1 files changed, 8 insertions, 0 deletions
diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index f0e7ed0c..d89bf545 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -570,4 +570,12 @@ sub xap_terms ($$;@) {
          wantarray ? sort(keys(%ret)) : \%ret;
  }
  
+# get combined docid from over.num:
+# (not generic Xapian, only works with our sharding scheme)
+sub num2docid ($$) {
+        my ($self, $num) = @_;
+        my $nshard = $self->{nshard};
+        ($num - 1) * $nshard + $num % $nshard + 1;
+}
+
  1;