317brian commented on code in PR #15689:
URL: https://github.com/apache/druid/pull/15689#discussion_r1480475160


##########
docs/multi-stage-query/reference.md:
##########
@@ -90,6 +93,93 @@ can precede the column list: `EXTEND (timestamp VARCHAR...)`.
 
 For more information, see [Read external data with 
EXTERN](concepts.md#read-external-data-with-extern).
 
+#### `EXTERN` to export to a destination
+
+`EXTERN` can be used to specify a destination, where the data needs to be 
exported.
+This variation of EXTERN requires one argument, the details of the destination 
as specified below.
+This variation additionally requires an `AS` clause to specify the format of 
the exported rows.

Review Comment:
   ```suggestion
   This variation of EXTERN has two required parts: an argument that details 
the destination and an `AS` clause to specify the format of the exported rows.
   ```



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