[teiid-issues] [JBoss JIRA] (TEIID-1841) week function in teiid not returning expected value

[Graeme Gillies (Created) (JIRA)]

week function in teiid not returning expected value
---------------------------------------------------

                 Key: TEIID-1841
                 URL: https://issues.jboss.org/browse/TEIID-1841
             Project: Teiid
          Issue Type: Bug
    Affects Versions: 7.5
         Environment: Teiid 7.5 running on java 1.6 openjdk on rhel5
            Reporter: Graeme Gillies
            Assignee: Steven Hawkins


One of our users of our teiid instance as reported that the week function (to determine which week of the year it is) operates in teiid a little different to how they expect.

Teiid resets the week count to 1 on every 1st of January even though
the day is not the 1st day of the week (Sunday in here).
But Postgres will only resets the week count to 1 only on the 1st Monday
of the year.

The examples below compare the results return by teiid and Postgres:

{noformat}
# Teiid result:

EngVDBR=> select week(parsedate('2011-01-01', 'yyyy-MM-dd')) AS Week;
week
------
1
(1 row)

EngVDBR=> select week(parsedate('2011-01-02', 'yyyy-MM-dd')) AS Week;
week
------
2
(1 row)
{noformat}

{noformat}
# Postgres result:

postgres=> SELECT EXTRACT(WEEK FROM DATE '2011-01-01') AS Week;
week
------
52
(1 row)


postgres=> SELECT EXTRACT(WEEK FROM DATE '2011-01-03') AS Week;
week
------
1
(1 row)
{noformat}

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