optimize insertFrom of ColumnAggregateFunction to share Aggregate State in some cases

src/Columns/ColumnAggregateFunction.cpp

@@ -279,7 +279,7 @@ void ColumnAggregateFunction::insertRangeFrom(const IColumn & from, size_t start
 
         size_t end = start + length;
         for (size_t i = start; i < end; ++i)
-            insertFrom(from, i);
+            insertFromWithOwnership(from, i);
     }
     else
     {
@@ -448,7 +448,7 @@ void ColumnAggregateFunction::insertData(const char * pos, size_t /*length*/)
     data.push_back(*reinterpret_cast<const AggregateDataPtr *>(pos));
 }
 
-void ColumnAggregateFunction::insertFrom(const IColumn & from, size_t n)
+void ColumnAggregateFunction::insertFromWithOwnership(const IColumn & from, size_t n)
 {
     /// Must create new state of aggregate function and take ownership of it,
     ///  because ownership of states of aggregate function cannot be shared for individual rows,
@@ -458,6 +458,11 @@ void ColumnAggregateFunction::insertFrom(const IColumn & from, size_t n)
     insertMergeFrom(from, n);
 }
 
+void ColumnAggregateFunction::insertFrom(const IColumn & from, size_t n)
+{
+    insertRangeFrom(from, n, 1);
+}
+
 void ColumnAggregateFunction::insertFrom(ConstAggregateDataPtr place)
 {
     ensureOwnership();

src/Columns/ColumnAggregateFunction.h

@@ -98,6 +98,8 @@ private:
 
     ColumnAggregateFunction(const ColumnAggregateFunction & src_);
 
+    void insertFromWithOwnership(const IColumn & from, size_t n);
+
 public:
     ~ColumnAggregateFunction() override;