Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/6479#discussion_r31692302
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateProjection.scala
---
@@ -38,201 +42,191 @@ object GenerateProjection extends
CodeGenerator[Seq[Expression], Projection] {
// Make Mutablility optional...
protected def create(expressions: Seq[Expression]): Projection = {
- val tupleLength = ru.Literal(Constant(expressions.length))
- val lengthDef = q"final val length = $tupleLength"
-
/* TODO: Configurable...
val nullFunctions =
- q"""
+ s"""
private final val nullSet = new
org.apache.spark.util.collection.BitSet(length)
final def setNullAt(i: Int) = nullSet.set(i)
final def isNullAt(i: Int) = nullSet.get(i)
"""
*/
- val nullFunctions =
- q"""
- private[this] var nullBits = new
Array[Boolean](${expressions.size})
- override def setNullAt(i: Int) = { nullBits(i) = true }
- override def isNullAt(i: Int) = nullBits(i)
- """.children
-
- val tupleElements = expressions.zipWithIndex.flatMap {
+ val ctx = newCodeGenContext()
+ val columns = expressions.zipWithIndex.map {
case (e, i) =>
- val elementName = newTermName(s"c$i")
- val evaluatedExpression = expressionEvaluator(e)
- val iLit = ru.Literal(Constant(i))
+ s"private ${primitiveForType(e.dataType)} c$i =
${defaultPrimitive(e.dataType)};\n"
+ }.mkString("\n ")
- q"""
- var ${newTermName(s"c$i")}: ${termForType(e.dataType)} = _
+ val initColumns = expressions.zipWithIndex.map {
+ case (e, i) =>
+ val eval = expressionEvaluator(e, ctx)
+ s"""
{
- ..${evaluatedExpression.code}
- if(${evaluatedExpression.nullTerm})
- setNullAt($iLit)
- else {
- nullBits($iLit) = false
- $elementName = ${evaluatedExpression.primitiveTerm}
+ // column$i
+ ${eval.code}
+ nullBits[$i] = ${eval.nullTerm};
+ if(!${eval.nullTerm}) {
+ c$i = ${eval.primitiveTerm};
}
}
- """.children : Seq[Tree]
- }
+ """
+ }.mkString("\n")
- val accessorFailure = q"""scala.sys.error("Invalid ordinal:" + i)"""
- val applyFunction = {
- val cases = (0 until expressions.size).map { i =>
- val ordinal = ru.Literal(Constant(i))
- val elementName = newTermName(s"c$i")
- val iLit = ru.Literal(Constant(i))
+ val getCases = (0 until expressions.size).map { i =>
+ s"case $i: return c$i;"
+ }.mkString("\n ")
- q"if(i == $ordinal) { if(isNullAt($i)) return null else return
$elementName }"
- }
- q"override def apply(i: Int): Any = { ..$cases; $accessorFailure }"
- }
-
- val updateFunction = {
- val cases = expressions.zipWithIndex.map {case (e, i) =>
- val ordinal = ru.Literal(Constant(i))
- val elementName = newTermName(s"c$i")
- val iLit = ru.Literal(Constant(i))
-
- q"""
- if(i == $ordinal) {
- if(value == null) {
- setNullAt(i)
- } else {
- nullBits(i) = false
- $elementName = value.asInstanceOf[${termForType(e.dataType)}]
- }
- return
- }"""
- }
- q"override def update(i: Int, value: Any): Unit = { ..$cases;
$accessorFailure }"
- }
+ val updateCases = expressions.zipWithIndex.map { case (e, i) =>
+ s"case $i: { c$i = (${termForType(e.dataType)})value; return;}"
+ }.mkString("\n ")
val specificAccessorFunctions = nativeTypes.map { dataType =>
- val ifStatements = expressions.zipWithIndex.flatMap {
- // getString() is not used by expressions
- case (e, i) if e.dataType == dataType && dataType != StringType =>
- val elementName = newTermName(s"c$i")
- // TODO: The string of ifs gets pretty inefficient as the row
grows in size.
- // TODO: Optional null checks?
- q"if(i == $i) return $elementName" :: Nil
- case _ => Nil
- }
- dataType match {
- // Row() need this interface to compile
- case StringType =>
- q"""
- override def getString(i: Int): String = {
- $accessorFailure
- }"""
- case other =>
- q"""
- override def ${accessorForType(dataType)}(i: Int):
${termForType(dataType)} = {
- ..$ifStatements;
- $accessorFailure
- }"""
+ val cases = expressions.zipWithIndex.map {
+ case (e, i) if e.dataType == dataType =>
+ s"case $i: return c$i;"
+ case _ => ""
+ }.mkString("\n ")
+ if (cases.count(_ != '\n') > 0) {
+ s"""
+ @Override
+ public ${primitiveForType(dataType)}
${accessorForType(dataType)}(int i) {
+ if (isNullAt(i)) {
+ return ${defaultPrimitive(dataType)};
+ }
+ switch (i) {
+ $cases
+ }
+ return ${defaultPrimitive(dataType)};
+ }"""
+ } else {
+ ""
}
- }
+ }.mkString("\n")
val specificMutatorFunctions = nativeTypes.map { dataType =>
- val ifStatements = expressions.zipWithIndex.flatMap {
- // setString() is not used by expressions
- case (e, i) if e.dataType == dataType && dataType != StringType =>
- val elementName = newTermName(s"c$i")
- // TODO: The string of ifs gets pretty inefficient as the row
grows in size.
