---------- Forwarded message ---------- From: Fx <[EMAIL PROTECTED]> Date: Mon, 20 Sep 2004 14:32:09 -0300 Subject: How to change/replace an in-memory palloced tuple- tuple data To: [EMAIL PROTECTED]
Hi there , i have this scenario : - postgresql 7.5 ( with modified heap_* functions to retrieve data from another dbms) - the tuple's data is allocated in memory via palloc (the tuple table slot and the heap tuple hold a pointer to the data and not to the buffer pages nor hard disk data pointers) - the changes (by now) gonna be implemented in sequential scans. Having these , I need to modify the tuple after the ExecQual , and after the projection so i can save memory , just changing the tuple to hold a "hash" or compressed data , and decompress / or restore the tuple data in the ExecSelect phase. I tried to do this using the heap_modifytuple function , and returning a "newSlot with a newTuple" instead the "resultSlot" but as i suppose im missing something , can anyone help me ? or give me a clue.... Thanks in advance.. Weimi.. -- /* Jumping Flowers */ -- /* Jumping Flowers */ ---------------------------(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