E.g., I have a statement like this in PL/PgSQL:
UPDATE mytable SET mybigintcol = somevalue WHERE mybigintcol = NEW.myotherbigintcol;
This shows up in the logs with the NEW variable converted to unquoted constant data. Is PL/PgSQL smart enough to help the planner figure out that it can use an index on mybigintcol based on the fact that the type of myotherbigintcol can be discerned from the record of NEW? Or is type information not available as the record variable is interpolated and passed to the planner?
As in, should I rewrite the above statement as:
UPDATE mytable SET mybigintcol = somevalue WHERE mybigintcol = '''''' || NEW.myotherbigintcol || '''''';
in order to help the planner understand that it can use an index?
-tfo
-- Thomas F. O'Connell Co-Founder, Information Architect Sitening, LLC http://www.sitening.com/ 110 30th Avenue North, Suite 6 Nashville, TN 37203-6320 615-260-0005
---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
