Comments: Introduce `wp_update_comment_type_batch_size` filter for the comment batch size in `_wp_batch_update_comment_type()`.

Follow-up to [47597].

Props dchymko.
Fixes #50513. See #49236.
Built from https://develop.svn.wordpress.org/trunk@48225


git-svn-id: http://core.svn.wordpress.org/trunk@47994 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/comment.php

@@ -3831,13 +3831,25 @@ function _wp_batch_update_comment_type() {
 	// Empty comment type found? We'll need to run this script again.
 	wp_schedule_single_event( time() + ( 2 * MINUTE_IN_SECONDS ), 'wp_update_comment_type_batch' );
 
-	// Update the `comment_type` field value to be `comment` for the next 100 rows of comments.
+	/**
+	 * Filters the comment batch size for updating the comment type.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @param int $comment_batch_size The comment batch size. Default 100.
+	 */
+	$comment_batch_size = (int) apply_filters( 'wp_update_comment_type_batch_size', 100 );
+
+	// Update the `comment_type` field value to be `comment` for the next batch of comments.
 	$wpdb->query(
+		$wpdb->prepare(
 			"UPDATE {$wpdb->comments}
 			SET comment_type = 'comment'
 			WHERE comment_type = ''
 			ORDER BY comment_ID DESC
-		LIMIT 100"
+			LIMIT %d"
+		),
+		$comment_batch_size
 	);
 
 	delete_option( $lock_name );

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-48224';
+$wp_version = '5.5-alpha-48225';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.