[SPARK-27692][SQL] Constant fold deterministic Scala UDFs with foldable arguments#28008

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rednaxelafx:constfold-scala-udf

Commits on Mar 25, 2020

Conservatively constant fold Scala UDFs that meet all of the following criteria:
rednaxelafx
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Rebase to latest master and fix compilation error in test suite
rednaxelafx
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