Location of the mysql error log

my server is centos7. Why is my log_error stderr instead of the path to a file? The version of mysql I use is 5.7

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Java php mysql
Mar.16,2021

the ability to log errors is turned off, and error messages are output to the standard error output stderr, before the .err error file is turned on.

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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-64f5-1e35905-43003.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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Message : Disk full (/tmp/#sql-temptable-64f5-1e35905-43003.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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