Method plan_substring

datafusion/functions/src/planner.rs:51–55

(&self, args: Vec<Expr>)

    #[cfg(feature = "unicode_expressions")]
    fn plan_substring(&self, args: Vec<Expr>) -> Result<PlannerResult<Vec<Expr>>> {
        Ok(PlannerResult::Planned(Expr::ScalarFunction(
            ScalarFunction::new_udf(crate::unicode::substr(), args),
        )))
    }
}