cloud-fan commented on a change in pull request #31474:
URL: https://github.com/apache/spark/pull/31474#discussion_r570267617
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/v2Commands.scala
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@@ -325,11 +325,13 @@ case class AlterNamespaceSetLocation(
*/
case class ShowNamespaces(
namespace: LogicalPlan,
- pattern: Option[String]) extends Command {
+ pattern: Option[String],
+ override val output: Seq[Attribute] = ShowNamespaces.OUTPUT) extends
Command {
Review comment:
I think it's better to put the `output` field in the constructor so that
it's more stable (copying the node will not regenerate the output attributes).
It also helps if we want to support self-join later.
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