dbms: additions [#METR-15987].

dbms/include/DB/Functions/FunctionsTransform.h

@@ -729,27 +729,33 @@ private:
 
 		if (arguments.size() == 4)
 		{
-			const IColumnConst * default_col = dynamic_cast<const IColumnConst *>(&*block.getByPosition(arguments[3]).column);
+			const IColumn * default_col = block.getByPosition(arguments[3]).column.get();
+			const IColumnConst * const_default_col = dynamic_cast<const IColumnConst *>(default_col);
 
-			if (default_col)
+			if (const_default_col)
+				const_default_value = (*const_default_col)[0];
+
+			/// Нужно ли преобразовать элементы to и default_value к наименьшему общему типу, который является Float64?
+			bool default_col_is_float =
+				   typeid_cast<const ColumnFloat32 *>(default_col)
+				|| typeid_cast<const ColumnFloat64 *>(default_col)
+				|| typeid_cast<const ColumnConstFloat32 *>(default_col)
+				|| typeid_cast<const ColumnConstFloat64 *>(default_col);
+
+			bool to_is_float = to[0].getType() == Field::Types::Float64;
+
+			if (default_col_is_float && !to_is_float)
 			{
-				const_default_value = (*default_col)[0];
+				converted_to.resize(to.size());
-
+				for (size_t i = 0, size = to.size(); i < size; ++i)
-				/// Нужно ли преобразовать элементы to и default_value к наименьшему общему типу, который является Float64?
+					converted_to[i] = apply_visitor(FieldVisitorConvertToNumber<Float64>(), to[i]);
-				if (const_default_value.getType() == Field::Types::Float64 && to[0].getType() != Field::Types::Float64)
+				used_to = &converted_to;
-				{
+			}
-					converted_to.resize(to.size());
+			else if (!default_col_is_float && to_is_float)
-					for (size_t i = 0, size = to.size(); i < size; ++i)
+			{
-						converted_to[i] = apply_visitor(FieldVisitorConvertToNumber<Float64>(), to[i]);
+				if (const_default_col)
-					used_to = &converted_to;
+					const_default_value = apply_visitor(FieldVisitorConvertToNumber<Float64>(), const_default_value);
-				}
-				else if (const_default_value.getType() != Field::Types::Float64 && to[0].getType() == Field::Types::Float64)
-				{
-					const_default_value = apply_visitor(FieldVisitorConvertToNumber<Float64>(), const_default_value);
-				}
 			}
-
-			/// TODO Преобразование для to в случае неконстантного default
 		}
 
 		/// Замечание: не делается проверка дубликатов в массиве from.

dbms/tests/queries/0_stateless/00165_transform_non_const_default.reference

@@ -0,0 +1,84 @@
+9999
+9999
+9999
+111
+9999
+222
+9999
+333
+9999
+9999
+
+
+
+hello
+
+world
+
+abc
+
+
+
+
+
+hello
+
+world
+
+abc
+
+
+-
+-
+-
+hello
+-
+world
+-
+abc
+-
+-
+0
+0
+0
+111
+0
+222
+0
+333
+0
+0
+-1
+-1
+-1
+111
+-1
+222
+-1
+333
+-1
+-1
+-1.1
+-1.1
+-1.1
+111
+-1.1
+222
+-1.1
+333
+-1.1
+-1.1
+1
+1
+1
+111
+1
+222.2
+1
+333
+1
+1
+Остальные
+Яндекс
+Google
+Остальные

dbms/tests/queries/0_stateless/00165_transform_non_const_default.sql

@@ -0,0 +1,12 @@
+SELECT transform(number, [3, 5, 7], [111, 222, 333], materialize(9999)) FROM system.numbers LIMIT 10;
+SELECT transform(number, [3, 5, 7], ['hello', 'world', 'abc'], materialize('')) FROM system.numbers LIMIT 10;
+SELECT transform(toString(number), ['3', '5', '7'], ['hello', 'world', 'abc'], materialize('')) FROM system.numbers LIMIT 10;
+SELECT transform(toString(number), ['3', '5', '7'], ['hello', 'world', 'abc'], materialize('-')) FROM system.numbers LIMIT 10;
+SELECT transform(toString(number), ['3', '5', '7'], [111, 222, 333], materialize(0)) FROM system.numbers LIMIT 10;
+SELECT transform(toString(number), ['3', '5', '7'], [111, 222, 333], materialize(-1)) FROM system.numbers LIMIT 10;
+SELECT transform(toString(number), ['3', '5', '7'], [111, 222, 333], materialize(-1.1)) FROM system.numbers LIMIT 10;
+SELECT transform(toString(number), ['3', '5', '7'], [111, 222.2, 333], materialize(1)) FROM system.numbers LIMIT 10;
+SELECT transform(1, [2, 3], ['Яндекс', 'Google'], materialize('Остальные')) AS title;
+SELECT transform(2, [2, 3], ['Яндекс', 'Google'], materialize('Остальные')) AS title;
+SELECT transform(3, [2, 3], ['Яндекс', 'Google'], materialize('Остальные')) AS title;
+SELECT transform(4, [2, 3], ['Яндекс', 'Google'], materialize('Остальные')) AS title;