houqp commented on a change in pull request #811:
URL: https://github.com/apache/arrow-datafusion/pull/811#discussion_r693222812



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File path: datafusion/Cargo.toml
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@@ -56,9 +56,9 @@ paste = "^1.0"
 num_cpus = "1.13.0"
 chrono = "0.4"
 async-trait = "0.1.41"
-futures = "0.3"
+futures = { version = "0.3", features = ["executor"] }

Review comment:
       > The alternate compromise, which you have partly implemented in this 
PR, is to implement both async and non async versions. This is similar to the 
approach in the C/C++ filesystem api (props to @nealrichardson for the 
pointer), which has both having synchronous and asynchronous APIs.
   
   How about this alternative to reduce the scope of this PR? i.e. implement 
both sync and async, but only use sync API to migrate existing code to the new 
IO abstraction, then work on async propagation as a fast follow up.




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