miscsearch: index UIDVALIDITY, use as startup cache

This brings -nntpd startup time down from ~35s to ~5s with 50K
inboxes.

Further improvements ought to be possible with deeper changes to
MiscIdx, since -mda having to load every inbox seems unreasonable;
but this general change is fairly unintrusive.

1 files changed, 0 insertions, 7 deletions

diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index cf2c2c55..d1b0c724 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -106,7 +106,6 @@ sub load_xapian_writable () {
         }
         eval 'require '.$X->{WritableDatabase} or die;
         *sortable_serialise = $xap.'::sortable_serialise';
-        *sortable_unserialise = $xap.'::sortable_unserialise';
         $DB_CREATE_OR_OPEN = eval($xap.'::DB_CREATE_OR_OPEN()');
         $DB_OPEN = eval($xap.'::DB_OPEN()');
         my $ver = (eval($xap.'::major_version()') << 16) |
@@ -501,12 +500,6 @@ sub remove_eidx_info {
         $self->{xdb}->replace_document($docid, $doc);
 }
 
-sub int_val ($$) {
-        my ($doc, $col) = @_;
-        my $val = $doc->get_value($col) or return; # undefined is '' in Xapian
-        sortable_unserialise($val) + 0; # PV => IV conversion
-}
-
 sub smsg_from_doc ($) {
         my ($doc) = @_;
         my $data = $doc->get_data or return;