This speeds up xt/imapd-validate.t by around 10% when used with
an abandoned patch to remove ->query_xover.  We may also depend
on this further if we abandon storing doc_data in Xapian to save
disk space.
---
 lib/PublicInbox/Over.pm | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/PublicInbox/Over.pm b/lib/PublicInbox/Over.pm
index 402cbf7ce07..1faeff418f4 100644
--- a/lib/PublicInbox/Over.pm
+++ b/lib/PublicInbox/Over.pm
@@ -179,11 +179,12 @@ SELECT COUNT(num) FROM over WHERE num > 0
 sub get_art {
        my ($self, $num) = @_;
        my $dbh = $self->connect;
-       my $smsg = $dbh->selectrow_hashref(<<'', undef, $num);
+       my $sth = $dbh->prepare_cached(<<'', undef, 1);
 SELECT num,ds,ts,ddd FROM over WHERE num = ? LIMIT 1
 
-       return load_from_row($smsg) if $smsg;
-       undef;
+       $sth->execute($num);
+       my $smsg = $sth->fetchrow_hashref;
+       $smsg ? load_from_row($smsg) : undef;
 }
 
 sub next_by_mid {
--
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