datafusion-functions 48.0.0

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//
//   http://www.apache.org/licenses/LICENSE-2.0
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//! SQL planning extensions like [`UserDefinedFunctionPlanner`]

use datafusion_common::Result;
use datafusion_expr::{
    expr::ScalarFunction,
    planner::{ExprPlanner, PlannerResult},
    Expr,
};

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

impl ExprPlanner for UserDefinedFunctionPlanner {
    #[cfg(feature = "datetime_expressions")]
    fn plan_extract(&self, args: Vec<Expr>) -> Result<PlannerResult<Vec<Expr>>> {
        Ok(PlannerResult::Planned(Expr::ScalarFunction(
            ScalarFunction::new_udf(crate::datetime::date_part(), args),
        )))
    }

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

    #[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),
        )))
    }
}