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https://issues.apache.org/jira/browse/DERBY-5276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13059668#comment-13059668
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Jayaram Subramanian commented on DERBY-5276:
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Hi Knut
I would like to take up this reference manual updation. Please let me know on
how to proceed.
> Reference manual has wrong length for BIGINT columns in system tables
> ---------------------------------------------------------------------
>
> 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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