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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-910) RunTimeStatistics shows system generated backing index name rather than the constraint name when optimizer overrides is used for constraint
Date Tue, 21 Jul 2009 15:25:14 GMT

     [ https://issues.apache.org/jira/browse/DERBY-910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rick Hillegas updated DERBY-910:
--------------------------------

    Issue & fix info: [Repro attached]
             Urgency: Normal

Triaged for 10.5.3: assigned normal urgency and noted that a repro is attached.

> RunTimeStatistics shows system generated backing index name rather than the constraint
name when optimizer overrides is used for constraint
> -------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-910
>                 URL: https://issues.apache.org/jira/browse/DERBY-910
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.2.1.6
>            Reporter: Mamta A. Satoor
>            Priority: Minor
>
> When user specifies a constraint name in optimizer overrides for a query, the runtime
statistics info on that query  shows the backing index name rather than the constraint name.
eg
> create table prim ( i int not null primary key, j int);
>  create table sec (i int, constraint fk foreign key(i) references prim(i), j int);
>  select * from sec --derby-properties constraint=fk
>  ;
>        ...........................................
>        optimizer estimated cost:          136.34
>        User supplied optimizer overrides on SEC are { index=SQL060131012414010}   <=========
>        Index Scan ResultSet for SEC using constraint FK at read committed isolation level
using instantaneous share row locking chosen by the optimizer
>        Number of opens = 1

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