QUERY PLAN
Sort (cost=172.32..172.87 rows=220 width=44)
Sort Key: pinyin_shortcut, created_at DESC
-> Seq Scan on tbl_contacts (cost=0.00..163.76 rows=220 width=44)
Filter: (((name)::text ~~* '%r%'::text) OR (pinyin_shortcut ~~* '%r%'::text))