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From "Christian d'Heureuse (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2002) Case expression allows NULL in all parts of <result>
Date Sat, 28 Oct 2006 22:08:17 GMT
    [ http://issues.apache.org/jira/browse/DERBY-2002?page=comments#action_12445412 ] 
            
Christian d'Heureuse commented on DERBY-2002:
---------------------------------------------

ISO/IEC 9075-1 6.3.3.2 states:
"In the Syntax Rules, the term shall defines conditions that are required to be true of syntactically
conforming
SQL language. ... The treatment of language that does not conform to the SQL Formats and Syntax
Rules is implementation-dependent. ..."

As I understand that, an implementation is free to accept non-conforming SQL syntax. So there
is no need to generate an SQLException when that syntax rule is violated because all <result>s
are NULL.in the CASE expression.

> Case expression allows NULL in all parts of <result>
> ----------------------------------------------------
>
>                 Key: DERBY-2002
>                 URL: http://issues.apache.org/jira/browse/DERBY-2002
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.2.1.6, 10.3.0.0
>         Environment: Any
>            Reporter: Yip Ng
>
> According to the SQL:2003 spec, section 6.11 <case expression> Syntax Rule 3. 
At least one <result> in a 
> <case specification> shall specify a <result expression>.  Derby currently
is violating this rule.  e.g.:
> ij> values case when 1=2 then NULL when 1=3 then NULL else NULL end;
> 1
> ----
> NULL
> 1 row selected
> The above statement should have thrown a SQLException instead of returning a result.
> sysinfo:
> ------------------ Java Information ------------------
> Java Version:    1.4.2_12
> Java Vendor:     Sun Microsystems Inc.
> Java home:       C:\jdk142\jre
> Java classpath:  classes;.
> OS name:         Windows XP
> OS architecture: x86
> OS version:      5.1
> Java user name:  yip
> Java user home:  C:\Documents and Settings\Administrator
> Java user dir:   C:\derby\trunk
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.4
> --------- Derby Information --------
> JRE - JDBC: J2SE 1.4.2 - JDBC 3.0
> [C:\derby\trunk\classes] 10.3.0.0 alpha - (1)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> Current Locale :  [English/United States [en_US]]
> Found support for locale: [de_DE]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [es]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [fr]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [it]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [ja_JP]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [ko_KR]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [pt_BR]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [zh_CN]
>          version: 10.3.0.0 alpha - (1)
> Found support for locale: [zh_TW]
>          version: 10.3.0.0 alpha - (1)
> ------------------------------------------------------

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