alamb commented on code in PR #9239:
URL: https://github.com/apache/arrow-datafusion/pull/9239#discussion_r1504198174


##########
datafusion/core/src/execution/context/mod.rs:
##########
@@ -2247,6 +2292,196 @@ mod tests {
         Ok(())
     }
 
+    #[tokio::test]
+    async fn register_deregister_udf() -> Result<()> {

Review Comment:
   Would it be possible to move these tests to 
https://github.com/apache/arrow-datafusion/blob/main/datafusion/core/tests/user_defined/mod.rs
 
   
   Doing so would make them more discoverable as well as likely shorter as you 
could probably avoid having to define ScalarUDFs



##########
datafusion/core/src/execution/context/mod.rs:
##########
@@ -848,6 +848,21 @@ impl SessionContext {
         self.state.write().register_udwf(Arc::new(f)).ok();
     }
 
+    /// Deregisters a UDF within this context.
+    pub fn deregister_udf(&self, name: &str) {
+        self.state.write().deregister_udf(name).ok();
+    }
+
+    /// Deregisters a UDAF within this context.
+    pub fn deregister_udaf(&self, name: &str) {
+        self.state.write().deregister_udaf(name).ok();
+    }
+
+    /// Deregisters a UDTF within this context.

Review Comment:
   ```suggestion
       /// Deregisters a UDWF within this context.
   ```



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