[Xapian-discuss] Phrase Query vs AND Query? Why don't these find the same things?

[jarrod roberson]

PHRASE QUERY
Xapian::Query((MBOX:12345678-1234-1234-1234-1234567890ab AND
(LP:backup:(pos=1) PHRASE 6 LP:c::(pos=2) PHRASE 6 LP:program files:(pos=3)
PHRASE 6 LP:Mozilla Firefox:(pos=4) PHRASE 6 LP:res:(pos=5) PHRASE 6 LP:
table-add-column-after-hover.gif:(pos=6))))

AND QUERY
Xapian::Query((MBOX:12345678-1234-1234-1234-1234567890ab AND
LP:backup:(pos=1) AND LP:c::(pos=2) AND LP:program files:(pos=3) AND
LP:Mozilla Firefox:(pos=4) AND LP:res:(pos=5) AND LP:
table-add-column-after-hover.gif:(pos=6)))

given that I have done .add_posting() correctly with the LP: prefixed terms
and the second AND Query returns the set of data I expect, why does the
first query NOT return ANYTHING?

here is what DELVE tells me

>delve -r 1 -1 -d -v -k /index/wfs/
Values for record #1:
1:/backup/c:/program files/Mozilla Firefox/res/table-
add-column-after-hover.gif
Data for record #1:
/wfs/0/+/D/0+DM0wZ6y_mHubbNJjQXrgqW64s=/table-add-column-after-hover.gif
/12345678-1234-1234-1234-1234567890ab
Term List for record #1:
CDATE:1135755971 1 1
ETAG:DA39A3EE5E6B4B0D3255BFEF95601890AFD80709 1 1
LANG:en 1 1
LEN:0 1 1
LP:Mozilla Firefox 1 1
LP:backup 1 1
LP:c: 1 1
LP:program files 1 1
LP:res 1 1
LP:table-add-column-after-hover.gif 1 1
MBOX:12345678-1234-1234-1234-1234567890ab 1 1
MDATE:1135755971 1 1
MIME:application/octet-stream 1 1
NAME:table-add-column-after-hover.gif 1 1
TYPE:0 1 1

here is what my test program outputs with the AND QUERY
the numbers in the [] after the LP: prefixed terms are thier posting
postiions

found 1
DOCID:1
PPATH:/wfs/0/+/D/0+DM0wZ6y_mHubbNJjQXrgqW64s=/table-
add-column-after-hover.gif/12345678-1234-1234-1234-1234567890ab
LPATH:/backup/c:/program files/Mozilla Firefox/res/table-
add-column-after-hover.gif
CDATE:1135755971 (Wed, 28 Dec 2005 07:46:11 GMT)
ETAG:DA39A3EE5E6B4B0D3255BFEF95601890AFD80709
LANG:en
LEN:0
LP:Mozilla Firefox [4]
LP:backup [1]
LP:c: [2]
LP:program files [3]
LP:res [5]
LP:table-add-column-after-hover.gif [6]
MBOX:12345678-1234-1234-1234-1234567890ab
MDATE:1135755971 (Wed, 28 Dec 2005 07:46:11 GMT)
MIME:application/octet-stream
NAME:table-add-column-after-hover.gif
TYPE:0 (file)

anyone have any ideas how to get a PHRASE QUERY to return the data?
also what will ulimate be "better" given the context of these queries, the
AND QUERY or the PHRASE QUERY?