Github user tonycox commented on the issue:
https://github.com/apache/flink/pull/2686
Hi @wuchong , native java implementation of "power" function suits to most
cases. So i deleted POWER_DEC from flink, because it has no proper types.
Actually we don't make user's life harder. Instead of this I think the best way
to solve this issue is to do what Fabian said https://goo.gl/hjtlOd, just cast
bigDecimal in table api manually. And tell in exception message that they
should cast. Tests of sqrt and power with all types are good
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