{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/comments/60557105","id":60557105,"diff_hunk":"@@ -100,3 +109,65 @@ func (a *statement) Exec(ctx context.Context) (ast.RecordSet, error) {\n \t\tfields:   fs,\n \t}, nil\n }\n+\n+// subqueryExecutor executes independent subquery.\n+type subqueryExecutor struct {\n+\tctx          context.Context\n+\tmultipleRows bool\n+\texistRow     bool\n+\terr          error\n+}\n+\n+func (e *subqueryExecutor) Enter(in ast.Node) (ast.Node, bool) {\n+\tswitch in.(type) {\n+\tcase *ast.ExistsSubqueryExpr:\n+\t\te.existRow = true\n+\tcase *ast.CompareSubqueryExpr:\n+\t\te.multipleRows = true\n+\tcase *ast.PatternInExpr:\n+\t\te.multipleRows = true\n+\t}\n+\treturn in, false\n+}\n+\n+func (e *subqueryExecutor) Leave(in ast.Node) (ast.Node, bool) {\n+\tswitch x := in.(type) {\n+\tcase *ast.CompareSubqueryExpr:\n+\t\te.multipleRows = false\n+\tcase *ast.PatternInExpr:\n+\t\te.multipleRows = false\n+\tcase *ast.ExistsSubqueryExpr:\n+\t\te.existRow = false","path":"executor/adapter.go","position":55,"original_position":55,"commit_id":"dd70f169205d4ddde0219de0704a88eda84e5f19","original_commit_id":"dd70f169205d4ddde0219de0704a88eda84e5f19","user":{"login":"coocood","id":891222,"avatar_url":"https://avatars.githubusercontent.com/u/891222?v=3","gravatar_id":"","url":"https://api.github.com/users/coocood","html_url":"https://github.com/coocood","followers_url":"https://api.github.com/users/coocood/followers","following_url":"https://api.github.com/users/coocood/following{/other_user}","gists_url":"https://api.github.com/users/coocood/gists{/gist_id}","starred_url":"https://api.github.com/users/coocood/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/coocood/subscriptions","organizations_url":"https://api.github.com/users/coocood/orgs","repos_url":"https://api.github.com/users/coocood/repos","events_url":"https://api.github.com/users/coocood/events{/privacy}","received_events_url":"https://api.github.com/users/coocood/received_events","type":"User","site_admin":false},"body":"There may be multiple subqueries.","created_at":"2016-04-21T10:14:27Z","updated_at":"2016-04-21T10:14:27Z","html_url":"https://github.com/pingcap/tidb/pull/1133#discussion_r60557105","pull_request_url":"https://api.github.com/repos/pingcap/tidb/pulls/1133","_links":{"self":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/comments/60557105"},"html":{"href":"https://github.com/pingcap/tidb/pull/1133#discussion_r60557105"},"pull_request":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/1133"}}},"pull_request":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/1133","id":67304564,"html_url":"https://github.com/pingcap/tidb/pull/1133","diff_url":"https://github.com/pingcap/tidb/pull/1133.diff","patch_url":"https://github.com/pingcap/tidb/pull/1133.patch","issue_url":"https://api.github.com/repos/pingcap/tidb/issues/1133","number":1133,"state":"open","locked":false,"title":"executor: evaluate subquery before executing outer 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