Hi, I had a chance to go through the Hash join code of Postgresql and had the following thoughts.
- Currently postgres takes the heaptuple from the slot and creates and minimal_tuple and copies it into the temp file. I think the creation of minimal_tuple in the middle is a overhead which can be avoided by creating a mem-map and directly creating the minimal_tuple in the mem-map. Since Hash join is used mainly to join huge tables, this might benefit those warehouse customers of postgres. Am i missing something??? Thanks, Gokul.
