[GitHub] [arrow-datafusion] houqp commented on issue #824: A global, shared `ExecutionContext`

[GitBox <gi...@apache.org>]

houqp commented on issue #824:
URL: https://github.com/apache/arrow-datafusion/issues/824#issuecomment-894021340


   @yjshen based on the sample code in your io source PR, it looks like you want the following API as a consumer of datafusion:
   
   ```rust
   let ctx = ExecutionContext::get();  // returns global context singleton
   ExecutionContext::set(ctx);  // updates global context singleton
   ```
   
   If so, I think this pattern can be implemented entirely within a self-contained crate that can be published in crates.io. The global singleton context crate could provide a get/set API like so:
   
   ```rust
   let ctx = global_df_ctx::get();
   global_df_ctx::set(ctx);
   ```
   
   The end user experience would stay the same, but the code would be better decoupled and users can choose to opt-in to the feature by simply adding the extension crate as a dependency.


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