[components] fix returns validator (#27702)

currently we validate return values using the table mapping from the before the UDF runs.  suppose the validator is `v.id("mytable")` and the UDF _creates_ the table `"mytable"` via an insert, and returns the ID. This would fail return value validation.

GitOrigin-RevId: 638b92d8728494a0e04608416ab48767e5e68150

Author: ldanilek

crates/isolate/src/environment/udf/async_syscall.rs

@@ -469,10 +469,6 @@ impl<RT: Runtime> AsyncSyscallProvider<RT> for DatabaseUdfEnvironment<RT> {
         let (_, called_component_id) = BootstrapComponentsModel::new(tx)
             .component_path_to_ids(function_path.component.clone())
             .await?;
-        let table_mapping = tx.table_mapping().namespace(called_component_id.into());
-        let virtual_table_mapping = tx
-            .virtual_table_mapping()
-            .namespace(called_component_id.into());
 
         let path_and_args_result = ValidatedPathAndArgs::new_with_returns_validator(
             AllowedVisibility::PublicOnly,
@@ -533,6 +529,11 @@ impl<RT: Runtime> AsyncSyscallProvider<RT> for DatabaseUdfEnvironment<RT> {
                 anyhow::bail!(ErrorMetadata::bad_request("UdfFailed", e.message));
             },
         };
+        let tx = self.phase.tx()?;
+        let table_mapping = tx.table_mapping().namespace(called_component_id.into());
+        let virtual_table_mapping = tx
+            .virtual_table_mapping()
+            .namespace(called_component_id.into());
         if let Some(e) =
             returns_validator.check_output(&result, &table_mapping, &virtual_table_mapping)
         {