Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/2686
Hi @fhueske @tonycox , the PR is really good.
But I think the true reason of this issue is because the
`BuiltInMethods.POWER_DEC` is bound to a wrong method, which should be
`power(double, BigDecimal)`.
So what we need to do is just create a `power(double, BigDecimal)` instead
of `SqlFunctions.power(long, BigDecimal)`. And all the additional
`addSqlFunction` are not necessary.
In addition , this can fix `SQRT(double)` too, which is not executable now.
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