Sean Owen created SPARK-25369:
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Summary: Replace Java shim functional interfaces like
java.api.Function with Java 8 equivalents
Key: SPARK-25369
URL: https://issues.apache.org/jira/browse/SPARK-25369
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.4.0
Reporter: Sean Owen
In Spark 3, we should remove interfaces like
org.apache.spark.api.java.function.Function and replace with java.util.function
equivalents, for better compatibility with Java 8. This would let callers pass,
in more cases, an existing functional object in Java rather than wrap in a
lambda.
It's possible to have the functional interfaces in Spark just extend Java 8
functional interfaces to interoperate better with existing code, but might be
as well to remove them in Spark 3 to clean up.
A partial list of transitions from Spark to Java interfaces:
* Function -> Function
* Function0 -> Supplier
* Function2 -> BiFunction
* VoidFunction -> Consumer
* FlatMapFunction etc -> extends Function<T,Iterable<R>> etc
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