JdbcStringBasedStore SQL Server upsert locks on data not key

         upsertRowSql = String.format("MERGE %1$s WITH (TABLOCK) " +
                     "USING (VALUES (?, ?, ?)) AS tmp (%2$s, %3$s, %4$s) " +
                     "ON (%1$s.%2$s = tmp.%2$s) " +
                     "WHEN MATCHED THEN UPDATE SET %3$s = tmp.%3$s, %4$s = tmp.%4$s " +
                     "WHEN NOT MATCHED THEN INSERT (%2$s, %3$s, %4$s) VALUES (tmp.%2$s, tmp.%3$s, tmp.%4$s);",
               getTableName(), config.dataColumnName(), config.timestampColumnName(), config.idColumnName());