diff options
Diffstat (limited to 'storage/myisam/ft_boolean_search.c')
| -rw-r--r-- | storage/myisam/ft_boolean_search.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/storage/myisam/ft_boolean_search.c b/storage/myisam/ft_boolean_search.c index 274f91e2691..20ead971afd 100644 --- a/storage/myisam/ft_boolean_search.c +++ b/storage/myisam/ft_boolean_search.c @@ -335,7 +335,23 @@ static int _ftb_no_dupes_cmp(void* not_used __attribute__((unused)), return CMP_NUM((*((my_off_t*)a)), (*((my_off_t*)b))); } -/* returns 1 if the search was finished (must-word wasn't found) */ +/* + When performing prefix search (a word with truncation operator), we + must preserve original prefix to ensure that characters which may be + expanded/contracted do not break the prefix. This is done by storing + newly found key immediatly after the original word in ftbw->word + buffer. + + ftbw->word= LENGTH WORD [ LENGTH1 WORD1 ] WEIGHT REFERENCE + LENGTH - 1 byte, length of the WORD + WORD - LENGTH bytes, the word itself + LENGTH1 - 1 byte, length of the WORD1, present in case of prefix search + WORD1 - LENGTH bytes, the word itself, present in case of prefix search + WEIGHT - 4 bytes (HA_FT_WLEN), either weight or number of subkeys + REFERENCE - rec_reflength bytes, pointer to the record + + returns 1 if the search was finished (must-word wasn't found) +*/ static int _ft2_search(FTB *ftb, FTB_WORD *ftbw, my_bool init_search) { int r; @@ -369,7 +385,8 @@ static int _ft2_search(FTB *ftb, FTB_WORD *ftbw, my_bool init_search) if (ftbw->docid[0] < max_docid) { sflag|= SEARCH_SAME; - _mi_dpointer(info, (uchar *)(ftbw->word + ftbw->len + HA_FT_WLEN), + _mi_dpointer(info, (uchar*) (lastkey_buf + HA_FT_WLEN + + (ftbw->off ? 0 : lastkey_buf[0] + 1)), max_docid); } r=_mi_search(info, ftbw->keyinfo, (uchar*) lastkey_buf, |