dbms: removed useless code [#METR-16739].

dbms/include/DB/DataStreams/BlockStreamProfileInfo.h

@@ -29,8 +29,6 @@ struct BlockStreamProfileInfo
 	using BlockStreamProfileInfos = std::vector<const BlockStreamProfileInfo *>;
 	BlockStreamProfileInfos nested_infos;
 
-	String column_names;
-
 	/// Собрать BlockStreamProfileInfo для ближайших в дереве источников с именем name. Пример; собрать все info для PartialSorting stream-ов.
 	void collectInfosForStreamsWithName(const char * name, BlockStreamProfileInfos & res) const;
 

dbms/src/DataStreams/BlockStreamProfileInfo.cpp

@@ -52,9 +52,6 @@ void BlockStreamProfileInfo::update(Block & block)
 	++blocks;
 	rows += block.rowsInFirstColumn();
 	bytes += block.bytes();
-
-	if (column_names.empty())
-		column_names = block.dumpNames();
 }