Github user tonycox commented on the issue:
https://github.com/apache/flink/pull/2686
@wuchong, second option supports only in SQL. in table api we still cast
manually.
in first option where should I create power(double, BigDecimal) function,
which package or util class?
@fhueske, explicit cast of bigDecimal should be everywhere, and we don't
need `PowerCallGen` anymore ?
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