registerJavaUDAF (UDFRegistration)

Registers a Java user-defined aggregate function as a SQL function.

Syntax

registerJavaUDAF(name, javaClassName)

Parameters

Parameter	Type	Description
name	str	Name of the user-defined aggregate function.
javaClassName	str	Fully qualified name of the Java class.

Returns

None

Examples

Python

spark.udf.registerJavaUDAF("javaUDAF", "test.org.apache.spark.sql.MyDoubleAvg")
df = spark.createDataFrame([(1, "a"), (2, "b"), (3, "a")], ["id", "name"])
df.createOrReplaceTempView("df")
q = "SELECT name, javaUDAF(id) as avg from df group by name order by name desc"
spark.sql(q).collect()
# [Row(name='b', avg=102.0), Row(name='a', avg=102.0)]