Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14007#discussion_r69307924
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
---
@@ -215,6 +215,8 @@ abstract class Star extends LeafExpression with
NamedExpression {
case class UnresolvedStar(target: Option[Seq[String]]) extends Star with
Unevaluable {
override def expand(input: LogicalPlan, resolver: Resolver):
Seq[NamedExpression] = {
+ // When the table does not have any column, the input LogicalPlan does
not have any column
+ if (input.output.isEmpty) return Seq.empty[NamedExpression]
--- End diff --
how about we fix the next code block? e.g.
```
if (target.isEmpty) {
// If there is no table specified, use all input attributes.
input.output
} else if (target.get.size == 1) {
// If there is a table, pick out attributes that are part of this table.
input.output.filter(_.qualifier.exists(resolver(_, t.head)))
} else {
...... // the rest
}
```
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