Trait AnalyzerRule

Source

pub trait AnalyzerRule: Debug {
    // Required methods
    fn analyze(
        &self,
        plan: LogicalPlan,
        config: &ConfigOptions,
    ) -> Result<LogicalPlan, DataFusionError>;
    fn name(&self) -> &str;
}

Expand description

AnalyzerRules transform LogicalPlans in some way to make the plan valid prior to the rest of the DataFusion optimization process.

AnalyzerRules are different than an OptimizerRules which must preserve the semantics of the LogicalPlan, while computing results in a more optimal way.

For example, an AnalyzerRule may resolve Exprs into more specific forms such as a subquery reference, or do type coercion to ensure the types of operands are correct.

Use SessionState::add_analyzer_rule to register additional AnalyzerRules.