[FLINK-15600] Further relax the UDF constraints for Java classes

• Type: Bug
• Status: In Progress
• Priority: Not a Priority
• Resolution: Unresolved
• Component/s: Table SQL / API
• Labels: auto-deprioritized-major auto-deprioritized-minor auto-unassigned
• Assignee: Unassigned
• Reporter: Timo Walther
• Created: 15/Jan/20 10:33
• Updated: 18/Dec/21 10:39

Description

FLINK-12283 already relaxed the UDF constraints for classes which is a big usability improvement for Scala users. However, Java users are still facing issues when using anonymous inner classes.

We should allow the following:

tEnv.registerFunction("testi", new ScalarFunction() {
	public String eval(Integer i) {
		return String.valueOf(i);
	}
});