diff options
Diffstat (limited to 'myisam/mi_search.c')
| -rw-r--r-- | myisam/mi_search.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/myisam/mi_search.c b/myisam/mi_search.c index 41d53e76241..32db69144d8 100644 --- a/myisam/mi_search.c +++ b/myisam/mi_search.c @@ -1441,6 +1441,37 @@ uint _mi_keylength(MI_KEYDEF *keyinfo, register uchar *key) } /* _mi_keylength */ +/* + Calculate length of part key. + + Used in mi_rkey() to find the key found for the key-part that was used. + This is needed in case of multi-byte character sets where we may search + after '0xDF' but find 'ss' +*/ + +uint _mi_keylength_part(MI_KEYDEF *keyinfo, register uchar *key, + MI_KEYSEG *end) +{ + reg1 MI_KEYSEG *keyseg; + uchar *start= key; + + for (keyseg=keyinfo->seg ; keyseg != end ; keyseg++) + { + if (keyseg->flag & HA_NULL_PART) + if (!*key++) + continue; + if (keyseg->flag & (HA_SPACE_PACK | HA_BLOB_PART | HA_VAR_LENGTH)) + { + uint length; + get_key_length(length,key); + key+=length; + } + else + key+= keyseg->length; + } + return (uint) (key-start); +} + /* Move a key */ uchar *_mi_move_key(MI_KEYDEF *keyinfo, uchar *to, uchar *from) |