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From: David Bremner <david@tethera.net>
To: xapian-discuss@lists.xapian.org
Cc: notmuch@notmuchmail.org
Subject: xapian parser bug?
Date: Sat, 29 Sep 2018 19:09:01 -0300
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Today we noticed that keywords can't be searched as prefixed terms. Or
that's what it looks like anyway. I tested and, or, and not.

=E2=95=B0=E2=94=80% NOTMUCH_DEBUG_QUERY=3Dy notmuch search 'subject:"and"'
Query string is:
subject:"and"
notmuch search: A Xapian exception occurred
A Xapian exception occurred parsing query: Syntax: <expression> AND <expres=
sion>
Query string was: subject:"and"

=E2=95=B0=E2=94=80% NOTMUCH_DEBUG_QUERY=3Dy notmuch search 'subject:"or"'=20
Query string is:
subject:"or"
notmuch search: A Xapian exception occurred
A Xapian exception occurred parsing query: Syntax: <expression> OR <express=
ion>
Query string was: subject:"or"

=E2=95=B0=E2=94=80% NOTMUCH_DEBUG_QUERY=3Dy notmuch search 'subject:"not"'
Query string is:
subject:"not"
notmuch search: A Xapian exception occurred
A Xapian exception occurred parsing query: Syntax: <expression> NOT <expres=
sion>
Query string was: subject:"not"

Interestingly, putting space around the operator seems to be a
workaround. Something about turning on phrase parsing maybe?

=E2=95=B0=E2=94=80% NOTMUCH_DEBUG_QUERY=3Dy notmuch count 'subject:" not "'
Query string is:
subject:" not "
Exclude query is:
Query((((Kspam OR Kdeleted) OR Kmuted) OR Kbad-address))
Final query is:
Query(((Tmail AND 0 * XSUBJECTnot@1) AND_NOT (((Kspam OR Kdeleted) OR Kmute=
d) OR Kbad-address)))
9927