Why the table render-header function in element is executed many times

el-table-column is looped out through v-for. Is there anything you need to pay attention to?

Apr.29,2021
I found the reason for

because I created the el-select element in the render-header function. If it is multiple selections, it will be called twice, but not for single selections. The specific reason is not clear

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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-64f5-1b39eaf-2b535.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b39eaf-2b535.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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