Command Contract — Eagerly-Executed Logical Operator

Command is the marker interface for logical operators that represent non-query commands that are executed early in the query plan lifecycle (unlike logical plans in general).

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

Command has no output schema by default.

Command has no child logical operators (which makes it similar to leaf logical operators).

Table 1. Commands (Direct Implementations)
Command Description



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