{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/comments/39333065","id":39333065,"diff_hunk":"@@ -40,6 +41,10 @@ type Plan interface {\n \t// If index can be used, a new index plan is returned, 'filtered' is true.\n \t// If no index can be used, the original plan is returned and 'filtered' return false.\n \tFilter(ctx context.Context, expr expression.Expression) (p Plan, filtered bool, err error)\n+\n+\t// Next returns the next row of data and rowKeys, nil data means there is no more data to return.\n+\t// Aggregation plan will fetch all the data at the first call.\n+\tNext(ctx context.Context) (row *Row, err 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about when user terminate, we check if the plan implements `io.Closer`, if it does implement it, we call `Close`?\r\n\r\nAnd we can also extract `Filter` method to `Filterer` interface, so we don't need every plan to implement it.","created_at":"2015-09-12T02:52:41Z","updated_at":"2015-09-12T02:52:41Z","html_url":"https://github.com/pingcap/tidb/pull/123#discussion_r39333065","pull_request_url":"https://api.github.com/repos/pingcap/tidb/pulls/123","_links":{"self":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/comments/39333065"},"html":{"href":"https://github.com/pingcap/tidb/pull/123#discussion_r39333065"},"pull_request":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/123"}}},"pull_request":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/123","id":44780197,"html_url":"https://github.com/pingcap/tidb/pull/123","diff_url":"https://github.com/pingcap/tidb/pull/123.diff","patch_url":"https://github.com/pingcap/tidb/pull/123.patch","issue_url":"https://api.github.com/repos/pingcap/tidb/issues/123","number":123,"state":"open","locked":false,"title":"plan: Next 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