Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/6178#discussion_r30400249
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -576,6 +576,12 @@ 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.elementTypes.size > 1 => {
+ // In project, we probably give a default name which is not
correct
+ // e.g. SELECT explode(map(key, value)) FROM src;
+ // Let's ignore the specified names for generator in project list
+ Some((g, Nil))
--- End diff --
The DataFrame API allows user to alias `explode` with 2 names like
`df.select(explode($"myMap").as("key" :: "value" :: Nil))`, your change will
break it.
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