Command — Eagerly-Executed Logical Operators¶

Command is an extension of the LogicalPlan abstraction for logical operators that are executed early in the query plan lifecycle (unlike logical operators in general).

Command is a marker interface for logical operators that are executed when a Dataset is requested for the logical plan (which is after the query has been analyzed).

Implementations¶

• AlterTable
• CommentOnTable
• DataWritingCommand
• DeleteFromTable
• DescribeRelation
• MergeIntoTable
• RunnableCommand
• SetCatalogAndNamespace
• ShowTableProperties
• ShowTables
• UpdateTable
• V2WriteCommand
• others

Output Attributes¶

output: Seq[Attribute]

Command has no output attributes by default.

output is part of the QueryPlan abstraction.

Child Logical Operators¶

children: Seq[LogicalPlan]

Command has no child logical operators by default.

children is part of the TreeNode abstraction.

Statistics¶

stats: Statistics

stats is part of the LogicalPlanStats abstraction.

Command has no Statistics by default.