Github user haohui commented on the issue:
https://github.com/apache/flink/pull/3426
Fix the unit tests.
There are two additional changes:
1. There are precision differences when converting `double` to
`BigDecimal`. Fix the unit tests.
2. When registering UDFs Flink needs to distinguish nullable and
non-nullable types. Patched `UserDefinedFunctionUtils`. We need a solution like
FLINK-5177 to handle these cases systematically.
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