I noticed the following code in tsearch2: typedef uint64 TPQTGist;
static TPQTGist makesign(QUERYTYPE * a) { int i; ITEM *ptr = GETQUERY(a); TPQTGist sign = 0; for (i = 0; i < a->size; i++) { if (ptr->type == VAL) sign |= 1 << (ptr->val % SIGLEN); ptr++; } return sign; } This is wrong because "1" is an int constant, not an int64, and therefore the shift will be done in int width. Correct would be sign |= ((TPQTGist) 1) << (ptr->val % SIGLEN); The effect of this is at least that the high-order half of sign remains always zero. Depending on what the machine does with shifts exceeding the word width (which is undefined according to ANSI C), the bottom half might be messed up too. So we are failing to exploit the full intended "sign" space, which presumably is costing something in index efficiency. It looks to me like the values calculated by this routine end up on disk, and therefore we can't fix it without forcing an initdb, or at least REINDEX of all affected indexes. Is that correct? regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly