Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13976#discussion_r69395123
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala
 ---
    @@ -195,3 +195,38 @@ case class Explode(child: Expression) extends 
ExplodeBase(child, position = fals
       extended = "> SELECT _FUNC_(array(10,20));\n  0\t10\n  1\t20")
     // scalastyle:on line.size.limit
     case class PosExplode(child: Expression) extends ExplodeBase(child, 
position = true)
    +
    +/**
    + * Explodes an array of structs into a table.
    + */
    +@ExpressionDescription(
    +  usage = "_FUNC_(a) - Explodes an array of structs into a table.",
    +  extended = "> SELECT _FUNC_(array(struct(1, 'a'), struct(2, 'b')));\n  
[1,a]\n  [2,b]")
    +case class Inline(child: Expression) extends UnaryExpression with 
Generator with CodegenFallback {
    +
    +  override def children: Seq[Expression] = child :: Nil
    +
    +  override def checkInputDataTypes(): TypeCheckResult = child.dataType 
match {
    +    case ArrayType(et, _) if et.isInstanceOf[StructType] =>
    +      TypeCheckResult.TypeCheckSuccess
    +    case _ =>
    +      TypeCheckResult.TypeCheckFailure(
    +        s"input to function $prettyName should be array of struct type, 
not ${child.dataType}")
    +  }
    +
    +  override def elementSchema: StructType = child.dataType match {
    +    case ArrayType(et : StructType, _) => et
    +  }
    +
    +  private lazy val numFields = elementSchema.fields.length
    +
    +  override def eval(input: InternalRow): TraversableOnce[InternalRow] = {
    +    val inputArray = child.eval(input).asInstanceOf[ArrayData]
    +    if (inputArray == null) {
    +      Nil
    +    } else {
    +      for (i <- 0 until inputArray.numElements())
    +        yield inputArray.getStruct(i, numFields)
    --- End diff --
    
    ah i see, `for-yield` returns an iterator.


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