nridge marked an inline comment as done.
nridge added inline comments.

================
Comment at: clang-tools-extra/clangd/index/Index.h:77
+struct RelationsRequest {
+  SymbolID Subject;
+  index::SymbolRole Predicate;
----------------
kadircet wrote:
> sorry for missing it in previous iteration. but this should also enable batch 
> queries. let's make this one a `llvm::DenseMap<SymbolID>`.
> And in the callback we should output both the `SymbolID` of the `Subject` and 
> `Object`.
> 
> We have a network based index(internally) and it uses this batch query 
> optimization to get rid of network latency.
What is an example use case for a batch query? In a typical LSP editor, the 
user can only request a type hierarchy for one class at a time.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D62839/new/

https://reviews.llvm.org/D62839



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