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//! Physical optimizer traits

use std::sync::Arc;

use crate::config::ConfigOptions;
use crate::{error::Result, physical_plan::ExecutionPlan};

/// `PhysicalOptimizerRule` transforms one ['ExecutionPlan'] into another which
/// computes the same results, but in a potentially more efficient
/// way.
pub trait PhysicalOptimizerRule {
    /// Rewrite `plan` to an optimized form
    fn optimize(
        &self,
        plan: Arc<dyn ExecutionPlan>,
        config: &ConfigOptions,
    ) -> Result<Arc<dyn ExecutionPlan>>;

    /// A human readable name for this optimizer rule
    fn name(&self) -> &str;

    /// A flag to indicate whether the physical planner should valid the rule will not
    /// change the schema of the plan after the rewriting.
    /// Some of the optimization rules might change the nullable properties of the schema
    /// and should disable the schema check.
    fn schema_check(&self) -> bool;
}
