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).
Command has no output attributes by default.
output is part of the QueryPlan abstraction.
Child Logical Operators¶
Command has no child logical operators by default.
children is part of the TreeNode abstraction.
stats is part of the LogicalPlanStats abstraction.
Command has no Statistics by default.