pub fn count(expr: Expr) -> Expr {
    Expr::AggregateFunction {
        fun: aggregates::AggregateFunction::Count,
        args: vec![expr],
    }
}
/// Create an expression to represent the count() aggregate function
Create an expression to represent the count() aggregate function
Create an expression to represent the count () aggregate function
pub fn count(expr: Expr) -> Expr {
    Expr::AggregateFunction {
        fun: aggregates::AggregateFunction::Count,
        args: vec![expr],
    }
}
pub fn count ( expr : Expr ) -> Expr { Expr :: AggregateFunction { fun : aggregates :: AggregateFunction :: Count , args : vec ! [ expr ] , } }
Create an expression to represent the count() aggregate function
Create an expression to represent the count () aggregate function
expr
Expr