[
http://issues.apache.org/jira/browse/DERBY-2002?page=comments#action_12445453 ]
Christian d'Heureuse commented on DERBY-2002:
---------------------------------------------
> The CASE expression is a conforming SQL language described in the SQL:2003
> spec.
> So the implementation is trying to process a conforming SQL language in a
> nonconforming
> manner, ...
I even don't agree with that.
A CASE statement with all NULL values violates syntax rule 3.
Therefore the expression
case when 1=2 then NULL when 1=3 then NULL else NULL end;
is syntactically not conforming, because it breaks a syntax rule.
Therefore this CASE expression is non-conforming SQL.
> 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
> 6.11 <case expression> Format section defines <result> as the following:
> <result> ::=
> <result expression>
> | NULL
> 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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