[GitHub] [arrow] jorgecarleitao commented on a change in pull request #8079: ARROW-9815: [Rust][DataFusion] Remove the use of Arc/Mutex to protect plan time structures

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

jorgecarleitao commented on a change in pull request #8079:
URL: https://github.com/apache/arrow/pull/8079#discussion_r479779945



##########
File path: rust/datafusion/src/execution/context.rs
##########
@@ -255,26 +253,17 @@ impl ExecutionContext {
 
     /// Register a table using a custom TableProvider so that it can be referenced from SQL
     /// statements executed against this context.
-    pub fn register_table(
-        &mut self,
-        name: &str,
-        provider: Box<dyn TableProvider + Send + Sync>,
-    ) {
-        let mut ctx_state = self.state.lock().expect("failed to lock mutex");
-        ctx_state.datasources.insert(name.to_string(), provider);
+    pub fn register_table(&mut self, name: &str, provider: Box<dyn TableProvider>) {

Review comment:
       I think that we aimed for `TableProvider` to be `Send + Sync` on ARROW-9425 , so that others could use `ExecutionContext` on multi-threaded environments such as Python.
   
   See e.g. the usage [here](https://github.com/jorgecarleitao/datafusion-python/blob/master/src/lib.rs#L57). I think that that code only compiles if `ExecutionContext` is sharable between threads.
   
   




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