Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13976#discussion_r69371397
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala
---
@@ -195,3 +195,42 @@ 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 inline should be array of struct type, not
${child.dataType}")
+ }
+
+ override def elementSchema: StructType = child.dataType match {
+ case ArrayType(et : StructType, _) =>
+ StructType(et.fields.zipWithIndex.map {
--- End diff --
why not return `et` directly?
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