Aggregate Functions rewrite for new Aggregator API #480
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Is this PR related to a proposed Issue?
No
What changes were proposed in this PR?
User Defined Aggregate Functions API is depreciated in Spark 3.0.
(apache/spark#25024)
So I rewrite user defined aggregate functions.
How was this patch tested?
yes. add to test.
Did this PR include necessary documentation updates?
no(function is not changed)