Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/4602#discussion_r28575507
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -473,10 +473,47 @@ class Analyzer(
*/
object ImplicitGenerate extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transform {
- case Project(Seq(Alias(g: Generator, _)), child) =>
- Generate(g, join = false, outer = false, None, child)
+ case Project(Seq(Alias(g: Generator, name)), child) =>
+ Generate(g, join = false, outer = false, child, qualifier = None,
name :: Nil, Nil)
+ case Project(Seq(MultiAlias(g: Generator, names)), child) =>
+ Generate(g, join = false, outer = false, child, qualifier = None,
names, Nil)
}
}
+
+ object ResolveGenerate extends Rule[LogicalPlan] {
+ // Construct the output attributes for the generator,
+ // The output attribute names can be either specified or
+ // auto generated.
+ private def makeGeneratorOutput(
+ generator: Generator,
+ attributeNames: Seq[String],
+ qualifier: Option[String]): Array[Attribute] = {
+ val elementTypes = generator.elementTypes
+
+ val raw = if (attributeNames.size == elementTypes.size) {
--- End diff --
Hive does exactly the same as you listed.
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