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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-5276) Reference manual has wrong length for BIGINT columns in system tables
Date Tue, 14 Jun 2011 12:25:48 GMT
Reference manual has wrong length for BIGINT columns in system tables
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                 Key: DERBY-5276
                 URL: https://issues.apache.org/jira/browse/DERBY-5276
             Project: Derby
          Issue Type: Bug
          Components: Documentation
    Affects Versions: 10.9.0.0
            Reporter: Knut Anders Hatlen
            Priority: Minor


The description of the SYSCOLUMNS table at http://db.apache.org/derby/docs/dev/ref/rrefsistabs22441.html
says that the BIGINT columns AUTOINCREMENTVALUE, AUTOINCREMENTSTART and AUTOINCREMENTINC have
length 19. The maximum length of a BIGINT is 20 (when including the sign for negative values).
Here's an example that shows that these columns can hold values whose length is 20:

ij> create table t(x bigint not null generated always as identity (start with -1234567890123456789,
increment by -1234567890123456789));
0 rows inserted/updated/deleted
ij> select autoincrementvalue, autoincrementstart, autoincrementinc from sys.syscolumns
where columnname='X';
AUTOINCREMENTVALUE  |AUTOINCREMENTSTART  |AUTOINCREMENTINC    
--------------------------------------------------------------
-1234567890123456789|-1234567890123456789|-1234567890123456789

1 row selected

Other places where BIGINT columns are listed with length 19:

SYSCONGLOMERATES - http://db.apache.org/derby/docs/dev/ref/rrefsistabs39391.html
SYSFILES - http://db.apache.org/derby/docs/dev/ref/rrefsistabs40972.html
SYSSEQUENCES - http://db.apache.org/derby/docs/dev/ref/rrefsistabssyssequences.html
SYSXPLAIN_RESULTSET_TIMINGS - http://db.apache.org/derby/docs/dev/ref/rrefsysxplain_resultset_timings.html
SYSXPLAIN_STATEMENT_TIMINGS - http://db.apache.org/derby/docs/dev/ref/rrefsysxplain_statement_timings.html
SYSCS_DIAG.SPACE_TABLE - http://db.apache.org/derby/docs/dev/ref/rrefsyscsdiagtables.html

I haven't verified if negative values are allowed in all of these columns. If they are only
allowed to hold non-negative values, should we keep the value 19? Or should we change all
to 20 for consistency? I'm assuming that "length" in these tables refers to the display size
of the columns.

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