{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/45920666","id":45920666,"diff_hunk":"@@ -305,6 +297,10 @@ def input_file_name():\n @since(1.6)\n def isnan(col):\n     \"\"\"An expression that returns true iff the column is NaN.\n+\n+    >>> df = sqlContext.createDataFrame([(1.0, float('nan')), (float('nan'), 2.0)], (\"a\", \"b\"))\n+    >>> df.select(isnan(\"a\").alias(\"r\")).collect()","path":"python/pyspark/sql/functions.py","position":21,"original_position":21,"commit_id":"d47f1e737cc139957990d606cc62f63e8e299b4d","original_commit_id":"d47f1e737cc139957990d606cc62f63e8e299b4d","user":{"login":"rxin","id":323388,"avatar_url":"https://avatars.githubusercontent.com/u/323388?v=3","gravatar_id":"","url":"https://api.github.com/users/rxin","html_url":"https://github.com/rxin","followers_url":"https://api.github.com/users/rxin/followers","following_url":"https://api.github.com/users/rxin/following{/other_user}","gists_url":"https://api.github.com/users/rxin/gists{/gist_id}","starred_url":"https://api.github.com/users/rxin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rxin/subscriptions","organizations_url":"https://api.github.com/users/rxin/orgs","repos_url":"https://api.github.com/users/rxin/repos","events_url":"https://api.github.com/users/rxin/events{/privacy}","received_events_url":"https://api.github.com/users/rxin/received_events","type":"User","site_admin":false},"body":"can you test both string names and columns? e.g.\r\n```python\r\ndf.select(isnan(\"a\").alias(\"r1\"), isnan(df.a).alias(\"r2\")).collect()\r\n```","created_at":"2015-11-25T21:25:35Z","updated_at":"2015-11-25T21:25:35Z","html_url":"https://github.com/apache/spark/pull/9977#discussion_r45920666","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/9977","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/45920666"},"html":{"href":"https://github.com/apache/spark/pull/9977#discussion_r45920666"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/9977"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/9977","id":51847292,"html_url":"https://github.com/apache/spark/pull/9977","diff_url":"https://github.com/apache/spark/pull/9977.diff","patch_url":"https://github.com/apache/spark/pull/9977.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/9977","number":9977,"state":"open","locked":false,"title":"[SPARK-11980] [SQL] Fix json_tuple and add test cases for SPARK-10621","user":{"login":"gatorsmile","id":11567269,"avatar_url":"https://avatars.githubusercontent.com/u/11567269?v=3","gravatar_id":"","url":"https://api.github.com/users/gatorsmile","html_url":"https://github.com/gatorsmile","followers_url":"https://api.github.com/users/gatorsmile/followers","following_url":"https://api.github.com/users/gatorsmile/following{/other_user}","gists_url":"https://api.github.com/users/gatorsmile/gists{/gist_id}","starred_url":"https://api.github.com/users/gatorsmile/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gatorsmile/subscriptions","organizations_url":"https://api.github.com/users/gatorsmile/orgs","repos_url":"https://api.github.com/users/gatorsmile/repos","events_url":"https://api.github.com/users/gatorsmile/events{/privacy}","received_events_url":"https://api.github.com/users/gatorsmile/received_events","type":"User","site_admin":false},"body":"Added test cases for the function `isnan`, `isnull`, `nanvl` and `json_tuple`. \r\n\r\nFixed a bug in the function `json_tuple`  \r\n\r\n@rxin , could you help me review my changes? Please let me know anything is missing. \r\n\r\nThank you! Have a good Thanksgiving day!","created_at":"2015-11-25T21:19:42Z","updated_at":"2015-11-25T21:25:35Z","closed_at":null,"merged_at":null,"merge_commit_sha":"e999d7eb5601feec183f14e616a055a796dae173","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/9977/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/9977/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/9977/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/d47f1e737cc139957990d606cc62f63e8e299b4d","head":{"label":"gatorsmile:json_tuple","ref":"json_tuple","sha":"d47f1e737cc139957990d606cc62f63e8e299b4d","user":{"login":"gatorsmile","id":11567269,"avatar_url":"https://avatars.githubusercontent.com/u/11567269?v=3","gravatar_id":"","url":"https://api.github.com/users/gatorsmile","html_url":"https://github.com/gatorsmile","followers_url":"https://api.github.com/users/gatorsmile/followers","following_url":"https://api.github.com/users/gatorsmile/following{/other_user}","gists_url":"https://api.github.com/users/gatorsmile/gists{/gist_id}","starred_url":"https://api.github.com/users/gatorsmile/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gatorsmile/subscriptions","organizations_url":"https://api.github.com/users/gatorsmile/orgs","repos_url":"https://api.github.com/users/gatorsmile/repos","events_url":"https://api.github.com/users/gatorsmile/events{/privacy}","received_events_url":"https://api.github.com/users/gatorsmile/received_events","type":"User","site_admin":false},"repo":{"id":44710950,"name":"spark","full_name":"gatorsmile/spark","owner":{"login":"gatorsmile","id":11567269,"avatar_url":"https://avatars.githubusercontent.com/u/11567269?v=3","gravatar_id":"","url":"https://api.github.com/users/gatorsmile","html_url":"https://github.com/gatorsmile","followers_url":"https://api.github.com/users/gatorsmile/followers","following_url":"https://api.github.com/users/gatorsmile/following{/other_user}","gists_url":"https://api.github.com/users/gatorsmile/gists{/gist_id}","starred_url":"https://api.github.com/users/gatorsmile/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gatorsmile/subscriptions","organizations_url":"https://api.github.com/users/gatorsmile/orgs","repos_url":"https://api.github.com/users/gatorsmile/repos","events_url":"https://api.github.com/users/gatorsmile/events{/privacy}","received_events_url":"https://api.github.com/users/gatorsmile/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/gatorsmile/spark","description":"Mirror 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