Dandandan commented on a change in pull request #503:
URL: https://github.com/apache/arrow-datafusion/pull/503#discussion_r645684310



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File path: datafusion/src/logical_plan/plan.rs
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@@ -50,6 +52,28 @@ pub enum JoinType {
     Anti,
 }
 
+impl FromStr for JoinType {

Review comment:
       IMO it would be better if the python api also used enum (or typed string 
union) too, at least for autocompletion and optional type checking, but keeping 
it for now as strings.




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