recently read the presto source code, do not understand the role of projectNode? only knows that it is used for projection, which can be explained simply. ...
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5 MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b36d54-2c039.MAI); waiting for someone to free some space... (errno: 28 "No space left on device") MySQL Errno : 1021 Message : Disk full (/tmp/#sql-temptable-64f5-1b36d54-2c039.MAI); waiting for someone to free some space... (errno: 28 "No space left on device") Need Help?
