johnImply commented on code in PR #13404:
URL: https://github.com/apache/druid/pull/13404#discussion_r1091036180


##########
docs/querying/datasource.md:
##########
@@ -334,7 +336,7 @@ Native join datasources have the following properties. All 
are required.
 |`right`|Right-hand datasource. Must be of type `lookup`, `query`, or 
`inline`. Note that this is more rigid than what Druid SQL requires.|
 |`rightPrefix`|String prefix that will be applied to all columns from the 
right-hand datasource, to prevent them from colliding with columns from the 
left-hand datasource. Can be any string, so long as it is nonempty and is not 
be a prefix of the string `__time`. Any columns from the left-hand side that 
start with your `rightPrefix` will be shadowed. It is up to you to provide a 
prefix that will not shadow any important columns from the left side.|
 |`condition`|[Expression](../misc/math-expr.md) that must be an equality where 
one side is an expression of the left-hand side, and the other side is a simple 
column reference to the right-hand side. Note that this is more rigid than what 
Druid SQL requires: here, the right-hand reference must be a simple column 
reference; in SQL it can be an expression.|
-|`joinType`|`INNER` or `LEFT`.|
+|`joinType`|`INNER`, `LEFT`|
 

Review Comment:
   Full outer join is yet a different (and very important) join mode ... I 
don't think Druid supports it, do we?  It requires different processing because 
there is no driving table.



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