
as suffix of the names while some useUtil
, to align with vanilla Spark.The patch does some code cleanup to use
Util
uniformly. The changes don't cover all the classes for some reason but the major of them.Note C++ code will still use
Utils
. The PR only involves Java/Scala code.