Vue element automatically sums columns after merging

after merging the rows, the sum is calculated separately, but it is not possible to use the method that comes with element. If you loop into the sum from the background, how to fix the last two lines and the effect you want to achieve.
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Mar.25,2021

when merging cells, assign the value of cells that do not need to be summed to 0

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-64f5-1b380d5-2c10f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b380d5-2c10f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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