The model stop classes Miss words in combination with spelling
Hello
I tried the reasons stopclass of Oracle 12 c (12.1.0.1.0 on Windows) to the stoplist filtering based on regular expressions. It seems that corresponding words expressions are not detected as empty words when the base lexer for German spelling is active:
Assume that the text below (meansing ' height 100 m "):
'Hoehe 100 m'
Define a class to stop for distance such as 100 m stations "via:"
ctx_ddl.add_stopclass ('mystoplist', 'class_1', ' [0-9] + m "")
So I expect to be able to find the documents containing the text above, when I search with CONTAINS (' mycolumn, ' Hoehe ") but not through CONTAINS(mycolumn, '100m') because this term is blocked by the class of the judgment.
Normally, this works as expected UNLESS you put on other spelling ctx_ddl.set_attribute ('my_lex', 'alternate_spelling', 'GERMAN'). As soon as the text to be indexed contains a token with a combination of characters
for which there is an alternative spelling, empty words are detected suddenly no more. In the example above, the alternative for 'Hoehe' would be 'Höhe' (H & ouml; it) and now I find the document via CONTAINS (mycolumn, 100 me).
Is this a bug or am I missing something?
Thank you
Stefan
Complete code for re-production:
Set serveroutput on;
create the table mytable)
TextCol varchar2 (200)
);
insert into mytable values ('Hoehe 100 m'); -NOK which produces the problem due to the combination of o-e
insert into mytable values (' height 200 m '); -Do OK no problem with that
insert into mytable values ('Hohe 300 m'); -OK
Start
() ctx_ddl.create_stoplist
stoplist_name = > 'mystoplist.
);
ctx_ddl.add_stopclass ('mystoplist', 'class_1', ' [0-9] + m "");
end;
/
Start
-Override Default Lexer German
ctx_ddl.create_preference ('my_lex', 'BASIC_LEXER');
-If you remove the attribute below, it will solve the problem:
ctx_ddl.set_attribute ('my_lex', 'alternate_spelling', 'GERMAN');
end;
/
create index myindex on mytable (textcol)
indexType is ctxsys.context
parameters ("list of words EMPTY mystoplist
LEXER my_lex');
-The following query returns "Hoehe" 100 m. But it shouldn't because "100 m" is a stopword.
-Note other tokens corresponding to the class of stop (200 m, 300 m) are indeed not find as it should.
-So this problem should be linked to the function of the alternative spelling.
Select * from mytable where contains (textcol, 100 m: 200 m: 300 m "") > 0;
-The following query returns "100 m". We expect no success here is a stopword according to
-at the stop set the class and stop words should not be in the index.
Select token_text from dr$ myindex$ I where token_text = '100 M '; -standardize uppercase!
This is a bug. Please do a SR with Oracle's Support to get connected. Or, if you wish, I can connect it as a bug in-house, but this way, it won't be as easy for you to follow.
Comment on your testcase - it is generally very good (Bravo!), but you can't add comments after the semicolon at the end of the SQL statements and expect it to work in SQL * more. I imagine that you created the script and then added comments later - just another example of why it is important to cut-and - paste exactly what you have run!
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