David Bremner <da...@tethera.net> writes:
> + if (str.size () == 0)
> + return Xapian::Query(Xapian::Query::OP_AND_NOT,
> + Xapian::Query::MatchAll,
> + Xapian::Query (Xapian::Query::OP_WILDCARD,
> term_prefix));
> +
Full disclosure, this is a pretty expensive query. On an older i7, it
takes about 7.5s (elapsed) on my 466k messages to find 702 messages
without a subject. I don't think it's a big deal, since I don't think
notmuch search 'subject:""'
is likely to be typed by mistake.
For comparison, "grep -R '^Subject:$'" (which is not exactly the same
query, since some messages completely lack a Subject: line).
takes about 390s (elapsed).
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