diff --git a/datafusion/functions-aggregate/src/regr.rs b/datafusion/functions-aggregate/src/regr.rs
index 8d04ae87157d..aad110a13e13 100644
--- a/datafusion/functions-aggregate/src/regr.rs
+++ b/datafusion/functions-aggregate/src/regr.rs
@@ -153,7 +153,11 @@ impl AggregateUDFImpl for Regr {
             return plan_err!("Covariance requires numeric input types");
         }
 
-        Ok(DataType::Float64)
+        if matches!(self.regr_type, RegrType::Count) {
+            Ok(DataType::UInt64)
+        } else {
+            Ok(DataType::Float64)
+        }
     }
 
     fn accumulator(&self, _acc_args: AccumulatorArgs) -> Result<Box<dyn Accumulator>> {
@@ -480,7 +484,7 @@ impl Accumulator for RegrAccumulator {
                 let nullif_cond = self.count <= 1 || var_pop_x == 0.0;
                 nullif_or_stat(nullif_cond, self.mean_y - slope * self.mean_x)
             }
-            RegrType::Count => Ok(ScalarValue::Float64(Some(self.count as f64))),
+            RegrType::Count => Ok(ScalarValue::UInt64(Some(self.count))),
             RegrType::R2 => {
                 // Only 0/1 point or all x(or y) is the same
                 let nullif_cond = self.count <= 1 || var_pop_x == 0.0 || var_pop_y == 0.0;
diff --git a/datafusion/sqllogictest/test_files/aggregate.slt b/datafusion/sqllogictest/test_files/aggregate.slt
index fa228d499d1f..5cc66bb493ac 100644
--- a/datafusion/sqllogictest/test_files/aggregate.slt
+++ b/datafusion/sqllogictest/test_files/aggregate.slt
@@ -4742,27 +4742,27 @@ select regr_sxy(NULL, 'bar');
 
 
 # regr_*() NULL results
-query RRRRRRRRR
+query RRIRRRRRR
 select regr_slope(1,1), regr_intercept(1,1), regr_count(1,1), regr_r2(1,1), regr_avgx(1,1), regr_avgy(1,1), regr_sxx(1,1), regr_syy(1,1), regr_sxy(1,1);
 ----
 NULL NULL 1 NULL 1 1 0 0 0
 
-query RRRRRRRRR
+query RRIRRRRRR
 select regr_slope(1, NULL), regr_intercept(1, NULL), regr_count(1, NULL), regr_r2(1, NULL), regr_avgx(1, NULL), regr_avgy(1, NULL), regr_sxx(1, NULL), regr_syy(1, NULL), regr_sxy(1, NULL);
 ----
 NULL NULL 0 NULL NULL NULL NULL NULL NULL
 
-query RRRRRRRRR
+query RRIRRRRRR
 select regr_slope(NULL, 1), regr_intercept(NULL, 1), regr_count(NULL, 1), regr_r2(NULL, 1), regr_avgx(NULL, 1), regr_avgy(NULL, 1), regr_sxx(NULL, 1), regr_syy(NULL, 1), regr_sxy(NULL, 1);
 ----
 NULL NULL 0 NULL NULL NULL NULL NULL NULL
 
-query RRRRRRRRR
+query RRIRRRRRR
 select regr_slope(NULL, NULL), regr_intercept(NULL, NULL), regr_count(NULL, NULL), regr_r2(NULL, NULL), regr_avgx(NULL, NULL), regr_avgy(NULL, NULL), regr_sxx(NULL, NULL), regr_syy(NULL, NULL), regr_sxy(NULL, NULL);
 ----
 NULL NULL 0 NULL NULL NULL NULL NULL NULL
 
-query RRRRRRRRR
+query RRIRRRRRR
 select regr_slope(column2, column1), regr_intercept(column2, column1), regr_count(column2, column1), regr_r2(column2, column1), regr_avgx(column2, column1), regr_avgy(column2, column1), regr_sxx(column2, column1), regr_syy(column2, column1), regr_sxy(column2, column1) from (values (1,2), (1,4), (1,6));
 ----
 NULL NULL 3 NULL 1 4 0 8 0
@@ -4770,7 +4770,7 @@ NULL NULL 3 NULL 1 4 0 8 0
 
 
 # regr_*() basic tests
-query RRRRRRRRR
+query RRIRRRRRR
 select 
     regr_slope(column2, column1),
     regr_intercept(column2, column1),
@@ -4785,7 +4785,7 @@ from (values (1,2), (2,4), (3,6));
 ----
 2 0 3 1 2 4 2 8 4
 
-query RRRRRRRRR
+query RRIRRRRRR
 select 
     regr_slope(c12, c11),
     regr_intercept(c12, c11),
@@ -4803,7 +4803,7 @@ from aggregate_test_100;
 
 
 # regr_*() functions ignore NULLs
-query RRRRRRRRR
+query RRIRRRRRR
 select 
     regr_slope(column2, column1),
     regr_intercept(column2, column1),
@@ -4818,7 +4818,7 @@ from (values (1,NULL), (2,4), (3,6));
 ----
 2 0 2 1 2.5 5 0.5 2 1
 
-query RRRRRRRRR
+query RRIRRRRRR
 select 
     regr_slope(column2, column1),
     regr_intercept(column2, column1),
@@ -4833,7 +4833,7 @@ from (values (1,NULL), (NULL,4), (3,6));
 ----
 NULL NULL 1 NULL 3 6 0 0 0
 
-query RRRRRRRRR
+query RRIRRRRRR
 select 
     regr_slope(column2, column1),
     regr_intercept(column2, column1),
@@ -4848,7 +4848,7 @@ from (values (1,NULL), (NULL,4), (NULL,NULL));
 ----
 NULL NULL 0 NULL NULL NULL NULL NULL NULL
 
-query TRRRRRRRRR rowsort
+query TRRIRRRRRR rowsort
 select 
     column3, 
     regr_slope(column2, column1),
@@ -4873,7 +4873,7 @@ c NULL NULL 1 NULL 1 10 0 0 0
 statement ok
 set datafusion.execution.batch_size = 1;
 
-query RRRRRRRRR
+query RRIRRRRRR
 select 
     regr_slope(c12, c11),
     regr_intercept(c12, c11),
@@ -4891,7 +4891,7 @@ from aggregate_test_100;
 statement ok
 set datafusion.execution.batch_size = 2;
 
-query RRRRRRRRR
+query RRIRRRRRR
 select 
     regr_slope(c12, c11),
     regr_intercept(c12, c11),
@@ -4909,7 +4909,7 @@ from aggregate_test_100;
 statement ok
 set datafusion.execution.batch_size = 3;
 
-query RRRRRRRRR
+query RRIRRRRRR
 select 
     regr_slope(c12, c11),
     regr_intercept(c12, c11),
@@ -4930,7 +4930,7 @@ set datafusion.execution.batch_size = 8192;
 
 
 # regr_*() testing retract_batch() from RegrAccumulator's internal implementation
-query RRRRRRRRR
+query RRIRRRRRR
 SELECT
     regr_slope(column2, column1) OVER w AS slope,
     regr_intercept(column2, column1) OVER w AS intercept,
@@ -4951,7 +4951,7 @@ NULL NULL 1 NULL 1 2 0 0 0
 4.5 -7 3 0.964285714286 4 11 2 42 9
 3 0 3 1 5 15 2 18 6
 
-query RRRRRRRRR
+query RRIRRRRRR
 SELECT
     regr_slope(column2, column1) OVER w AS slope,
     regr_intercept(column2, column1) OVER w AS intercept,