{"action":"created","issue":{"url":"https://api.github.com/repos/pivotalsoftware/quickstep/issues/154","repository_url":"https://api.github.com/repos/pivotalsoftware/quickstep","labels_url":"https://api.github.com/repos/pivotalsoftware/quickstep/issues/154/labels{/name}","comments_url":"https://api.github.com/repos/pivotalsoftware/quickstep/issues/154/comments","events_url":"https://api.github.com/repos/pivotalsoftware/quickstep/issues/154/events","html_url":"https://github.com/pivotalsoftware/quickstep/pull/154","id":147538614,"number":154,"title":"Optimizer support for the EXISTS subquery.","user":{"login":"jianqiao","id":2695519,"avatar_url":"https://avatars.githubusercontent.com/u/2695519?v=3","gravatar_id":"","url":"https://api.github.com/users/jianqiao","html_url":"https://github.com/jianqiao","followers_url":"https://api.github.com/users/jianqiao/followers","following_url":"https://api.github.com/users/jianqiao/following{/other_user}","gists_url":"https://api.github.com/users/jianqiao/gists{/gist_id}","starred_url":"https://api.github.com/users/jianqiao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jianqiao/subscriptions","organizations_url":"https://api.github.com/users/jianqiao/orgs","repos_url":"https://api.github.com/users/jianqiao/repos","events_url":"https://api.github.com/users/jianqiao/events{/privacy}","received_events_url":"https://api.github.com/users/jianqiao/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":{"url":"https://api.github.com/repos/pivotalsoftware/quickstep/milestones/4","html_url":"https://github.com/pivotalsoftware/quickstep/milestones/SemiAntiJoin","labels_url":"https://api.github.com/repos/pivotalsoftware/quickstep/milestones/4/labels","id":1695678,"number":4,"title":"SemiAntiJoin","description":null,"creator":{"login":"jianqiao","id":2695519,"avatar_url":"https://avatars.githubusercontent.com/u/2695519?v=3","gravatar_id":"","url":"https://api.github.com/users/jianqiao","html_url":"https://github.com/jianqiao","followers_url":"https://api.github.com/users/jianqiao/followers","following_url":"https://api.github.com/users/jianqiao/following{/other_user}","gists_url":"https://api.github.com/users/jianqiao/gists{/gist_id}","starred_url":"https://api.github.com/users/jianqiao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jianqiao/subscriptions","organizations_url":"https://api.github.com/users/jianqiao/orgs","repos_url":"https://api.github.com/users/jianqiao/repos","events_url":"https://api.github.com/users/jianqiao/events{/privacy}","received_events_url":"https://api.github.com/users/jianqiao/received_events","type":"User","site_admin":false},"open_issues":1,"closed_issues":2,"state":"open","created_at":"2016-04-10T02:13:29Z","updated_at":"2016-04-11T20:04:33Z","due_on":null,"closed_at":null},"comments":6,"created_at":"2016-04-11T20:04:09Z","updated_at":"2016-04-12T05:37:25Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/pivotalsoftware/quickstep/pulls/154","html_url":"https://github.com/pivotalsoftware/quickstep/pull/154","diff_url":"https://github.com/pivotalsoftware/quickstep/pull/154.diff","patch_url":"https://github.com/pivotalsoftware/quickstep/pull/154.patch"},"body":"This PR adds the optimizer support for `EXISTS` subqueries. An `EXISTS` subquery will be converted into _left semi_ hash join or _left anti_ hash join by the `UnnestSubqueries` logical transformation."},"comment":{"url":"https://api.github.com/repos/pivotalsoftware/quickstep/issues/comments/208716360","html_url":"https://github.com/pivotalsoftware/quickstep/pull/154#issuecomment-208716360","issue_url":"https://api.github.com/repos/pivotalsoftware/quickstep/issues/154","id":208716360,"user":{"login":"zuyu","id":2245572,"avatar_url":"https://avatars.githubusercontent.com/u/2245572?v=3","gravatar_id":"","url":"https://api.github.com/users/zuyu","html_url":"https://github.com/zuyu","followers_url":"https://api.github.com/users/zuyu/followers","following_url":"https://api.github.com/users/zuyu/following{/other_user}","gists_url":"https://api.github.com/users/zuyu/gists{/gist_id}","starred_url":"https://api.github.com/users/zuyu/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zuyu/subscriptions","organizations_url":"https://api.github.com/users/zuyu/orgs","repos_url":"https://api.github.com/users/zuyu/repos","events_url":"https://api.github.com/users/zuyu/events{/privacy}","received_events_url":"https://api.github.com/users/zuyu/received_events","type":"User","site_admin":false},"created_at":"2016-04-12T05:37:25Z","updated_at":"2016-04-12T05:37:25Z","body":"LGTM. We should mark the arguments `const` in another separate PR."}}