Expression.datePart(String) not working for for Oracle??!?!

Using the following line in a expression gives an exception:
expression = expression.and(builder.get("invoice").get("date").dateName("year").equal(year));
gives..
EXCEPTION [TOPLINK-6047] (TopLink - 9.0.3 (Build 423)): oracle.toplink.exceptions.QueryException
EXCEPTION DESCRIPTION: Invalid operator [operator - platform - 92] in expression.
QUERY: ReadAllQuery(ca.gc.psc.ecs.business.InvoiceItem)
LOCAL EXCEPTION STACK:
EXCEPTION [TOPLINK-6047] (TopLink - 9.0.3 (Build 423)): oracle.toplink.exceptions.QueryException
EXCEPTION DESCRIPTION: Invalid operator [operator - platform - 92] in expression.
I am using Oracle 8i. Any idea? If datePart is not recognized by Oracle (doc states Sybase), why it is there? If so, how do I define a new ExpressionOperator, API doesn't say much on how to it.
Thanks, Joel Gregoire

DATE_NAME is a Sybase specific function this is why you are getting this error, in Oracle the to_char function can be used.
SQL Example:
TO_CHAR(b, 'YYYY')
Expression Example:
expression = expression.and(builder.get("invoice").get("date").getFunction("TO_CHAR", "YYYY").equal(year));

