After git merge, there will be one more merge submission, and the merge submission has more than one parent submission. What is the content of this merge submission?

after merging branch, git merge, there is one more merge commit. What is the content of this merge submission?

In the

figure, C6 is a merge submission. What is the content of C6?

Git
Mar.12,2021

C5 + C4?

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-64f5-1e412bd-433ee.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e412bd-433ee.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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