fix single-threaded case

nickitat · nickitat · commit 36dba0f473cb · 2025-04-06T18:46:15.000+01:00
diff --git a/src/AggregateFunctions/AggregateFunctionUniq.h b/src/AggregateFunctions/AggregateFunctionUniq.h
@@ -276,7 +276,7 @@ struct Adder
 {
     /// We have to introduce this template parameter (and a bunch of ugly code dealing with it), because we cannot
     /// add runtime branches in whatever_hash_set::insert - it will immediately pop up in the perf top.
-    template <SetLevelHint hint = SetLevelHint::unknown>
+    template <SetLevelHint hint = Data::is_able_to_parallelize_merge ? SetLevelHint::unknown : SetLevelHint::singleLevel>
     static void ALWAYS_INLINE add(Data & data, const IColumn ** columns, size_t num_args, size_t row_num)
     {
         if constexpr (Data::is_variadic)

Original file line number	Diff line number	Diff line change
`@@ -276,7 +276,7 @@ struct Adder`
`276`	`276`	`{`
`277`	`277`	`/// We have to introduce this template parameter (and a bunch of ugly code dealing with it), because we cannot`
`278`	`278`	`/// add runtime branches in whatever_hash_set::insert - it will immediately pop up in the perf top.`
`279`		`- template <SetLevelHint hint = SetLevelHint::unknown>`
	`279`	`+ template <SetLevelHint hint = Data::is_able_to_parallelize_merge ? SetLevelHint::unknown : SetLevelHint::singleLevel>`
`280`	`280`	`static void ALWAYS_INLINE add(Data & data, const IColumn ** columns, size_t num_args, size_t row_num)`
`281`	`281`	`{`
`282`	`282`	`if constexpr (Data::is_variadic)`