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[SPARK-21072][SQL] TreeNode.mapChildren should only apply to the children node. #18284

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ConeyLiu wants to merge 5 commits into from
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[SPARK-21072][SQL] TreeNode.mapChildren should only apply to the children node. #18284

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f0d5dc9
mapChildren should only apply to Children
ConeyLiu Jun 13, 2017
c3622bb
fix code style and add test case
ConeyLiu Jun 15, 2017
92d4a80
address comments
ConeyLiu Jun 15, 2017
9a9d8af
small fix
ConeyLiu Jun 15, 2017
27fe790
address comments
ConeyLiu Jun 15, 2017
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14 changes: 12 additions & 2 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -340,8 +340,18 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]] extends Product {
arg
}
case tuple@(arg1: TreeNode[_], arg2: TreeNode[_]) =>
val newChild1 = f(arg1.asInstanceOf[BaseType])
val newChild2 = f(arg2.asInstanceOf[BaseType])
val newChild1 = if (containsChild(arg1)) {
f(arg1.asInstanceOf[BaseType])
} else {
arg1.asInstanceOf[BaseType]
}

val newChild2 = if (containsChild(arg2)) {
f(arg2.asInstanceOf[BaseType])
} else {
arg2.asInstanceOf[BaseType]
}

if (!(newChild1 fastEquals arg1) || !(newChild2 fastEquals arg2)) {
changed = true
(newChild1, newChild2)
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21 changes: 20 additions & 1 deletion sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/trees/TreeNodeSuite.scala
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Expand Up @@ -54,13 +54,21 @@ case class ComplexPlan(exprs: Seq[Seq[Expression]])
override def output: Seq[Attribute] = Nil
}

case class ExpressionInMap(map: Map[String, Expression]) extends Expression with Unevaluable {
case class ExpressionInMap(map: Map[String, Expression]) extends Unevaluable {
override def children: Seq[Expression] = map.values.toSeq
override def nullable: Boolean = true
override def dataType: NullType = NullType
override lazy val resolved = true
}

case class SeqTupleExpression(sons: Seq[(Expression, Expression)],
nonSons: Seq[(Expression, Expression)]) extends Unevaluable {
override def children: Seq[Expression] = sons.flatMap(t => Iterator(t._1, t._2))
override def nullable: Boolean = true
override def dataType: NullType = NullType
override lazy val resolved = true
}

case class JsonTestTreeNode(arg: Any) extends LeafNode {
override def output: Seq[Attribute] = Seq.empty[Attribute]
}
Expand Down Expand Up @@ -146,6 +154,17 @@ class TreeNodeSuite extends SparkFunSuite {
assert(actual === Dummy(None))
}

test("mapChildren should only works on children") {
val children = Seq((Literal(1), Literal(2)))
val nonChildren = Seq((Literal(3), Literal(4)))
val before = SeqTupleExpression(children, nonChildren)
val toZero: PartialFunction[Expression, Expression] = { case Literal(_, _) => Literal(0) }
val expect = SeqTupleExpression(Seq((Literal(0), Literal(0))), nonChildren)

val actual = before mapChildren toZero
assert(actual === expect)
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@gczsjdy gczsjdy Jun 15, 2017

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Maybe better to use .equals? Although it will call Object's .equals which is ==.

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@ConeyLiu ConeyLiu Jun 15, 2017

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I'm not sure if I understand it wrongly. === compared to == could provide more information about the error. You can see the follow examples:

scala> assert(1 == 2)
java.lang.AssertionError: assertion failed
  at scala.Predef$.assert(Predef.scala:156)
  ... 32 elided


scala> assert(1 === 2)
<console>:12: error: value === is not a member of Int
       assert(1 === 2)

And also you can check it in https://stackoverflow.com/questions/10489548/what-is-the-triple-equals-operator-in-scala-koans

}

test("preserves origin") {
CurrentOrigin.setPosition(1, 1)
val add = Add(Literal(1), Literal(1))
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