Operator names setted in table-api are used by visualization and logging, it is import to make these names simple and readable. Currently, UserDefinedFunction’s name contains class CanonicalName and md5 value making the name too long and unfriendly to users.
As shown in the following example,
select: (a, b, c, org$apache$flink$table$expressions$utils$RichFunc1$281f7e61ec5d8da894f5783e2e17a4f5(a) AS _c3, org$apache$flink$table$expressions$utils$RichFunc2$fb99077e565685ebc5f48b27edc14d98(c) AS _c4)
Provide getName method for UserDefinedFunction. The method will return class name by default. Users can also override the method to return whatever he wants.
What do you think [~fhueske] ?
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