It doesn't matter when $wgCommentTableSchemaMigrationStage is
MIGRATION_OLD, but it'll fail when we start changing that to later
migration stages.
Follows up I3447a412.
Change-Id: I6c010cefedd99324080ec078b83159d12709c1b1
$this->extraDataLoaded = true;
$this->description = CommentStore::newKey( "{$prefix}description" )
- ->getComment( $row )->text;
+ // $row is probably using getFields() from self::getCacheFields()
+ ->getCommentLegacy( wfGetDB( DB_REPLICA ), $row )->text;
$array = $this->decodeRow( $row, $prefix );