imback82 commented on a change in pull request #30881:
URL: https://github.com/apache/spark/pull/30881#discussion_r547595762
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/v2Commands.scala
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@@ -344,10 +344,11 @@ case class DescribeRelation(
*/
case class DescribeColumn(
relation: LogicalPlan,
- colNameParts: Seq[String],
+ column: NamedExpression,
isExtended: Boolean) extends Command {
override def children: Seq[LogicalPlan] = Seq(relation)
override def output: Seq[Attribute] =
DescribeCommandSchema.describeColumnAttributes()
+ override lazy val references: AttributeSet = AttributeSet.empty
Review comment:
The issue is that in the following check,
https://github.com/apache/spark/blob/303b8c87737fdff83c96855084c16d6504b0b50f/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala#L612-L618
`missingInput` (which is `references -- inputSet`) will be non-empty since
`references` will be from `expressions` and `inputSet` will be empty since we
are setting `ResolvedTable`'s output to `Nil`.
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