[teiid-issues] [JBoss JIRA] (TEIID-4221) HANA translator: incorrect pushdown of week function

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-4221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-4221.
-----------------------------------
    Fix Version/s: 9.0
                   8.12.5
       Resolution: Done


Used an approach similar to the above casting the substring from isoweek to an integer.

> HANA translator: incorrect pushdown of week function
> ----------------------------------------------------
>
>                 Key: TEIID-4221
>                 URL: https://issues.jboss.org/browse/TEIID-4221
>             Project: Teiid
>          Issue Type: Bug
>          Components: Misc. Connectors
>    Affects Versions: 8.12.5
>            Reporter: Jan Stastny
>            Assignee: Steven Hawkins
>             Fix For: 9.0, 8.12.5
>
>
> Hana translator pushes down function week to SAP HANA datasource as its WEEK function. But it is not in accordance with the ISO8601 rule.
> For this standard, HANA has function ISOWEEK, which returns results in following format:
> {code:plain}
> 2000-W01 for date 'Jan 3, 2000'
> {code}
> So it should be possible to push Teiid's WEEK function as:
> {code:sql}
> SUBSTR_REGEXPR('[[:digit:]]{4}\-W([[:digit:]]{2})' IN ISOWEEK(datevalue) GROUP 1)
> {code}
> where 'datevalue' is column of DATE datatype.



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