Github user maropu commented on the issue:
https://github.com/apache/spark/pull/17264
I quickly did check performance changes;
```
public class TestGenericUDF extends GenericUDF {
@Override
public ObjectInspector initialize(ObjectInspector[] objectInspectors)
throws UDFArgumentException {
return PrimitiveObjectInspectorFactory.javaLongObjectInspector;
}
@Override
public Object evaluate(DeferredObject[] args) throws HiveException {
final long a1 =
PrimitiveObjectInspectorFactory.javaLongObjectInspector.get(args[0].get());
final long a2 =
PrimitiveObjectInspectorFactory.javaLongObjectInspector.get(args[1].get());
final long a3 =
PrimitiveObjectInspectorFactory.javaLongObjectInspector.get(args[2].get());
final long a4 =
PrimitiveObjectInspectorFactory.javaLongObjectInspector.get(args[3].get());
return a1 + a2 + a3 + a4;
}
}
```
```
$./bin/spark-shell --master local[1] --conf spark.sql.shuffle.partitions=1
-v
scala> sql("CREATE TEMPORARY FUNCTION testUdf AS
'hivemall.ftvec.TestGenericUDF'")
scala> :paste
def timer[R](block: => R): R = {
val t0 = System.nanoTime()
val result = block
val t1 = System.nanoTime()
println("Elapsed time: " + ((t1 - t0 + 0.0) / 1000000000.0)+ "s")
result
}
scala> spark.range(3000000).createOrReplaceTempView("t")
scala> timer { sql("SELECT testUdf(id, id, id, id) FROM
t").queryExecution.executedPlan.execute().foreach(x => {}) }
```
```
# performance w/ this patch
Elapsed time: 1.901269167s
# performance w/o this patch
Elapsed time: 0.492860666s
```
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