Hi All,
        I found flink is lack of some basic functions , for example string 
split, regular express support, json parse and extract support, these function 
are used frequently in development , but they are not supported, use has to 
write UDF to support this.
        And some of the provided functions are lack of usability, for example 
log(2, 1.0) and exp(1.0)  with double params are not supported. I think they 
are not hard to implement and they are very basic functions.
        Will flink enhance the basic functions , maybe in later releases?

Best,
Henry

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