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SparkSQL Custom UDF needs schemas to operate
I have created a custom UDF which counts the occurrences of items in a row of a dataframe. (It can handle NULLs)
import org.apache.spark.sql.catalyst.expressions.GenericRowWithSchema
import org.apache.spark.sql.catalyst.expressions.udf.{AggregateUDF, UserDefinedAggregateFunction}
object OccurrencesUDF {
def apply(
row: org.apache.spark.sql.catalyst.expressions.Row): org.apache.spark.sql.types.IntegerType = {
val parsedRow = row.toSeq.head
if(parsedRow.isEmpty)
0
else
1
}
}
class OccurrencesUDF extends UserDefinedAggregateFunction("occurrencesUDF",