fix GetParentPosts() query

store/sql_post_store.go

@@ -343,9 +343,9 @@ func (s SqlPostStore) getParentsPosts(channelId string, offset int, limit int) S
 			    WHERE
 			        ChannelId = :ChannelId1
 			            AND DeleteAt = 0
-				    AND RootId <> ''
 			    ORDER BY CreateAt DESC
-			    LIMIT :Limit OFFSET :Offset) q3) q1 ON q1.RootId = q2.RootId
+			    LIMIT :Limit OFFSET :Offset) q3
+			    WHERE q3.RootId != '') q1 ON q1.RootId = q2.Id
 			WHERE
 			    ChannelId = :ChannelId2
 			        AND DeleteAt = 0