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[SPARK-12445][SQL] Fix NullPointerException when passing null as array #10401

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viirya wants to merge 2 commits into from
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[SPARK-12445][SQL] Fix NullPointerException when passing null as array #10401

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086bf00
Fix null exception when passing null as array.
viirya Dec 20, 2015
296196e
Move test case.
viirya Dec 22, 2015
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11 changes: 7 additions & 4 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -407,10 +407,13 @@ object ScalaReflection extends ScalaReflection {
val externalDataType = dataTypeFor(elementType)
val Schema(catalystType, nullable) = silentSchemaFor(elementType)
if (isNativeType(catalystType)) {
NewInstance(
classOf[GenericArrayData],
input :: Nil,
dataType = ArrayType(catalystType, nullable))
expressions.If(
IsNull(input),
expressions.Literal.create(null, ArrayType(catalystType, nullable)),
NewInstance(
classOf[GenericArrayData],
input :: Nil,
dataType = ArrayType(catalystType, nullable)))
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@cloud-fan cloud-fan Dec 28, 2015

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A simple idea is to set propafateNull = true for NewInstance, and it's also fixed in #10443 which makes false as default value for propagateNull.

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@viirya viirya Dec 28, 2015

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ok. I think this can be closed.

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@viirya viirya Dec 28, 2015

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Will #10443 be merged soon? I think I have another pr depending this fixing.

} else {
val clsName = getClassNameFromType(elementType)
val newPath = s"""- array element class: "$clsName"""" +: walkedTypePath
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19 changes: 19 additions & 0 deletions ...talyst/src/test/scala/org/apache/spark/sql/catalyst/encoders/ExpressionEncoderSuite.scala
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Expand Up @@ -27,6 +27,7 @@ import com.google.common.collect.MapMaker

import org.apache.spark.SparkFunSuite
import org.apache.spark.sql.Encoders
import org.apache.spark.sql.catalyst.ScalaReflection
import org.apache.spark.sql.catalyst.expressions.AttributeReference
import org.apache.spark.sql.catalyst.util.ArrayData
import org.apache.spark.sql.catalyst.{OptionalData, PrimitiveData}
Expand Down Expand Up @@ -239,6 +240,24 @@ class ExpressionEncoderSuite extends SparkFunSuite {
ExpressionEncoder.tuple(intEnc, ExpressionEncoder.tuple(intEnc, longEnc))
}

test("null as array") {
val data = Seq(
(Array[Int](2, 1, 3), Array("b", "c", "a")),
(Array[Int](), Array[String]()),
(null, null)
)

val schema = ScalaReflection.schemaFor[Tuple2[Array[Int], Array[String]]]
.dataType.asInstanceOf[StructType]
val attributeSeq = schema.toAttributes
val arrayDataEncoder = encoderFor[Tuple2[Array[Int], Array[String]]]
val boundEncoder = arrayDataEncoder.resolve(attributeSeq, outers).bind(attributeSeq)
data.foreach { x =>
val convertedBack = boundEncoder.fromRow(boundEncoder.toRow(x))
assert(convertedBack._1 === x._1 && convertedBack._2 === x._2)
}
}

test("nullable of encoder schema") {
def checkNullable[T: ExpressionEncoder](nullable: Boolean*): Unit = {
assert(implicitly[ExpressionEncoder[T]].schema.map(_.nullable) === nullable.toSeq)
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