Function lambda_var

datafusion/expr/src/expr_fn.rs:738–740

Create an unresolved lambda variable expression The expression tree or [`LogicalPlan`] which owns this variable must be resolved before usage with either [`Expr::resolve_lambda_variables`] or [`LogicalPlan::resolve_lambda_variables`]. [LogicalPlan::resolve_lambda_variables]: crate::LogicalPlan::resolve_lambda_variables

(name: impl Into<String>)

///
/// [LogicalPlan::resolve_lambda_variables]: crate::LogicalPlan::resolve_lambda_variables
pub fn lambda_var(name: impl Into<String>) -> Expr {
    Expr::LambdaVariable(LambdaVariable::new(name.into(), None))
}

/// Extensions for configuring [`Expr::AggregateFunction`] or [`Expr::WindowFunction`]
///