{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/comments/51409359","id":51409359,"diff_hunk":"@@ -228,11 +229,29 @@ func (n *CaseExpr) Accept(v Visitor) (Node, bool) {\n \treturn v.Leave(n)\n }\n \n+// SubQuery represents a subquery interface.\n+// This interface is implemented in executor and used in plan/evaluator.\n+type SubQuery interface {\n+\tExprNode\n+\n+\t// EvalRows executes the subquery and returns the multi rows with rowCount.\n+\t// rowCount < 0 means no limit.\n+\t// If the ColumnCount is 1, we will return a column result like {1, 2, 3},\n+\t// otherwise, we will return a table result like {{1, 1}, {2, 2}}.\n+\tEvalRows(ctx context.Context, rowCount int) ([]interface{}, error)\n+\n+\t// ColumnCount returns column count for the sub query.\n+\tColumnCount() (int, error)\n+}\n+\n // SubqueryExpr represents a subquery.\n type SubqueryExpr struct {\n \texprNode\n \t// Query is the query SelectNode.\n-\tQuery ResultSetNode\n+\tQuery           ResultSetNode\n+\tSubQuery        SubQuery","path":"ast/expressions.go","position":33,"original_position":33,"commit_id":"0b60991c7c5c0823e7435ad398cb5028f36f6aa4","original_commit_id":"0b60991c7c5c0823e7435ad398cb5028f36f6aa4","user":{"login":"qiuyesuifeng","id":1953644,"avatar_url":"https://avatars.githubusercontent.com/u/1953644?v=3","gravatar_id":"","url":"https://api.github.com/users/qiuyesuifeng","html_url":"https://github.com/qiuyesuifeng","followers_url":"https://api.github.com/users/qiuyesuifeng/followers","following_url":"https://api.github.com/users/qiuyesuifeng/following{/other_user}","gists_url":"https://api.github.com/users/qiuyesuifeng/gists{/gist_id}","starred_url":"https://api.github.com/users/qiuyesuifeng/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/qiuyesuifeng/subscriptions","organizations_url":"https://api.github.com/users/qiuyesuifeng/orgs","repos_url":"https://api.github.com/users/qiuyesuifeng/repos","events_url":"https://api.github.com/users/qiuyesuifeng/events{/privacy}","received_events_url":"https://api.github.com/users/qiuyesuifeng/received_events","type":"User","site_admin":false},"body":"Seems 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