From ba59fac7080f7dac0e722fcef5f73093fbaf6474 Mon Sep 17 00:00:00 2001
From: Andrew Nacin <wp@andrewnacin.com>
Date: Wed, 9 Jul 2014 18:16:15 +0000
Subject: [PATCH] WP_Comment_Query: Add fields => 'ids' query var.

props mordauk.
fixes #28434.

Built from https://develop.svn.wordpress.org/trunk@29045


git-svn-id: http://core.svn.wordpress.org/trunk@28833 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/comment.php | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/wp-includes/comment.php b/wp-includes/comment.php
index dd45821c34..33a6121fd2 100644
--- a/wp-includes/comment.php
+++ b/wp-includes/comment.php
@@ -245,6 +245,7 @@ class WP_Comment_Query {
 
 		$defaults = array(
 			'author_email' => '',
+			'fields' => '',
 			'ID' => '',
 			'karma' => '',
 			'number' => '',
@@ -368,8 +369,16 @@ class WP_Comment_Query {
 		if ( $this->query_vars['count'] ) {
 			$fields = 'COUNT(*)';
 		} else {
-			$fields = '*';
+			switch ( strtolower( $this->query_vars['fields'] ) ) {
+				case 'ids':
+					$fields = "$wpdb->comments.comment_ID";
+					break;
+				default:
+					$fields = "*";
+					break;
+			}
 		}
+
 		$join = '';
 		$where = $approved;
 
@@ -460,6 +469,12 @@ class WP_Comment_Query {
 		if ( $this->query_vars['count'] ) {
 			return $wpdb->get_var( $query );
 		}
+
+		if ( 'ids' == $this->query_vars['fields'] ) {
+			$this->comments = $wpdb->get_col( $query );
+			return array_map( 'intval', $this->comments );
+		}
+
 		$results = $wpdb->get_results( $query );
 		/**
 		 * Filter the comment query results.