imback82 commented on a change in pull request #29880:
URL: https://github.com/apache/spark/pull/29880#discussion_r499065054
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/v2Commands.scala
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@@ -315,6 +315,17 @@ case class DescribeRelation(
override def output: Seq[Attribute] =
DescribeTableSchema.describeTableAttributes()
}
+/**
+ * The logical plan of the DESCRIBE relation_name col_name command that works
for v2 tables.
+ */
+case class DescribeColumn(
+ relation: LogicalPlan,
+ colNameParts: Seq[String],
Review comment:
> A simple idea is to put an `UnresolvedAttribute` here, and analyzer
can do the work for us.
Since we need to have the relation resolved first, we need to match like the
following in the analyzer:
```scala
case DescribeColumn(r: ResolvedTable, u: UnresolvedAttribute, _) =>
...
```
Is that what you had in mind?
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