- // TODO: Optional null checks?
- q"if(i == $i) { nullBits($i) = false; $elementName = value;
return }" :: Nil
- case _ => Nil
- }
- dataType match {
- case StringType =>
- // MutableRow() need this interface to compile
- q"""
- override def setString(i: Int, value: String) {
- $accessorFailure
- }"""
- case other =>
- q"""
- override def ${mutatorForType(dataType)}(i: Int, value:
${termForType(dataType)}) {
- ..$ifStatements;
- $accessorFailure
- }"""
+ val cases = expressions.zipWithIndex.map {
+ case (e, i) if e.dataType == dataType =>
+ s"case $i: { c$i = value; return; }"
+ case _ => ""
+ }.mkString("\n")
+ if (cases.count(_ != '\n') > 0) {
+ s"""
+ @Override
+ public void ${mutatorForType(dataType)}(int i,
${primitiveForType(dataType)} value) {
+ nullBits[i] = false;
+ switch (i) {
+ $cases
+ }
+ }"""
+ } else {
+ ""
}
- }
+ }.mkString("\n")
val hashValues = expressions.zipWithIndex.map { case (e, i) =>
- val elementName = newTermName(s"c$i")
+ val col = newTermName(s"c$i")
val nonNull = e.dataType match {
- case BooleanType => q"if ($elementName) 0 else 1"
- case ByteType | ShortType | IntegerType => q"$elementName.toInt"
- case LongType => q"($elementName ^ ($elementName >>> 32)).toInt"
- case FloatType => q"java.lang.Float.floatToIntBits($elementName)"
+ case BooleanType => s"$col ? 0 : 1"
+ case ByteType | ShortType | IntegerType | DateType => s"$col"
+ case LongType => s"$col ^ ($col >>> 32)"
+ case FloatType => s"Float.floatToIntBits($col)"
case DoubleType =>
- q"{ val b = java.lang.Double.doubleToLongBits($elementName); (b
^ (b >>>32)).toInt }"
- case _ => q"$elementName.hashCode"
+ s"Double.doubleToLongBits($col) ^ (Double.doubleToLongBits($col)
>>> 32)"
+ case _ => s"$col.hashCode()"
}
- q"if (isNullAt($i)) 0 else $nonNull"
+ s"isNullAt($i) ? 0 : ($nonNull)"
}
- val hashUpdates: Seq[Tree] = hashValues.map(v => q"""result = 37 *
result + $v""": Tree)
+ val hashUpdates: String = hashValues.map( v =>
+ s"""
+ result *= 37; result += $v;"""
+ ).mkString("\n")
- val hashCodeFunction =
- q"""
- override def hashCode(): Int = {
- var result: Int = 37
- ..$hashUpdates
- result
- }
+ val columnChecks = expressions.zipWithIndex.map { case (e, i) =>
+ s"""
+ if (isNullAt($i) != row.isNullAt($i) || !isNullAt($i) &&
!get($i).equals(row.get($i))) {
+ return false;
+ }
"""
+ }.mkString("\n")
- val columnChecks = (0 until expressions.size).map { i =>
- val elementName = newTermName(s"c$i")
- q"if (this.$elementName != specificType.$elementName) return false"
+ val code = s"""
+ import org.apache.spark.sql.Row;
+
+ public SpecificProjection generate($exprType[] expr) {
+ return new SpecificProjection(expr);
}
- val equalsFunction =
- q"""
- override def equals(other: Any): Boolean = other match {
- case specificType: SpecificRow =>
- ..$columnChecks
- return true
- case other => super.equals(other)
- }
- """
+ class SpecificProjection extends ${typeOf[BaseProject]} {
+ private $exprType[] expressions = null;
+
+ public SpecificProjection($exprType[] expr) {
+ expressions = expr;
+ }
- val allColumns = (0 until expressions.size).map { i =>
- val iLit = ru.Literal(Constant(i))
- q"if(isNullAt($iLit)) { null } else { ${newTermName(s"c$i")} }"
+ @Override
+ public Object apply(Object r) {
+ return new SpecificRow(expressions, (Row)r);
+ }
}
- val copyFunction =
- q"override def copy() = new
$genericRowType(Array[Any](..$allColumns))"
-
- val toSeqFunction =
- q"override def toSeq: Seq[Any] = Seq(..$allColumns)"
-
- val classBody =
- nullFunctions ++ (
- lengthDef +:
- applyFunction +:
- updateFunction +:
- equalsFunction +:
- hashCodeFunction +:
- copyFunction +:
- toSeqFunction +:
- (tupleElements ++ specificAccessorFunctions ++
specificMutatorFunctions))
-
- val code = q"""
- final class SpecificRow(i: $rowType) extends $mutableRowType {
- ..$classBody
+ final class SpecificRow extends ${typeOf[BaseMutableRow]} {
--- End diff --
No, because these temporary classes are only used once.
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