view: avoid intermediate array when streaming thread

We can rely on auto-vivification to avoid an intermediate
array for the map result.

diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index fa96cca337d87f9113425a209c5b78aafa2b6dfa..26094082996678975a5830876f00c0de431d9b91 100644 (file)
--- a/lib/PublicInbox/View.pm
+++ b/lib/PublicInbox/View.pm
@@ -1,4 +1,4 @@
-# Copyright (C) 2014-2021 all contributors <meta@public-inbox.org>
+# Copyright (C) all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 #
 # Used for displaying the HTML web interface.
@@ -429,7 +429,7 @@ sub stream_thread_i { # PublicInbox::WwwStream::getline callback
 
 sub stream_thread ($$) {
        my ($rootset, $ctx) = @_;
-       $ctx->{-queue} = [ map { (0, $_) } @$rootset ];
+       @{$ctx->{-queue}} = map { (0, $_) } @$rootset;
        PublicInbox::WwwStream::aresponse($ctx, 200, \&stream_thread_i);
 }