Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/16608#discussion_r96294261
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1621,9 +1621,11 @@ class Analyzer(
/** Extracts a [[Generator]] expression and any names assigned by
aliases to their output. */
private object AliasedGenerator {
- def unapply(e: Expression): Option[(Generator, Seq[String])] = e
match {
- case Alias(g: Generator, name) if g.resolved => Some((g, name ::
Nil))
- case MultiAlias(g: Generator, names) if g.resolved => Some(g,
names)
+ def unapply(e: Expression): Option[(Generator, Seq[String],
Boolean)] = e match {
--- End diff --
document what the return value means (especially that boolean value, but
also the Seq[String] that's preexisting)
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