From eef0464411bc1d26de3d5a6ff3ea91e4dc09d891 Mon Sep 17 00:00:00 2001
From: zhenxing jiang <jiangzhx@gmail.com>
Date: Wed, 1 Mar 2023 19:33:54 +0800
Subject: [PATCH] add expr_fn::median (#5437)

---
 datafusion/expr/src/expr_fn.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/datafusion/expr/src/expr_fn.rs b/datafusion/expr/src/expr_fn.rs
index c9c35acb254f..325fac57c958 100644
--- a/datafusion/expr/src/expr_fn.rs
+++ b/datafusion/expr/src/expr_fn.rs
@@ -175,6 +175,16 @@ pub fn approx_distinct(expr: Expr) -> Expr {
     ))
 }
 
+/// Calculate the median for `expr`.
+pub fn median(expr: Expr) -> Expr {
+    Expr::AggregateFunction(AggregateFunction::new(
+        aggregate_function::AggregateFunction::Median,
+        vec![expr],
+        false,
+        None,
+    ))
+}
+
 /// Calculate an approximation of the median for `expr`.
 pub fn approx_median(expr: Expr) -> Expr {
     Expr::AggregateFunction(AggregateFunction::new(