[teiid-issues] [JBoss JIRA] (TEIID-3805) HANA SUBSTRING function inconsistent with teiid behaviour

[Jan Stastny (JIRA)]

Jan Stastny created TEIID-3805:
----------------------------------

             Summary: HANA SUBSTRING function inconsistent with teiid behaviour
                 Key: TEIID-3805
                 URL: https://issues.jboss.org/browse/TEIID-3805
             Project: Teiid
          Issue Type: Bug
          Components: Misc. Connectors
    Affects Versions: 8.7.1.6_2
            Reporter: Jan Stastny
            Assignee: Steven Hawkins


When querying HANA using hana translator, there is an inconsistency in handling SUBSTRING with similar parameters:
{code:sql}
SELECT SUBSTRING('sth',20,1) FROM tablename
{code}
That is, when the starting offset supplied to SUBSTRING function is greater than the length of the string value, Teiid returns NULL in this case. 
But when I run:
{code:sql}
SELECT SUBSTRING(STRINGNUM,20,1) FROM bqt1.smalla
{code}
(it is pushed to HANA and STRINGNUM column contains strings of length <=2)
I get empty strings instead of NULL values, which is default in Teiid.

This inconsistency is caused by different handling of such situation on HANA's side.



--
This message was sent by Atlassian JIRA
(v6.4.11#64026)