rename median to approx_median

Author: realno

datafusion/tests/sql/aggregates.rs

@@ -224,7 +224,7 @@ async fn csv_query_median_1() -> Result<()> {
     let mut ctx = ExecutionContext::new();
     register_aggregate_csv(&mut ctx).await?;
     let sql = "SELECT approx_median(c2) FROM aggregate_test_100";
-    let mut actual = execute(&mut ctx, sql).await;
+    let actual = execute(&mut ctx, sql).await;
     let expected = vec![vec!["3"]];
     assert_float_eq(&expected, &actual);
     Ok(())
@@ -235,7 +235,7 @@ async fn csv_query_median_2() -> Result<()> {
     let mut ctx = ExecutionContext::new();
     register_aggregate_csv(&mut ctx).await?;
     let sql = "SELECT approx_median(c6) FROM aggregate_test_100";
-    let mut actual = execute(&mut ctx, sql).await;
+    let actual = execute(&mut ctx, sql).await;
     let expected = vec![vec!["1146409980542786560"]];
     assert_float_eq(&expected, &actual);
     Ok(())
@@ -246,7 +246,7 @@ async fn csv_query_median_3() -> Result<()> {
     let mut ctx = ExecutionContext::new();
     register_aggregate_csv(&mut ctx).await?;
     let sql = "SELECT approx_median(c12) FROM aggregate_test_100";
-    let mut actual = execute(&mut ctx, sql).await;
+    let actual = execute(&mut ctx, sql).await;
     let expected = vec![vec!["0.5550065410522981"]];
     assert_float_eq(&expected, &actual);
     Ok(())