[jira] [Assigned] (FLINK-5524) Support early out for code generated conjunctive conditions

["Kurt Young (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-5524?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kurt Young reassigned FLINK-5524:
---------------------------------

    Assignee: Kurt Young

> Support early out for code generated conjunctive conditions
> -----------------------------------------------------------
>
>                 Key: FLINK-5524
>                 URL: https://issues.apache.org/jira/browse/FLINK-5524
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>    Affects Versions: 1.2.0, 1.1.4, 1.3.0
>            Reporter: Fabian Hueske
>            Assignee: Kurt Young
>
> Currently, all nested conditions for a conjunctive predicate are evaluated before the conjunction is checked.
> A condition like {{(v1 == v2) && (v3 < 5)}} would be compiled into
> {code}
> boolean res1;
> if (v1 == v2) {
>   res1 = true;
> } else {
>   res1 = false;
> }
> boolean res2;
> if (v3 < 5) {
>   res2 = true;
> } else {
>   res2 = false;
> }
> boolean res3;
> if (res1 && res2) {
>   res3 = true;
> } else {
>   res3 = false;
> }
> if (res3) {
>   // emit something
> }
> {code}
> It would be better to leave the generated code as early as possible, e.g., with a {{return}} instead of {{res1 = false}}. The code generator needs a bit of context information for that.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)