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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2967) Single character does not match high value unicode character with collation TERRITORY_BASED
Date Tue, 09 Oct 2007 04:48:50 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12533263
] 

Mamta A. Satoor commented on DERBY-2967:
----------------------------------------

Bernt, I tend to disagree with 'aa'='å' is false statement based on my understanding of SQL
spec Section 8.2 <comparison predicate> General Rules 3c) and 3d). 
3c) The result of the comparison of X and Y is given by the collation CS.
3d) Depending on the collation, two strings may compare as equal even if they are of different
lengths or contain different sequences of characters.

Based on these 2 rules, if the collation CS for Norwegian compares 'aa' and 'å' as true,
then the result of 'aa'='å' will be true. In other words, if the collation elements for 'aa'
matches 'å', then it means that collation CS compares them equal.

I can see how a person with name "Håkon" may not write his name "Haakon" or vice versa but
I think if my interpretation of SQL spec is right, then SQL is going to treat "Håkon"="Haakon"
depending on the collation CS. Do let me know if my understanding of SQL spec in this area
is incorrect.

> Single character does not match high value unicode character with collation TERRITORY_BASED
> -------------------------------------------------------------------------------------------
>
>                 Key: DERBY-2967
>                 URL: https://issues.apache.org/jira/browse/DERBY-2967
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.4.0.0
>            Reporter: Kathey Marsden
>            Assignee: Mamta A. Satoor
>         Attachments: DERBY2967_offset_based_diff_Oct02_07.txt, DERBY2967_offset_based_stat_Oct02_07.txt,
fullcoll.out, patch2_setOffset_fullcoll.out, patch2_with_setOffset_diff_Sep2007.txt, patch2_with_setOffset_stat_Sep2007.txt,
step1_iteratorbased_Sep1507_diff.txt, step1_iteratorbased_Sep1507_stat.txt, temp_diff.txt,
temp_stat.txt, TestFrench.java, TestNorway.java
>
>
> With TERRITORY_BASED collation '_' does not match  the character \uFA2D.  It is the same
for english or norwegian. FOR collation UCS_BASIC it matches fine.  Could you tell me if this
is a bug?
> Here is a program to reproduce.
> import java.sql.*;
> public class HighCharacter {
>    public static void main(String args[]) throws Exception
>    {
>    System.out.println("\n Territory no_NO");
>    Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
>    Connection conn = DriverManager.getConnection("jdbc:derby:nordb;create=true;territory=no_NO;collation=TERRITORY_BASED");
>    testLikeWithHighestValidCharacter(conn);
>    conn.close();
>    System.out.println("\n Territory en_US");
>    conn = DriverManager.getConnection("jdbc:derby:endb;create=true;territory=en_US;collation=TERRITORY_BASED");
>    testLikeWithHighestValidCharacter(conn);
>    conn.close();
>    System.out.println("\n Collation USC_BASIC");
>    conn = DriverManager.getConnection("jdbc:derby:basicdb;create=true");
>    testLikeWithHighestValidCharacter(conn);
>    }
> public static  void testLikeWithHighestValidCharacter(Connection conn) throws SQLException
{
>    Statement stmt = conn.createStatement();
>    try {
>    stmt.executeUpdate("drop table t1");
>    }catch (SQLException se)
>    {// drop failure ok.
>    }
>    stmt.executeUpdate("create table t1(c11 int)");
>    stmt.executeUpdate("insert into t1 values 1");
>  
>    // \uFA2D - the highest valid character according to
>    // Character.isDefined() of JDK 1.4;
>    PreparedStatement ps =
>    conn.prepareStatement("select 1 from t1 where '\uFA2D' like ?");
>      String[] match = { "%", "_", "\uFA2D" };
>    for (int i = 0; i < match.length; i++) {
>    System.out.println("select 1 from t1 where '\\uFA2D' like " + match[i]);
>    ps.setString(1, match[i]);
>    ResultSet rs = ps.executeQuery();
>    if( rs.next() && rs.getString(1).equals("1"))
>        System.out.println("PASS");
>    else          System.out.println("FAIL: no match");
>    rs.close();
>    }
>   }
> }
> Mamta made some comments on this issue in the following thread:
> http://www.nabble.com/Single-character-does-not-match-high-value-unicode-character-with-collation-TERRITORY_BASED.-Is-this-a-bug-tf4118767.html

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