{"action":"created","comment":{"url":"https://api.github.com/repos/druid-io/druid/pulls/comments/73205460","id":73205460,"diff_hunk":"@@ -42,7 +44,12 @@\n    *\n    * Value cardinality would be 2.\n    *\n-   * @return the value cardinality\n+   * Cardinality may be unknown (e.g. the selector used by IncrementalIndex while reading input rows),\n+   * in which case this method will return -1. If cardinality is unknown, you should assume this\n+   * dimension selector has no dictionary, and avoid calling \"lookupId\" or \"lookupName\" outside of","path":"processing/src/main/java/io/druid/segment/DimensionSelector.java","position":16,"original_position":16,"commit_id":"fdf49dea7cd89daebb797f268ec14c3dfb92b1d7","original_commit_id":"fdf49dea7cd89daebb797f268ec14c3dfb92b1d7","user":{"login":"drcrallen","id":8213081,"avatar_url":"https://avatars.githubusercontent.com/u/8213081?v=3","gravatar_id":"","url":"https://api.github.com/users/drcrallen","html_url":"https://github.com/drcrallen","followers_url":"https://api.github.com/users/drcrallen/followers","following_url":"https://api.github.com/users/drcrallen/following{/other_user}","gists_url":"https://api.github.com/users/drcrallen/gists{/gist_id}","starred_url":"https://api.github.com/users/drcrallen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/drcrallen/subscriptions","organizations_url":"https://api.github.com/users/drcrallen/orgs","repos_url":"https://api.github.com/users/drcrallen/repos","events_url":"https://api.github.com/users/drcrallen/events{/privacy}","received_events_url":"https://api.github.com/users/drcrallen/received_events","type":"User","site_admin":false},"body":"This is a dangerous change. There are lots of places that will break horribly if (prior illegal value) -1 is returned.\r\n\r\nI would feel more comfortable making an exception that is\r\n\r\n```java\r\nclass UnavailableCardinalityException extends UOE{\r\n}\r\n```\r\n\r\nand have things which can handle missing cardinality catch the error.","created_at":"2016-08-02T18:01:09Z","updated_at":"2016-08-02T18:01:09Z","html_url":"https://github.com/druid-io/druid/pull/3312#discussion_r73205460","pull_request_url":"https://api.github.com/repos/druid-io/druid/pulls/3312","_links":{"self":{"href":"https://api.github.com/repos/druid-io/druid/pulls/comments/73205460"},"html":{"href":"https://github.com/druid-io/druid/pull/3312#discussion_r73205460"},"pull_request":{"href":"https://api.github.com/repos/druid-io/druid/pulls/3312"}}},"pull_request":{"url":"https://api.github.com/repos/druid-io/druid/pulls/3312","id":79674078,"html_url":"https://github.com/druid-io/druid/pull/3312","diff_url":"https://github.com/druid-io/druid/pull/3312.diff","patch_url":"https://github.com/druid-io/druid/pull/3312.patch","issue_url":"https://api.github.com/repos/druid-io/druid/issues/3312","number":3312,"state":"open","locked":false,"title":"Fix FilteredAggregators at ingestion time and in groupBy v2 nested queries.","user":{"login":"gianm","id":1214075,"avatar_url":"https://avatars.githubusercontent.com/u/1214075?v=3","gravatar_id":"","url":"https://api.github.com/users/gianm","html_url":"https://github.com/gianm","followers_url":"https://api.github.com/users/gianm/followers","following_url":"https://api.github.com/users/gianm/following{/other_user}","gists_url":"https://api.github.com/users/gianm/gists{/gist_id}","starred_url":"https://api.github.com/users/gianm/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gianm/subscriptions","organizations_url":"https://api.github.com/users/gianm/orgs","repos_url":"https://api.github.com/users/gianm/repos","events_url":"https://api.github.com/users/gianm/events{/privacy}","received_events_url":"https://api.github.com/users/gianm/received_events","type":"User","site_admin":false},"body":"The common theme between the two is they both create \"fake\" DimensionSelectors\r\nthat work on top of Rows. 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The callers, in\r\nturn, can avoid using it in ways that assume it has a dictionary.\r\n\r\nFixes 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