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[SPARK-20253][SQL] Remove unnecessary nullchecks of a return value from Spark runtime routines in generated Java code #17569

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Original file line number Diff line number Diff line change
Expand Up @@ -251,19 +251,22 @@ object ScalaReflection extends ScalaReflection {
getPath :: Nil)

case t if t <:< localTypeOf[java.lang.String] =>
Invoke(getPath, "toString", ObjectType(classOf[String]))
Invoke(getPath, "toString", ObjectType(classOf[String]), returnNullable = false)

case t if t <:< localTypeOf[java.math.BigDecimal] =>
Invoke(getPath, "toJavaBigDecimal", ObjectType(classOf[java.math.BigDecimal]))
Invoke(getPath, "toJavaBigDecimal", ObjectType(classOf[java.math.BigDecimal]),
returnNullable = false)

case t if t <:< localTypeOf[BigDecimal] =>
Invoke(getPath, "toBigDecimal", ObjectType(classOf[BigDecimal]))
Invoke(getPath, "toBigDecimal", ObjectType(classOf[BigDecimal]), returnNullable = false)

case t if t <:< localTypeOf[java.math.BigInteger] =>
Invoke(getPath, "toJavaBigInteger", ObjectType(classOf[java.math.BigInteger]))
Invoke(getPath, "toJavaBigInteger", ObjectType(classOf[java.math.BigInteger]),
returnNullable = false)

case t if t <:< localTypeOf[scala.math.BigInt] =>
Invoke(getPath, "toScalaBigInt", ObjectType(classOf[scala.math.BigInt]))
Invoke(getPath, "toScalaBigInt", ObjectType(classOf[scala.math.BigInt]),
returnNullable = false)

case t if t <:< localTypeOf[Array[_]] =>
val TypeRef(_, _, Seq(elementType)) = t
Expand All @@ -284,7 +287,7 @@ object ScalaReflection extends ScalaReflection {
val arrayCls = arrayClassFor(elementType)

if (elementNullable) {
Invoke(arrayData, "array", arrayCls)
Invoke(arrayData, "array", arrayCls, returnNullable = false)
} else {
val primitiveMethod = elementType match {
case t if t <:< definitions.IntTpe => "toIntArray"
Expand All @@ -297,7 +300,7 @@ object ScalaReflection extends ScalaReflection {
case other => throw new IllegalStateException("expect primitive array element type " +
"but got " + other)
}
Invoke(arrayData, primitiveMethod, arrayCls)
Invoke(arrayData, primitiveMethod, arrayCls, returnNullable = false)
}

case t if t <:< localTypeOf[Seq[_]] =>
Expand Down Expand Up @@ -330,19 +333,21 @@ object ScalaReflection extends ScalaReflection {
Invoke(
MapObjects(
p => deserializerFor(keyType, Some(p), walkedTypePath),
Invoke(getPath, "keyArray", ArrayType(schemaFor(keyType).dataType)),
Invoke(getPath, "keyArray", ArrayType(schemaFor(keyType).dataType),
returnNullable = false),
schemaFor(keyType).dataType),
"array",
ObjectType(classOf[Array[Any]]))
ObjectType(classOf[Array[Any]]), returnNullable = false)

val valueData =
Invoke(
MapObjects(
p => deserializerFor(valueType, Some(p), walkedTypePath),
Invoke(getPath, "valueArray", ArrayType(schemaFor(valueType).dataType)),
Invoke(getPath, "valueArray", ArrayType(schemaFor(valueType).dataType),
returnNullable = false),
schemaFor(valueType).dataType),
"array",
ObjectType(classOf[Array[Any]]))
ObjectType(classOf[Array[Any]]), returnNullable = false)

StaticInvoke(
ArrayBasedMapData.getClass,
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,7 @@ object RowEncoder {
udtClass,
Nil,
dataType = ObjectType(udtClass), false)
Invoke(obj, "serialize", udt, inputObject :: Nil)
Invoke(obj, "serialize", udt, inputObject :: Nil, returnNullable = false)

case TimestampType =>
StaticInvoke(
Expand Down Expand Up @@ -136,16 +136,18 @@ object RowEncoder {
case t @ MapType(kt, vt, valueNullable) =>
val keys =
Invoke(
Invoke(inputObject, "keysIterator", ObjectType(classOf[scala.collection.Iterator[_]])),
Invoke(inputObject, "keysIterator", ObjectType(classOf[scala.collection.Iterator[_]]),
returnNullable = false),
"toSeq",
ObjectType(classOf[scala.collection.Seq[_]]))
ObjectType(classOf[scala.collection.Seq[_]]), returnNullable = false)
val convertedKeys = serializerFor(keys, ArrayType(kt, false))