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    [email protected]_11gR2> select * from v$version
      2  /
    BANNER
    Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
    PL/SQL Release 11.2.0.1.0 - Production
    CORE     11.2.0.1.0     Production
    TNS for 64-bit Windows: Version 11.2.0.1.0 - Production
    NLSRTL Version 11.2.0.1.0 - Production
    5 rows selected.
    [email protected]_11gR2> select value from v$nls_parameters
      2  where  parameter = 'NLS_CHARACTERSET'
      3  /
    VALUE
    AL32UTF8
    1 row selected.
    [email protected]_11gR2> DROP TABLE news
      2  /
    Table dropped.
    [email protected]_11gR2> EXEC CTX_DDL.DROP_PREFERENCE ('my_wordlist')
    PL/SQL procedure successfully completed.
    [email protected]_11gR2> EXEC CTX_DDL.DROP_PREFERENCE ('global_lexer')
    PL/SQL procedure successfully completed.
    [email protected]_11gR2> EXEC CTX_DDL.DROP_PREFERENCE ('english_LEXER')
    PL/SQL procedure successfully completed.
    [email protected]_11gR2> EXEC CTX_DDL.DROP_PREFERENCE ('german_LEXER')
    PL/SQL procedure successfully completed.
    [email protected]_11gR2> CREATE TABLE news
      2    (pkey            NUMBER,
      3       lang            VARCHAR2 (2),
      4       short_content  CLOB)
      5  /
    Table created.
    [email protected]_11gR2> INSERT ALL
      2  INTO news (pkey, lang, short_content)
      3    VALUES  (1, 'en', 'I drive a bike.')
      4  INTO news (pkey, lang, short_content)
      5    VALUES  (2, 'en', 'I drove a bike.')
      6  INTO news (pkey, lang, short_content)
      7    VALUES  (3, 'en', 'I have driven a bike.')
      8  INTO news (pkey, lang, short_content)
      9    VALUES  (4, 'en', 'I always drive a car')
    10  INTO news (pkey, lang, short_content)
    11    VALUES  (5, 'en', 'This is nothing')
    12  INTO news (pkey, lang, short_content)
    13    VALUES  (6, 'de', 'Ich fahre ein Fahrrad.')
    14  INTO news (pkey, lang, short_content)
    15    VALUES  (7, 'de', 'Ich fuhr ein Fahrrad.')
    16  INTO news (pkey, lang, short_content)
    17    VALUES  (8, 'de', 'Ich habe ein Fahrrad gefahren.')
    18  INTO news (pkey, lang, short_content)
    19    VALUES  (9, 'de', 'Ich habe immer ein Auto fahren.')
    20  INTO news (pkey, lang, short_content)
    21    VALUES  (10, 'de', 'Es ist nichts.')
    22  SELECT * FROM DUAL
    23  /
    10 rows created.
    [email protected]_11gR2> BEGIN
      2    -- word list:
      3    ctx_ddl.create_preference ('my_wordlist',   'basic_wordlist');
      4    ctx_ddl.set_attribute      ('my_wordlist',   'stemmer',           'auto');
      5    -- english lexer:
      6    ctx_ddl.create_preference ('english_lexer', 'basic_lexer');
      7    -- german lexer:
      8    ctx_ddl.create_preference ('german_lexer',  'basic_lexer');
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    10    ctx_ddl.set_attribute      ('german_lexer',  'alternate_spelling', 'german');
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    16    ctx_ddl.add_sub_lexer      ('global_lexer',  'german',            'german_lexer');
    17  END;
    18  /
    PL/SQL procedure successfully completed.
    [email protected]_11gR2> create index search_news
      2  on news (short_content)
      3  indextype is ctxsys.context
      4  parameters
      5    ('lexer            global_lexer
      6        language column  lang
      7        wordlist       my_wordlist')
      8  /
    Index created.
    [email protected]_11gR2> EXEC DBMS_STATS.GATHER_TABLE_STATS (USER, 'NEWS')
    PL/SQL procedure successfully completed.
    [email protected]_11gR2> COLUMN short_content FORMAT A30
    [email protected]_11gR2> ALTER SESSION SET NLS_LANGUAGE = 'AMERICAN'
      2  /
    Session altered.
    [email protected]_11gR2> set timing on
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      2  where  contains (short_content, '$drive') > 0
      3  /
          PKEY LA SHORT_CONTENT
             1 en I drive a bike.
             2 en I drove a bike.
             3 en I have driven a bike.
             4 en I always drive a car
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    Elapsed: 00:00:00.05
    [email protected]_11gR2> select * from news
      2  where  contains (short_content, '$drove') > 0
      3  /
          PKEY LA SHORT_CONTENT
             1 en I drive a bike.
             2 en I drove a bike.
             3 en I have driven a bike.
             4 en I always drive a car
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    Elapsed: 00:00:00.05
    [email protected]_11gR2> ALTER SESSION SET NLS_LANGUAGE = 'GERMAN'
      2  /
    Session altered.
    Elapsed: 00:00:00.01
    [email protected]_11gR2> select * from news
      2  where  contains (short_content, '$fahr') > 0
      3  /
          PKEY LA SHORT_CONTENT
             6 de Ich fahre ein Fahrrad.
             7 de Ich fuhr ein Fahrrad.
             8 de Ich habe ein Fahrrad gefahren.
             9 de Ich habe immer ein Auto fahren
    4 rows selected.
    Elapsed: 00:00:00.07
    [email protected]_11gR2> select * from news
      2  where  contains (short_content, '$fuhr') > 0
      3  /
          PKEY LA SHORT_CONTENT
             6 de Ich fahre ein Fahrrad.
             7 de Ich fuhr ein Fahrrad.
             8 de Ich habe ein Fahrrad gefahren.
             9 de Ich habe immer ein Auto fahren
    4 rows selected.
    Elapsed: 00:00:00.16-- script for you to reproduce the demo on your system:
    select * from v$version
    select value from v$nls_parameters
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    EXEC CTX_DDL.DROP_PREFERENCE ('german_LEXER')
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       lang           VARCHAR2 (2),
       short_content  CLOB)
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      VALUES  (1, 'en', 'I drive a bike.')
    INTO news (pkey, lang, short_content)
      VALUES  (2, 'en', 'I drove a bike.')
    INTO news (pkey, lang, short_content)
      VALUES  (3, 'en', 'I have driven a bike.')
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      VALUES  (5, 'en', 'This is nothing')
    INTO news (pkey, lang, short_content)
      VALUES  (6, 'de', 'Ich fahre ein Fahrrad.')
    INTO news (pkey, lang, short_content)
      VALUES  (7, 'de', 'Ich fuhr ein Fahrrad.')
    INTO news (pkey, lang, short_content)
      VALUES  (8, 'de', 'Ich habe ein Fahrrad gefahren.')
    INTO news (pkey, lang, short_content)
      VALUES  (9, 'de', 'Ich habe immer ein Auto fahren.')
    INTO news (pkey, lang, short_content)
      VALUES  (10, 'de', 'Es ist nichts.')
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      ctx_ddl.set_attribute     ('german_lexer',  'mixed_case',          'no');
      ctx_ddl.set_attribute     ('german_lexer',  'base_letter',         'yes');
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      ctx_ddl.add_sub_lexer     ('global_lexer',  'german',              'german_lexer');
    END;
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    on news (short_content)
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    parameters
      ('lexer            global_lexer
        language column  lang
        wordlist         my_wordlist')
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    select * from news
    where  contains (short_content, '$drove') > 0
    ALTER SESSION SET NLS_LANGUAGE = 'GERMAN'
    select * from news
    where  contains (short_content, '$fahr') > 0
    select * from news
    where  contains (short_content, '$fuhr') > 0
    /

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