I tried this in my Grasp account, a search engine that is pre-loaded with all the Hacker News blogs and other select technical website, and builds results in associated degrees of relations from there. It came up with 8 repos searching for:

https://usegrasp.com/search?q=github+%E2%80%9Ctnt_select%E2%80%9D+

Also I want to say, your scenario is troublesome that GitHub itself could not come up with a satisfactory answer. Strange.

Weird, clicking your link github shows me:

(Sorry about that, but we can’t show files that are this big right now.)

I can click the "raw" link, which shows the whole 32k line file, but then I don't know which line you were trying to reference.

Can you give us the specific line number(s) you were interested in?

I know Grep.app can usually do it. It couldn't find your thing

I'm not sure why, but GitHub's search engine, Blackbird, seems to be returning some erroneous results for this query:

• /tnt_select\(.*2\^32/ language:C++ OR language:C
  • https://github.com/search?q=%2Ftnt_select%5C%28.*2%5C%5E32%2F+language%3AC%2B%2B+OR+language%3AC+&type=code&ref=advsearch

Any chance you could narrow down your search to a list of repose that use the library that pulls in tnt_select() function, then clone and manually grep just those, or is it's use too common to index by?

Real funny that even narrowing down GitHub search to just the same repo doesn't help the query results:

• repo:ocelot-inc/ocelotgui ldbms_tnt_select
  • https://github.com/search?q=repo%3Aocelot-inc%2Focelotgui%20ldbms_tnt_select&type=code