Method expressions

datafusion/functions-window/src/lead_lag.rs:252–256

Handles the case where `NULL` expression is passed as an argument to `lead`/`lag`. The type is refined depending on the default value argument. For more details see:

(&self, expr_args: ExpressionArgs)

    ///
    /// For more details see: <https://github.com/apache/datafusion/issues/12717>
    fn expressions(&self, expr_args: ExpressionArgs) -> Vec<Arc<dyn PhysicalExpr>> {
        parse_expr(expr_args.input_exprs(), expr_args.input_fields())
            .into_iter()
            .collect::<Vec<_>>()
    }

    fn partition_evaluator(
        &self,