val values =
Invoke(
Invoke(inputObject, "valuesIterator", ObjectType(classOf[scala.collection.Iterator[_]])),
Invoke(inputObject, "valuesIterator", ObjectType(classOf[scala.collection.Iterator[_]]),
returnNullable = false),
"toSeq",
ObjectType(classOf[scala.collection.Seq[_]]))
ObjectType(classOf[scala.collection.Seq[_]]), returnNullable = false)
val convertedValues = serializerFor(values, ArrayType(vt, valueNullable))

NewInstance(
Expand Down Expand Up @@ -262,17 +264,18 @@ object RowEncoder {
input :: Nil)

case _: DecimalType =>
Invoke(input, "toJavaBigDecimal", ObjectType(classOf[java.math.BigDecimal]))
Invoke(input, "toJavaBigDecimal", ObjectType(classOf[java.math.BigDecimal]),
returnNullable = false)

case StringType =>
Invoke(input, "toString", ObjectType(classOf[String]))
Invoke(input, "toString", ObjectType(classOf[String]), returnNullable = false)
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@cloud-fan cloud-fan Apr 8, 2017

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can we check how many places we set returnNullable to true? If it's only a few, we can change the default value of returnNullable to false.

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@kiszk kiszk Apr 8, 2017

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Here is statistics for 59 call sites of Invoke().

18: dataType is primitive type
21: returnNullable is true (no specification at call site, as default)
19: returnNullable is false
1: set a variable to `returnNullable

What do you think?

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ok let's keep the default value unchanged


case ArrayType(et, nullable) =>
val arrayData =
Invoke(
MapObjects(deserializerFor(_), input, et),
"array",
ObjectType(classOf[Array[_]]))
ObjectType(classOf[Array[_]]), returnNullable = false)
StaticInvoke(
scala.collection.mutable.WrappedArray.getClass,
ObjectType(classOf[Seq[_]]),
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -225,25 +225,26 @@ case class Invoke(
getFuncResult(ev.value, s"${obj.value}.$functionName($argString)")
} else {
val funcResult = ctx.freshName("funcResult")
// If the function can return null, we do an extra check to make sure our null bit is still
// set correctly.
val postNullCheckAndAssign = if (!returnNullable) {
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how about just assignResult?

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+1

s"${ev.value} = (${ctx.boxedType(javaType)}) $funcResult;"
} else {
s"""
if ($funcResult != null) {
${ev.value} = (${ctx.boxedType(javaType)}) $funcResult;
} else {
${ev.isNull} = true;
}
"""
}
s"""
Object $funcResult = null;
${getFuncResult(funcResult, s"${obj.value}.$functionName($argString)")}
if ($funcResult == null) {
${ev.isNull} = true;
} else {
${ev.value} = (${ctx.boxedType(javaType)}) $funcResult;
}
$postNullCheckAndAssign
"""
}

// If the function can return null, we do an extra check to make sure our null bit is still set
// correctly.
val postNullCheck = if (ctx.defaultValue(dataType) == "null") {
s"${ev.isNull} = ${ev.value} == null;"
} else {
""
}

val code = s"""
${obj.code}
boolean ${ev.isNull} = true;
Expand All @@ -254,7 +255,6 @@ case class Invoke(
if (!${ev.isNull}) {
$evaluate
}
$postNullCheck
}
"""
ev.copy(code = code)
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,16 @@ class DatasetPrimitiveSuite extends QueryTest with SharedSQLContext {
checkDataset(dsBoolean.map(e => !e), false, true)
}

test("mapPrimitiveArray") {
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do these tests fail before this PR?

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No, I have just added to confirm this check works well.

val dsInt = Seq(Array(1, 2), Array(3, 4)).toDS()
checkDataset(dsInt.map(e => e), Array(1, 2), Array(3, 4))
checkDataset(dsInt.map(e => null: Array[Int]), null, null)

val dsDouble = Seq(Array(1D, 2D), Array(3D, 4D)).toDS()
checkDataset(dsDouble.map(e => e), Array(1D, 2D), Array(3D, 4D))
checkDataset(dsDouble.map(e => null: Array[Double]), null, null)
}

test("filter") {
val ds = Seq(1, 2, 3, 4).toDS()
checkDataset(
Expand Down