Yes, and they've open sourced part of that here (at least, I think it is related, and is also called "Code Search"): https://github.com/google/codesearch
But, their public code search was not the same as the internal thing, as far as I know. The internal beast sounds kind of awesome. Here's his talk about it from a few years ago: https://www.youtube.com/watch?v=KTJs-0EInW8
I think the really useful thing (beyond a mere search engine that has indexed a lot of source code) is the comprehension of the "guzzintas" and "guzzouttas" of the code, more than merely a naive word search; i.e. knowing how pieces interact, so you can search for functions that work with a particular kind of object, for example, or objects that have the same properties, or code that interacts with the same API you're working with, whatever.
But, their public code search was not the same as the internal thing, as far as I know. The internal beast sounds kind of awesome. Here's his talk about it from a few years ago: https://www.youtube.com/watch?v=KTJs-0EInW8
I think the really useful thing (beyond a mere search engine that has indexed a lot of source code) is the comprehension of the "guzzintas" and "guzzouttas" of the code, more than merely a naive word search; i.e. knowing how pieces interact, so you can search for functions that work with a particular kind of object, for example, or objects that have the same properties, or code that interacts with the same API you're working with, whatever.
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