{"action":"opened","issue":{"url":"https://api.github.com/repos/blaze/blaze/issues/1352","labels_url":"https://api.github.com/repos/blaze/blaze/issues/1352/labels{/name}","comments_url":"https://api.github.com/repos/blaze/blaze/issues/1352/comments","events_url":"https://api.github.com/repos/blaze/blaze/issues/1352/events","html_url":"https://github.com/blaze/blaze/issues/1352","id":121612513,"number":1352,"title":"Compute with fails to substitute in all symbols","user":{"login":"jcrist","id":2783717,"avatar_url":"https://avatars.githubusercontent.com/u/2783717?v=3","gravatar_id":"","url":"https://api.github.com/users/jcrist","html_url":"https://github.com/jcrist","followers_url":"https://api.github.com/users/jcrist/followers","following_url":"https://api.github.com/users/jcrist/following{/other_user}","gists_url":"https://api.github.com/users/jcrist/gists{/gist_id}","starred_url":"https://api.github.com/users/jcrist/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jcrist/subscriptions","organizations_url":"https://api.github.com/users/jcrist/orgs","repos_url":"https://api.github.com/users/jcrist/repos","events_url":"https://api.github.com/users/jcrist/events{/privacy}","received_events_url":"https://api.github.com/users/jcrist/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-12-11T01:01:53Z","updated_at":"2015-12-11T01:01:53Z","closed_at":null,"body":"```python\r\nIn [71]: df = pd.DataFrame({'a': range(4)*10, 'b': ['apple', 'apple', 'pear', 'banana']*10})\r\n\r\nIn [72]: df2 = bz.symbol('df2', bz.discover(df))\r\n\r\nIn [73]: a = bz.symbol('a', 'int')\r\n\r\nIn [74]: bz.compute(df2.b[df2.a > 2], {df2: df})\r\nOut[74]:\r\n3     banana\r\n7     banana\r\n11    banana\r\n15    banana\r\n19    banana\r\n23    banana\r\n27    banana\r\n31    banana\r\n35    banana\r\n39    banana\r\nName: b, dtype: object\r\n\r\nIn [75]: bz.compute(df2.b[df2.a > a], {df2: df, a: 2})\r\n---------------------------------------------------------------------------\r\nValueError                                Traceback (most recent call last)\r\n<huge dispatch traceback>\r\nValueError: need more than 0 values to unpack\r\n```"}}