datafusion/functions/src/datetime/planner.rs

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//! SQL planning extensions like [`DatetimeFunctionPlanner`]
use datafusion_expr::expr::ScalarFunction;
use datafusion_expr::planner::{ExprPlanner, PlannerResult};
use datafusion_expr::Expr;

#[derive(Default, Debug)]
pub struct DatetimeFunctionPlanner;

impl ExprPlanner for DatetimeFunctionPlanner {
    fn plan_extract(
        &self,
        args: Vec<Expr>,
    ) -> datafusion_common::Result<PlannerResult<Vec<Expr>>> {
        Ok(PlannerResult::Planned(Expr::ScalarFunction(
            ScalarFunction::new_udf(crate::datetime::date_part(), args),
        )))
    }
}