wiki_site=> select page_title, lower(page_title) from page where page_id =  43 ;
 page_title | lower
------------+-------
 Планы      |
( 1  row)

wiki_site=> select page_title, upper(page_title) from page where page_id =  43 ;
 page_title | upper
------------+-------
 Планы      | Планы
( 1  row)

wiki_site=> select page_title, to_tsvector(page_title) from page where page_id =  43 ;
 page_title | to_tsvector
------------+-------------
 Планы      | '\x01
( 1  row)