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[SPARK-3855][SQL] Preserve the result attribute of python UDFs though transformations #2717

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[SPARK-3855][SQL] Preserve the result attribute of python UDFs though transformations #2717

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9533286
Correctly preserve the result attribute of python UDFs though transfo…
marmbrus Oct 8, 2014
6343bcb
add test
marmbrus Oct 9, 2014
da14879
Fix test
marmbrus Oct 10, 2014
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6 changes: 6 additions & 0 deletions python/pyspark/tests.py
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Original file line number Diff line number Diff line change
Expand Up @@ -679,6 +679,12 @@ def test_udf(self):
[row] = self.sqlCtx.sql("SELECT twoArgs('test', 1)").collect()
self.assertEqual(row[0], 5)

def test_udf2(self):
self.sqlCtx.registerFunction("strlen", lambda string: len(string))
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data type should be IntegerType

self.sqlCtx.inferSchema(self.sc.parallelize([Row(a="test")])).registerTempTable("test")
[res] = self.sqlCtx.sql("SELECT strlen(a) FROM test WHERE strlen(a) > 1").collect()
self.assertEqual(u"4", res[0])

def test_broadcast_in_udf(self):
bar = {"a": "aa", "b": "bb", "c": "abc"}
foo = self.sc.broadcast(bar)
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2 changes: 1 addition & 1 deletion sql/core/src/main/scala/org/apache/spark/sql/execution/SparkStrategies.scala
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Expand Up @@ -291,7 +291,7 @@ private[sql] abstract class SparkStrategies extends QueryPlanner[SparkPlan] {
execution.PhysicalRDD(Nil, singleRowRdd) :: Nil
case logical.Repartition(expressions, child) =>
execution.Exchange(HashPartitioning(expressions, numPartitions), planLater(child)) :: Nil
case e @ EvaluatePython(udf, child) =>
case e @ EvaluatePython(udf, child, _) =>
BatchPythonEvaluation(udf, e.output, planLater(child)) :: Nil
case LogicalRDD(output, rdd) => PhysicalRDD(output, rdd) :: Nil
case _ => Nil
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12 changes: 10 additions & 2 deletions sql/core/src/main/scala/org/apache/spark/sql/execution/pythonUdfs.scala
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Expand Up @@ -105,13 +105,21 @@ private[spark] object ExtractPythonUdfs extends Rule[LogicalPlan] {
}
}

object EvaluatePython {
def apply(udf: PythonUDF, child: LogicalPlan) =
new EvaluatePython(udf, child, AttributeReference("pythonUDF", udf.dataType)())
}

/**
* :: DeveloperApi ::
* Evaluates a [[PythonUDF]], appending the result to the end of the input tuple.
*/
@DeveloperApi
case class EvaluatePython(udf: PythonUDF, child: LogicalPlan) extends logical.UnaryNode {
val resultAttribute = AttributeReference("pythonUDF", udf.dataType, nullable=true)()
case class EvaluatePython(
udf: PythonUDF,
child: LogicalPlan,
resultAttribute: AttributeReference)
extends logical.UnaryNode {

def output = child.output :+ resultAttribute
}
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