No impact on rankings. Google said this search feature has no impact on rankings. Again, it does not affect how forum pages rank in Google Search for a given query. This is just a new way for people to access this content, and it appears on searches where forum content would have already surfaced in results.
Why we care. Like Google doesn’t show enough forum content, i.e. Reddit, in the search results, Google is now testing showing this content with new features. Google will show the top comments and related comments for these forum results.
We’ve seen Google testing various flavors of this before, but this one seems different.
It is unclear when and if this will fully roll out but Google is testing it now to see how it performs.