{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/28199732","id":28199732,"diff_hunk":"@@ -1119,8 +1120,8 @@ def Dict(d):\n     class Row(tuple):\n \n         \"\"\" Row in DataFrame \"\"\"\n-        __DATATYPE__ = dataType\n-        __FIELDS__ = tuple(f.name for f in dataType.fields)\n+        __datatype = 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seems that Row will have two reference to dataType, via `_Row__dataType` and `__dataType`, so I'd like to change it to '__dataType__' to avoid double references.","created_at":"2015-04-12T01:01:08Z","updated_at":"2015-04-12T01:01:08Z","html_url":"https://github.com/apache/spark/pull/5445#discussion_r28199732","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/5445","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/28199732"},"html":{"href":"https://github.com/apache/spark/pull/5445#discussion_r28199732"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/5445"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/5445","id":33010290,"html_url":"https://github.com/apache/spark/pull/5445","diff_url":"https://github.com/apache/spark/pull/5445.diff","patch_url":"https://github.com/apache/spark/pull/5445.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/5445","number":5445,"state":"open","locked":false,"title":"[SPARK-6677] [SQL] [PySpark] fix cached classes","user":{"login":"davies","id":40902,"avatar_url":"https://avatars.githubusercontent.com/u/40902?v=3","gravatar_id":"","url":"https://api.github.com/users/davies","html_url":"https://github.com/davies","followers_url":"https://api.github.com/users/davies/followers","following_url":"https://api.github.com/users/davies/following{/other_user}","gists_url":"https://api.github.com/users/davies/gists{/gist_id}","starred_url":"https://api.github.com/users/davies/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davies/subscriptions","organizations_url":"https://api.github.com/users/davies/orgs","repos_url":"https://api.github.com/users/davies/repos","events_url":"https://api.github.com/users/davies/events{/privacy}","received_events_url":"https://api.github.com/users/davies/received_events","type":"User","site_admin":false},"body":"It's possible to have two DataType object with same id (memory address) at different time, we should check the cached classes to 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