Context Type Search returning wrong results with "ME" in the SEARCH

Question

CREATE TABLE "TEST"
id NUMBER(19) NOT NULL,
"TESTDATA" CLOB NOT NULL ENABLE
CREATE INDEX IX_testdata ON test (testdata) INDEXTYPE IS CTXSYS.CONTEXT ONLINE
PARAMETERS ('TRANSACTIONAL MEMORY 500M SYNC(ON COMMIT) section group ctxsys.xmlpathgroup')
PARALLEL 4
insert into test values (1, '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<user>
<givenname>victor</fn>
<surname>frandenstein</sn>
</user>
select * from TEST
where
contains(testdata,
'me inpath(/user/givenname) &(victor inpath(/user/givenname))') > 0
This should not result in any results but it does show the record out.
What is it we have to do deal with the word "ME". It works fine for any other values.

Answer 1

Since "me" is a default stopword, searching for "me" and "Victor" is like just searching for "Victor", so it returns the row with "Victor" in it. If you want to be able to search for "me", then you need to either remove "me" from your existing ctxsys.default_stoplist using ctx_ddl.remove_stopword or specify another stoplist during index creation that does not contain me or an empty stoplist. You will need to drop and recreate your index after changing or modifying stoplists in order for the changes to take effect. Please see the demonstration below. I have added a couple of rows so that it is clearer what is and is not returned. You can check the token_text column of your dr$...$i index to see what it is tokenized, indexed, and searchable.
SCOTT@10gXE> -- test environment:
SCOTT@10gXE> CREATE TABLE "TEST"
  2  (
  3  id NUMBER(19) NOT NULL,
  4  "TESTDATA" CLOB NOT NULL ENABLE
  5  )
  6  /
Table created.
SCOTT@10gXE> insert into test values (1, '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  2  <user>
  3  <givenname>victor</fn>
  4  <surname>frandenstein</sn>
  5  </user>
  6  ')
  7  /
1 row created.
SCOTT@10gXE> insert into test values (2, '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  2  <user>
  3  <givenname>me victor</fn>
  4  <surname>frandenstein</sn>
  5  </user>
  6  ')
  7  /
1 row created.
SCOTT@10gXE> insert into test values (3, '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  2  <user>
  3  <givenname>naren</fn>
  4  <surname>frandenstein</sn>
  5  </user>
  6  ')
  7  /
1 row created.
SCOTT@10gXE> exec ctx_ddl.create_section_group ('xmlpathgroup', 'PATH_SECTION_GROUP')
PL/SQL procedure successfully completed.
SCOTT@10gXE> -- reproduction:
SCOTT@10gXE> CREATE INDEX IX_testdata ON test (testdata) INDEXTYPE IS CTXSYS.CONTEXT
  2  PARAMETERS
  3    ('TRANSACTIONAL MEMORY 500M
  4        SYNC(ON COMMIT)
  5        section group xmlpathgroup')
  6  PARALLEL 4
  7  /
Index created.
SCOTT@10gXE> SELECT token_text FROM dr$ix_testdata$i
  2  /
TOKEN_TEXT
FRANDENSTEIN
NAREN
VICTOR
givenname
surname
user
6 rows selected.
SCOTT@10gXE> select * from TEST
  2  where
  3  contains(testdata,
  4  'me inpath(/user/givenname) &(victor inpath(/user/givenname))') > 0
  5  /
        ID
TESTDATA
         1
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<user>
<givenname>victor</fn>
<surname>frandenstein</sn>
</user>
         2
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<user>
<givenname>me victor</fn>
<surname>frandenstein</sn>
</user>
SCOTT@10gXE> -- solution:
SCOTT@10gXE> drop index ix_testdata
  2  /
Index dropped.
SCOTT@10gXE> CREATE INDEX IX_testdata ON test (testdata) INDEXTYPE IS CTXSYS.CONTEXT
  2  PARAMETERS
  3    ('TRANSACTIONAL MEMORY 500M
  4        SYNC(ON COMMIT)
  5        section group xmlpathgroup
  6        stoplist ctxsys.empty_stoplist')
  7  PARALLEL 4
  8  /
Index created.
SCOTT@10gXE> SELECT token_text FROM dr$ix_testdata$i
  2  /
TOKEN_TEXT
FRANDENSTEIN
ME
NAREN
VICTOR
givenname
surname
user
7 rows selected.
SCOTT@10gXE> select * from TEST
  2  where
  3  contains(testdata,
  4  'me inpath(/user/givenname) &(victor inpath(/user/givenname))') > 0
  5  /
        ID
TESTDATA
         2
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<user>
<givenname>me victor</fn>
<surname>frandenstein</sn>
</user>
SCOTT@10gXE>