{"action":"created","issue":{"url":"https://api.github.com/repos/apache/drill/issues/1106","repository_url":"https://api.github.com/repos/apache/drill","labels_url":"https://api.github.com/repos/apache/drill/issues/1106/labels{/name}","comments_url":"https://api.github.com/repos/apache/drill/issues/1106/comments","events_url":"https://api.github.com/repos/apache/drill/issues/1106/events","html_url":"https://github.com/apache/drill/pull/1106","id":293389691,"number":1106,"title":"DRILL-6129: Fixed query failure due to nested column data type change","user":{"login":"sachouche","id":29960235,"avatar_url":"https://avatars1.githubusercontent.com/u/29960235?v=4","gravatar_id":"","url":"https://api.github.com/users/sachouche","html_url":"https://github.com/sachouche","followers_url":"https://api.github.com/users/sachouche/followers","following_url":"https://api.github.com/users/sachouche/following{/other_user}","gists_url":"https://api.github.com/users/sachouche/gists{/gist_id}","starred_url":"https://api.github.com/users/sachouche/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sachouche/subscriptions","organizations_url":"https://api.github.com/users/sachouche/orgs","repos_url":"https://api.github.com/users/sachouche/repos","events_url":"https://api.github.com/users/sachouche/events{/privacy}","received_events_url":"https://api.github.com/users/sachouche/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":4,"created_at":"2018-02-01T03:15:25Z","updated_at":"2018-02-01T23:31:15Z","closed_at":"2018-02-01T23:31:15Z","author_association":"CONTRIBUTOR","pull_request":{"url":"https://api.github.com/repos/apache/drill/pulls/1106","html_url":"https://github.com/apache/drill/pull/1106","diff_url":"https://github.com/apache/drill/pull/1106.diff","patch_url":"https://github.com/apache/drill/pull/1106.patch"},"body":"Problem Description -\r\n- The Drillbit was able to successfully send batches containing different metadata (for nested columns)\r\n- This was the case when one or multiple scanners were involved\r\n- The issue happened within the client where value vectors are cached across batches\r\n- The load(...) API is responsible for updating values vectors when a new batch arrives\r\n- The RecordBatchLoader class is used to detect schema changes ; if this is the case, then previous value vectors are discarded and new ones created\r\n- There is a bug with the current implementation where only first level columns are compared\r\n\r\nFix -\r\n- The fix is to improve the schema diff logic by including nested columns"},"comment":{"url":"https://api.github.com/repos/apache/drill/issues/comments/362437002","html_url":"https://github.com/apache/drill/pull/1106#issuecomment-362437002","issue_url":"https://api.github.com/repos/apache/drill/issues/1106","id":362437002,"user":{"login":"sachouche","id":29960235,"avatar_url":"https://avatars1.githubusercontent.com/u/29960235?v=4","gravatar_id":"","url":"https://api.github.com/users/sachouche","html_url":"https://github.com/sachouche","followers_url":"https://api.github.com/users/sachouche/followers","following_url":"https://api.github.com/users/sachouche/following{/other_user}","gists_url":"https://api.github.com/users/sachouche/gists{/gist_id}","starred_url":"https://api.github.com/users/sachouche/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sachouche/subscriptions","organizations_url":"https://api.github.com/users/sachouche/orgs","repos_url":"https://api.github.com/users/sachouche/repos","events_url":"https://api.github.com/users/sachouche/events{/privacy}","received_events_url":"https://api.github.com/users/sachouche/received_events","type":"User","site_admin":false},"created_at":"2018-02-01T23:31:15Z","updated_at":"2018-02-01T23:31:15Z","author_association":"CONTRIBUTOR","body":"Thank you Aman and Paul for reviewing this JIRA. I have created a new JIRA [DRILL-6131](https://issues.apache.org/jira/browse/DRILL-6131) to track the new SchemaComparator utility for sharing schema comparison logic."}}
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