Sonarqube pullrequest quality gate screen

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we are using sonarqube 9.9 LTS.
When performing pull-request analysis on sonarqube, what is it compared to on the screen?
The basic is known as the default branch of sonaruqbe. However, if the sonar.pullrequest.base option is given in the sonar-scanner analysis, will I compare it with the branch designated in the base?

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It’s compared to the branch it’s going to be merged into, which is defined by sonar.pullrequest.base (and many CIs set this automatically for the scanner, it’s typically an exception if you need to set it manually).