{"action":"opened","issue":{"url":"https://api.github.com/repos/nathanmarz/cascalog/issues/286","labels_url":"https://api.github.com/repos/nathanmarz/cascalog/issues/286/labels{/name}","comments_url":"https://api.github.com/repos/nathanmarz/cascalog/issues/286/comments","events_url":"https://api.github.com/repos/nathanmarz/cascalog/issues/286/events","html_url":"https://github.com/nathanmarz/cascalog/issues/286","id":79040420,"number":286,"title":"cascalog.api/union (and combine) don't work with taps and flows","user":{"login":"ipostelnik","id":308114,"avatar_url":"https://avatars.githubusercontent.com/u/308114?v=3","gravatar_id":"","url":"https://api.github.com/users/ipostelnik","html_url":"https://github.com/ipostelnik","followers_url":"https://api.github.com/users/ipostelnik/followers","following_url":"https://api.github.com/users/ipostelnik/following{/other_user}","gists_url":"https://api.github.com/users/ipostelnik/gists{/gist_id}","starred_url":"https://api.github.com/users/ipostelnik/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ipostelnik/subscriptions","organizations_url":"https://api.github.com/users/ipostelnik/orgs","repos_url":"https://api.github.com/users/ipostelnik/repos","events_url":"https://api.github.com/users/ipostelnik/events{/privacy}","received_events_url":"https://api.github.com/users/ipostelnik/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-05-21T15:18:20Z","updated_at":"2015-05-21T15:18:20Z","closed_at":null,"body":"cascalog.api/union and cascalog.api/combine only work with queries. A common pattern in our code is to do (combine (select-fields tap1 FIELDS) (select-fields tap2 FIELDS)). This construct used to work in 1.x, but doesn't in 2+. The workarounds are to drop down to cascading DSL or to wrap select with a noop query. "}}