You are right, my negligence. I'm trying to optimize the latter query: # SELECT id, (kvp->'a') FROM mytable WHERE kvp ? 'a'; ...or something like this (which also involves the '->' operator) # SELECT id FROM mytable WHERE (kvp->'a') = 'x'; -S. 2010/3/29 Sergey Konoplev <gray.ru@xxxxxxxxx>: >> My question is, if one can get also index support for the '->' operator? > > I am not sure what do you mean. > >>>> SELECT id, (kvp->'a') FROM mytable; >>>> >>>> ... can be accelerated nevertheless by adding following where clause: >>>> >>>> SELECT id, (kvp->'a') FROM mytable WHERE kvp ? 'a'; >>>> >>>> => Is this correct? > > These queries could return completely different result sets. First > query returns all the records with the value of kvp->'a' if kvp has > 'a' key and NULL otherwise. Second one returns only those records > where kvp has 'a' key. > > -- > Sergey Konoplev > > Blog: http://gray-hemp.blogspot.com / > Linkedin: http://ru.linkedin.com/in/grayhemp / > JID/GTalk: gray.ru@xxxxxxxxx / Skype: gray-hemp / ICQ: 29353802 > -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
