{"action":"created","issue":{"url":"https://api.github.com/repos/demetrixbio/FSharp.Data.Npgsql/issues/20","repository_url":"https://api.github.com/repos/demetrixbio/FSharp.Data.Npgsql","labels_url":"https://api.github.com/repos/demetrixbio/FSharp.Data.Npgsql/issues/20/labels{/name}","comments_url":"https://api.github.com/repos/demetrixbio/FSharp.Data.Npgsql/issues/20/comments","events_url":"https://api.github.com/repos/demetrixbio/FSharp.Data.Npgsql/issues/20/events","html_url":"https://github.com/demetrixbio/FSharp.Data.Npgsql/issues/20","id":314373313,"number":20,"title":"Error converting columns in join","user":{"login":"sandeepc24","id":4897654,"avatar_url":"https://avatars2.githubusercontent.com/u/4897654?v=4","gravatar_id":"","url":"https://api.github.com/users/sandeepc24","html_url":"https://github.com/sandeepc24","followers_url":"https://api.github.com/users/sandeepc24/followers","following_url":"https://api.github.com/users/sandeepc24/following{/other_user}","gists_url":"https://api.github.com/users/sandeepc24/gists{/gist_id}","starred_url":"https://api.github.com/users/sandeepc24/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sandeepc24/subscriptions","organizations_url":"https://api.github.com/users/sandeepc24/orgs","repos_url":"https://api.github.com/users/sandeepc24/repos","events_url":"https://api.github.com/users/sandeepc24/events{/privacy}","received_events_url":"https://api.github.com/users/sandeepc24/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":2,"created_at":"2018-04-15T00:20:22Z","updated_at":"2018-04-15T20:11:51Z","closed_at":"2018-04-15T16:51:45Z","author_association":"NONE","body":"I have a sql where the field in select clause is null and I get following error\r\n\r\n```\r\nAn exception of type 'System.InvalidCastException' occurred in Server.dll but was not handled in user code: 'Unable to cast object of type 'System.DBNull' to type 'System.Guid'.'\r\n```\r\n\r\nThe sql has a join clause.\r\nI think the columns on left joined tables should be wrapped as `option`."},"comment":{"url":"https://api.github.com/repos/demetrixbio/FSharp.Data.Npgsql/issues/comments/381434435","html_url":"https://github.com/demetrixbio/FSharp.Data.Npgsql/issues/20#issuecomment-381434435","issue_url":"https://api.github.com/repos/demetrixbio/FSharp.Data.Npgsql/issues/20","id":381434435,"user":{"login":"sandeepc24","id":4897654,"avatar_url":"https://avatars2.githubusercontent.com/u/4897654?v=4","gravatar_id":"","url":"https://api.github.com/users/sandeepc24","html_url":"https://github.com/sandeepc24","followers_url":"https://api.github.com/users/sandeepc24/followers","following_url":"https://api.github.com/users/sandeepc24/following{/other_user}","gists_url":"https://api.github.com/users/sandeepc24/gists{/gist_id}","starred_url":"https://api.github.com/users/sandeepc24/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sandeepc24/subscriptions","organizations_url":"https://api.github.com/users/sandeepc24/orgs","repos_url":"https://api.github.com/users/sandeepc24/repos","events_url":"https://api.github.com/users/sandeepc24/events{/privacy}","received_events_url":"https://api.github.com/users/sandeepc24/received_events","type":"User","site_admin":false},"created_at":"2018-04-15T20:11:51Z","updated_at":"2018-04-15T20:11:51Z","author_association":"NONE","body":"This breaks at runtime."}}
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