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Different columns for different tables may\n+ * have the same TableIdentities.","path":"presto-spi/src/main/java/com/facebook/presto/spi/ColumnIdentity.java","position":19,"original_position":19,"commit_id":"8fc2a27852f6ed1509b61b089ebff3b24aa59c97","original_commit_id":"175180c6d307ab32d4c3d928255d9139b45b9354","user":{"login":"dain","id":58298,"avatar_url":"https://avatars.githubusercontent.com/u/58298?v=3","gravatar_id":"","url":"https://api.github.com/users/dain","html_url":"https://github.com/dain","followers_url":"https://api.github.com/users/dain/followers","following_url":"https://api.github.com/users/dain/following{/other_user}","gists_url":"https://api.github.com/users/dain/gists{/gist_id}","starred_url":"https://api.github.com/users/dain/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dain/subscriptions","organizations_url":"https://api.github.com/users/dain/orgs","repos_url":"https://api.github.com/users/dain/repos","events_url":"https://api.github.com/users/dain/events{/privacy}","received_events_url":"https://api.github.com/users/dain/received_events","type":"User","site_admin":false},"body":"I don't understand this sentence.  The `ColumnIdentity` class does not have a `TableIdentity`","created_at":"2016-09-16T19:40:08Z","updated_at":"2016-09-16T19:40:08Z","html_url":"https://github.com/prestodb/presto/pull/5335#discussion_r79237497","pull_request_url":"https://api.github.com/repos/prestodb/presto/pulls/5335","_links":{"self":{"href":"https://api.github.com/repos/prestodb/presto/pulls/comments/79237497"},"html":{"href":"https://github.com/prestodb/presto/pull/5335#discussion_r79237497"},"pull_request":{"href":"https://api.github.com/repos/prestodb/presto/pulls/5335"}}},"pull_request":{"url":"https://api.github.com/repos/prestodb/presto/pulls/5335","id":70928404,"html_url":"https://github.com/prestodb/presto/pull/5335","diff_url":"https://github.com/prestodb/presto/pull/5335.diff","patch_url":"https://github.com/prestodb/presto/pull/5335.patch","issue_url":"https://api.github.com/repos/prestodb/presto/issues/5335","number":5335,"state":"open","locked":false,"title":"Table 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