Added tool 'olap-query-converter' to help get rid of OLAP compatibility layer in server [#STATINFRA-7868].

dbms/src/Server/CMakeLists.txt

@@ -43,3 +43,10 @@ INSTALL(
 
 CREATE_INIT_SCRIPT(clickhouse-server clickhouse-server)
 
+
+add_executable(olap-query-converter
+	olap-query-converter.cpp
+	OLAPQueryParser.cpp
+	OLAPQueryConverter.cpp)
+
+target_link_libraries (olap-query-converter dbms)

dbms/src/Server/olap-query-converter.cpp

@@ -0,0 +1,28 @@
+#include <DB/Common/Exception.h>
+#include "OLAPQueryParser.h"
+#include "OLAPQueryConverter.h"
+
+/** Программа для преобразования запросов к OLAPServer к SQL запросам.
+  */
+
+using namespace DB;
+
+
+int main(int argc, char ** argv)
+try
+{
+	Context context;
+	OLAP::QueryParser parser;
+	OLAP::QueryConverter converter("visits_all", "visits_all");
+
+	OLAP::QueryParseResult olap_query = parser.parse(std::cin);
+	std::string clickhouse_query;
+
+	converter.OLAPServerQueryToClickHouse(olap_query, context, clickhouse_query);
+	std::cout << clickhouse_query << "\n";
+}
+catch (...)
+{
+	std::cerr << getCurrentExceptionMessage(false) << "\n";
+	throw;
+}