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Fixed max_key_length when using UNIQUE keys.

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This fixed a bug in GROUP BY on a BLOB column with NULL values.


myisam/mi_create.c:
  Fixed max_key_length when using UNIQUE keys.
myisam/mi_unique.c:
  Simple optimization
  Make different CRC for keys with null and empty strings.
mysql-test/r/group_by.result:
  Updated results
mysql-test/t/group_by.test:
  Test of bug
This commit is contained in:
unknown 2002-12-27 21:39:35 +02:00
commit d78c9adb55
4 changed files with 30 additions and 2 deletions
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11
myisam/mi_unique.c
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@ -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)