On 22 September 2014 14:46, Heikki Linnakangas <hlinnakan...@vmware.com> wrote: > On 09/22/2014 04:45 PM, Tom Lane wrote: >> >> Heikki Linnakangas <hlinnakan...@vmware.com> writes: >>> >>> On 09/22/2014 07:47 AM, Rajeev rastogi wrote: >>>> >>>> So my proposal is to skip the condition check on the first scan key >>>> condition for every tuple. >> >> >>> The same happens in a single-column case. If you have a query like >>> "SELECT * FROM tbl2 where id2 > 'a'", once you've found the start >>> position of the scan, you know that all the rows that follow match too. >> >> >> ... unless you're doing a backwards scan. > > > Sure. And you have to still check for NULLs. Have to get the details right..
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And also that the tests don't use volatile functions. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
