store less data in the Xapian document

Since we only query the SQLite over DB for OVER/XOVER; do not
need to waste space storing fields To/Cc/:bytes/:lines or the
XNUM term.  We only use From/Subject/References/Message-ID/:blob
in various places of the PSGI code.

For reindexing, we will take advantage of docid stability
in "xapian-compact --no-renumber" to ensure duplicates do not
show up in search results.  Since the PSGI interface is the
only consumer of Xapian at the moment, it has no need to
search based on NNTP article number.

1 files changed, 2 insertions, 4 deletions

diff --git a/lib/PublicInbox/SearchMsg.pm b/lib/PublicInbox/SearchMsg.pm
index 3278802b..ab971e00 100644
--- a/lib/PublicInbox/SearchMsg.pm
+++ b/lib/PublicInbox/SearchMsg.pm
@@ -45,12 +45,11 @@ sub to_doc_data {
                 $self->cc,
                 $oid,
                 $mid0,
-                $self->{bytes},
-                $self->{lines}
+                $self->{bytes} || '',
+                $self->{lines} || ''
         );
 }
 
-
 sub load_from_data ($$) {
         my ($self) = $_[0]; # data = $_[1]
         (
@@ -92,7 +91,6 @@ sub load_doc {
 # :bytes and :lines metadata in RFC 3977
 sub bytes ($) { $_[0]->{bytes} }
 sub lines ($) { $_[0]->{lines} }
-sub num ($) { $_[0]->{num} ||= _get_term_val($_[0], 'XNUM', qr/\AXNUM/) }
 
 sub __hdr ($$) {
         my ($self, $field) = @_;