[jira] [Closed] (FLINK-7730) TableFunction LEFT OUTER joins with ON predicates are broken

["Fabian Hueske (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-7730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fabian Hueske closed FLINK-7730.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 1.3.0
                   1.4.0

Fixed by rejecting queries with predicates in left outer joins against a table function (see sub-issues)

> TableFunction LEFT OUTER joins with ON predicates are broken
> ------------------------------------------------------------
>
>                 Key: FLINK-7730
>                 URL: https://issues.apache.org/jira/browse/FLINK-7730
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API & SQL
>    Affects Versions: 1.4.0, 1.3.2
>            Reporter: Fabian Hueske
>            Assignee: Xingcan Cui
>            Priority: Critical
>             Fix For: 1.4.0, 1.3.0
>
>
> TableFunction left outer joins with predicates in the ON clause are broken. Apparently, the are no tests for this and it has never worked. I observed issues on several layers:
> - Table Function does not correctly validate equality predicate: {{leftOuterJoin(func1('c) as 'd,  'a.cast(Types.STRING) === 'd)}} is rejected because the predicate is not considered as an equality predicate (the cast needs to be pushed down).
> - Plans cannot be correctly translated: {{leftOuterJoin(func1('c) as 'd,  'c === 'd)}} gives an optimizer exception.
> - SQL queries get translated but produce incorrect results. For example {{SELECT a, b, c, d FROM MyTable LEFT OUTER JOIN LATERAL TABLE(tfunc(c)) AS T(d) ON d = c}} returns an empty result if the condition {{d = c}} never returns true. However, the outer side should be preserved and padded with nulls.
> So there seem to be many issues with table function outer joins. Especially, the wrong result produced by SQL queries need to be quickly fixed.



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)