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Showing content from https://docs.rs/datafusion/latest/datafusion/logical_expr/enum.InvariantLevel.html below:

InvariantLevel in datafusion::logical_expr - Rust

pub enum InvariantLevel {
    Always,
    Executable,
}

Invariants that are always true in DataFusion LogicalPlans such as the number of expected children and no duplicated output fields

Invariants that must hold true for the plan to be “executable” such as the type and number of function arguments are correct and that wildcards have been expanded

To ensure a LogicalPlan satisfies the Executable invariants, run the Analyzer

Tests for self and other values to be equal, and is used by ==.

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

This method returns an ordering between

and

values if one exists.

Tests less than (for

and

) and is used by the

operator.

Tests less than or equal to (for

and

) and is used by the

operator.

Tests greater than (for

and

) and is used by the

operator.

Tests greater than or equal to (for

and

) and is used by the

operator.

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