fix: Update comment

Weijun-H · Weijun-H · commit 3a2220776bf9 · 2024-04-27T21:08:20.000+08:00
diff --git a/datafusion/expr/src/expr_fn.rs b/datafusion/expr/src/expr_fn.rs
@@ -215,7 +215,7 @@ pub fn count(expr: Expr) -> Expr {
     ))
 }
 
-/// Create an expression to represent the count_null() aggregate function
+/// Create an expression to represent the COUNT(IS NULL x) aggregate function
 pub fn count_null(expr: Expr) -> Expr {
     Expr::AggregateFunction(AggregateFunction::new(
         aggregate_function::AggregateFunction::Count,

Original file line number	Diff line number	Diff line change
`@@ -215,7 +215,7 @@ pub fn count(expr: Expr) -> Expr {`
`215`	`215`	`))`
`216`	`216`	`}`
`217`	`217`
`218`		`-/// Create an expression to represent the count_null() aggregate function`
	`218`	`+/// Create an expression to represent the COUNT(IS NULL x) aggregate function`
`219`	`219`	`pub fn count_null(expr: Expr) -> Expr {`
`220`	`220`	`Expr::AggregateFunction(AggregateFunction::new(`
`221`	`221`	`aggregate_function::AggregateFunction::Count,`