diff options
Diffstat (limited to 'storage/myisam')
| -rw-r--r-- | storage/myisam/ft_boolean_search.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/storage/myisam/ft_boolean_search.c b/storage/myisam/ft_boolean_search.c index 5c421d3688b..c881f7a7480 100644 --- a/storage/myisam/ft_boolean_search.c +++ b/storage/myisam/ft_boolean_search.c @@ -23,6 +23,12 @@ inside plus subtree. max_docid could be used by any word in plus subtree, but it could be updated by plus-word only. + Fulltext "smarter index merge" optimization assumes that rows + it gets are ordered by doc_id. That is not the case when we + search for a word with truncation operator. It may return + rows in random order. Thus we may not use "smarter index merge" + optimization with "trunc-words". + The idea is: there is no need to search for docid smaller than biggest docid inside current plus subtree or any upper plus subtree. @@ -443,7 +449,7 @@ static int _ft2_search(FTB *ftb, FTB_WORD *ftbw, my_bool init_search) memcpy(lastkey_buf+off, info->lastkey, info->lastkey_length); } ftbw->docid[0]=info->lastpos; - if (ftbw->flags & FTB_FLAG_YES) + if (ftbw->flags & FTB_FLAG_YES && !(ftbw->flags & FTB_FLAG_TRUNC)) ftbw->max_docid_expr->max_docid= info->lastpos; return 0; } @@ -488,7 +494,7 @@ static void _ftb_init_index_search(FT_INFO *ftb) { if (ftbe->flags & FTB_FLAG_NO || /* 2 */ ftbe->up->ythresh - ftbe->up->yweaks > - test(ftbe->flags & FTB_FLAG_YES)) /* 1 */ + (uint) test(ftbe->flags & FTB_FLAG_YES)) /* 1 */ { FTB_EXPR *top_ftbe=ftbe->up; ftbw->docid[0]=HA_OFFSET_ERROR; |