0759b84d77
Summary: Ref T2450. File blame tends to have the same commit a lot of times, and we don't do lookups like this efficiently right now. In particular, for a file like `__phutil_library_map__.php`, we would issue a query with ~9,000 clauses like this: ``` (repositoryID = 1 AND commitIdentifier LIKE "XYZ%") ``` ...but only a few hundred of those identifiers were unique. Instead, issue only one clause per unique identifier. MySQL also seems to do a little better on "commitIdentifier = X" if we have the full hash, so special case that slightly. Test Plan: - Issuing a query for only unique identifiers dropped the cost from 400ms to 100ms locally. - Swapping to `=` if we have the full hash dropped the cost from 100ms to 75ms locally. Reviewers: chad Reviewed By: chad Maniphest Tasks: T2450 Differential Revision: https://secure.phabricator.com/D14962
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