Why Does Stem Search of Alphanumeric Token Return No Rows with INDEX_STEMS=ENGLISH?
(Doc ID 1419116.1)
Last updated on FEBRUARY 28, 2012
Applies to:
Oracle Text - Version: 9.2.0.1 to 11.2.0.3 - Release: 9.2 to 11.2Information in this document applies to any platform.
Goal
Stem search of alphanumeric token using DIRECT_DATASTORE and INDEX_STEMS=ENGLISH for lexer attribute results in no rows found.To recreate the issue:
create table foo (id integer, string varchar2(30));
insert into foo values (1,'20');
insert into foo values (2,'20th');
commit;
exec ctx_ddl.create_preference('FOO_IDX_LEX','BASIC_LEXER');
exec ctx_ddl.set_attribute('FOO_IDX_LEX','INDEX_STEMS','ENGLISH');
create index FOO_IDX
on FOO (STRING)
indextype as ctxsys.context
parameters('lexer FOO_IDX_LEX');
select * from foo where contains(string,'20')> 0;
ID STRING
-- ---------
1 20
-- STEMMING of "20th" is not returned-- WHY?
select * from foo where contains(string,'$20th')> 0;
ID STRING
-- ---------
1 20
select * from foo where contains(string,'20th')> 0;
ID STRING
-- ---------
2 20th
Why does the stemming of an alphanumeric fail to return in a contains search with INDEX_STEMS attribute set to ENGLISH?
Solution
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In this Document
Goal
Solution