make hash simple.

Author: Rachelint

datafusion/physical-plan/src/aggregates/group_values/single_group_by/primitive.rs

@@ -56,10 +56,30 @@ macro_rules! hash_integer {
         })+
     };
 }
-hash_integer!(i8, i16, i32, i64, i128, i256);
-hash_integer!(u8, u16, u32, u64);
+
+hash_integer!(i128, i256);
 hash_integer!(IntervalDayTime, IntervalMonthDayNano);
 
+
+macro_rules! hash_integer_simple {
+    ($($t:ty),+) => {
+        $(impl HashValue for $t {
+            #[cfg(not(feature = "force_hash_collisions"))]
+            fn hash(&self, _state: &RandomState) -> u64 {
+                *self as u64
+            }
+
+            #[cfg(feature = "force_hash_collisions")]
+            fn hash(&self, _state: &RandomState) -> u64 {
+                0
+            }
+        })+
+    };
+}
+
+hash_integer_simple!(i8, i16, i32, i64);
+hash_integer_simple!(u8, u16, u32, u64);
+
 macro_rules! hash_float {
     ($($t:ty),+) => {
         $(impl HashValue for $t {