diff options
Diffstat (limited to 'myisam')
| -rw-r--r-- | myisam/mi_create.c | 2 | ||||
| -rw-r--r-- | myisam/mi_unique.c | 11 |
2 files changed, 11 insertions, 2 deletions
diff --git a/myisam/mi_create.c b/myisam/mi_create.c index 8aa2dd53027..039066c5b37 100644 --- a/myisam/mi_create.c +++ b/myisam/mi_create.c @@ -228,7 +228,7 @@ int mi_create(const char *name,uint keys,MI_KEYDEF *keydefs, if (uniques) { max_key_block_length= myisam_block_size; - max_key_length= MI_UNIQUE_HASH_LENGTH; + max_key_length= MI_UNIQUE_HASH_LENGTH + pointer; } for (i=0, keydef=keydefs ; i < keys ; i++ , keydef++) diff --git a/myisam/mi_unique.c b/myisam/mi_unique.c index b373693e6e0..ddba40214e7 100644 --- a/myisam/mi_unique.c +++ b/myisam/mi_unique.c @@ -24,7 +24,7 @@ my_bool mi_check_unique(MI_INFO *info, MI_UNIQUEDEF *def, byte *record, { my_off_t lastpos=info->lastpos; MI_KEYDEF *key= &info->s->keyinfo[def->key]; - uchar *key_buff=info->lastkey+info->s->base.max_key_length; + uchar *key_buff=info->lastkey2; DBUG_ENTER("mi_check_unique"); mi_unique_store(record+key->seg->start, unique_hash); @@ -80,7 +80,16 @@ ha_checksum mi_unique_hash(MI_UNIQUEDEF *def, const byte *record) if (keyseg->null_bit) { if (record[keyseg->null_pos] & keyseg->null_bit) + { + /* + Change crc in a way different from an empty string or 0. + (This is an optimisation; The code will work even if this isn't + done) + */ + crc=((crc << 8) + 511+ + (crc >> (8*sizeof(ha_checksum)-8))); continue; + } } pos= record+keyseg->start; if (keyseg->flag & HA_VAR_LENGTH) |