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hp_hash.c
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hp_hash.c
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/* Copyright (C) 2000-2006 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* The hash functions used for saveing keys */
#include "heapdef.h"
#include <m_ctype.h>
/*
Find out how many rows there is in the given range
SYNOPSIS
hp_rb_records_in_range()
info HEAP handler
inx Index to use
min_key Min key. Is = 0 if no min range
max_key Max key. Is = 0 if no max range
NOTES
min_key.flag can have one of the following values:
HA_READ_KEY_EXACT Include the key in the range
HA_READ_AFTER_KEY Don't include key in range
max_key.flag can have one of the following values:
HA_READ_BEFORE_KEY Don't include key in range
HA_READ_AFTER_KEY Include all 'end_key' values in the range
RETURN
HA_POS_ERROR Something is wrong with the index tree.
0 There is no matching keys in the given range
number > 0 There is approximately 'number' matching rows in
the range.
*/
ha_rows hp_rb_records_in_range(HP_INFO *info, int inx, key_range *min_key,
key_range *max_key)
{
ha_rows start_pos, end_pos;
HP_KEYDEF *keyinfo= info->s->keydef + inx;
TREE *rb_tree = &keyinfo->rb_tree;
heap_rb_param custom_arg;
DBUG_ENTER("hp_rb_records_in_range");
info->lastinx= inx;
custom_arg.keyseg= keyinfo->seg;
custom_arg.search_flag= SEARCH_FIND | SEARCH_SAME;
if (min_key)
{
custom_arg.key_length= hp_rb_pack_key(keyinfo, (uchar*) info->recbuf,
(uchar*) min_key->key,
min_key->length);
start_pos= tree_record_pos(rb_tree, info->recbuf, min_key->flag,
&custom_arg);
}
else
{
start_pos= 0;
}
if (max_key)
{
custom_arg.key_length= hp_rb_pack_key(keyinfo, (uchar*) info->recbuf,
(uchar*) max_key->key,
max_key->length);
end_pos= tree_record_pos(rb_tree, info->recbuf, max_key->flag,
&custom_arg);
}
else
{
end_pos= rb_tree->elements_in_tree + (ha_rows)1;
}
DBUG_PRINT("info",("start_pos: %lu end_pos: %lu", (ulong) start_pos,
(ulong) end_pos));
if (start_pos == HA_POS_ERROR || end_pos == HA_POS_ERROR)
DBUG_RETURN(HA_POS_ERROR);
DBUG_RETURN(end_pos < start_pos ? (ha_rows) 0 :
(end_pos == start_pos ? (ha_rows) 1 : end_pos - start_pos));
}
/* Search after a record based on a key */
/* Sets info->current_ptr to found record */
/* next_flag: Search=0, next=1, prev =2, same =3 */
byte *hp_search(HP_INFO *info, HP_KEYDEF *keyinfo, const byte *key,
uint nextflag)
{
reg1 HASH_INFO *pos,*prev_ptr;
int flag;
uint old_nextflag;
HP_SHARE *share=info->s;
DBUG_ENTER("hp_search");
old_nextflag=nextflag;
flag=1;
prev_ptr=0;
if (share->records)
{
pos=hp_find_hash(&keyinfo->block, hp_mask(hp_hashnr(keyinfo, key),
share->blength, share->records));
do
{
if (!hp_key_cmp(keyinfo, pos->ptr_to_rec, key))
{
switch (nextflag) {
case 0: /* Search after key */
DBUG_PRINT("exit", ("found key at 0x%lx", (long) pos->ptr_to_rec));
info->current_hash_ptr=pos;
DBUG_RETURN(info->current_ptr= pos->ptr_to_rec);
case 1: /* Search next */
if (pos->ptr_to_rec == info->current_ptr)
nextflag=0;
break;
case 2: /* Search previous */
if (pos->ptr_to_rec == info->current_ptr)
{
my_errno=HA_ERR_KEY_NOT_FOUND; /* If gpos == 0 */
info->current_hash_ptr=prev_ptr;
DBUG_RETURN(info->current_ptr=prev_ptr ? prev_ptr->ptr_to_rec : 0);
}
prev_ptr=pos; /* Prev. record found */
break;
case 3: /* Search same */
if (pos->ptr_to_rec == info->current_ptr)
{
info->current_hash_ptr=pos;
DBUG_RETURN(info->current_ptr);
}
}
}
if (flag)
{
flag=0; /* Reset flag */
if (hp_find_hash(&keyinfo->block,
hp_mask(hp_rec_hashnr(keyinfo, pos->ptr_to_rec),
share->blength, share->records)) != pos)
break; /* Wrong link */
}
}
while ((pos=pos->next_key));
}
my_errno=HA_ERR_KEY_NOT_FOUND;
if (nextflag == 2 && ! info->current_ptr)
{
/* Do a previous from end */
info->current_hash_ptr=prev_ptr;
DBUG_RETURN(info->current_ptr=prev_ptr ? prev_ptr->ptr_to_rec : 0);
}
if (old_nextflag && nextflag)
my_errno=HA_ERR_RECORD_CHANGED; /* Didn't find old record */
DBUG_PRINT("exit",("Error: %d",my_errno));
info->current_hash_ptr=0;
DBUG_RETURN((info->current_ptr= 0));
}
/*
Search next after last read; Assumes that the table hasn't changed
since last read !
*/
byte *hp_search_next(HP_INFO *info, HP_KEYDEF *keyinfo, const byte *key,
HASH_INFO *pos)
{
DBUG_ENTER("hp_search_next");
while ((pos= pos->next_key))
{
if (! hp_key_cmp(keyinfo, pos->ptr_to_rec, key))
{
info->current_hash_ptr=pos;
DBUG_RETURN (info->current_ptr= pos->ptr_to_rec);
}
}
my_errno=HA_ERR_KEY_NOT_FOUND;
DBUG_PRINT("exit",("Error: %d",my_errno));
info->current_hash_ptr=0;
DBUG_RETURN ((info->current_ptr= 0));
}
/*
Calculate position number for hash value.
SYNOPSIS
hp_mask()
hashnr Hash value
buffmax Value such that
2^(n-1) < maxlength <= 2^n = buffmax
maxlength
RETURN
Array index, in [0..maxlength)
*/
ulong hp_mask(ulong hashnr, ulong buffmax, ulong maxlength)
{
if ((hashnr & (buffmax-1)) < maxlength) return (hashnr & (buffmax-1));
return (hashnr & ((buffmax >> 1) -1));
}
/*
Change
next_link -> ... -> X -> pos
to
next_link -> ... -> X -> newlink
*/
void hp_movelink(HASH_INFO *pos, HASH_INFO *next_link, HASH_INFO *newlink)
{
HASH_INFO *old_link;
do
{
old_link=next_link;
}
while ((next_link=next_link->next_key) != pos);
old_link->next_key=newlink;
return;
}
#ifndef NEW_HASH_FUNCTION
/* Calc hashvalue for a key */
ulong hp_hashnr(register HP_KEYDEF *keydef, register const byte *key)
{
/*register*/
ulong nr=1, nr2=4;
HA_KEYSEG *seg,*endseg;
for (seg=keydef->seg,endseg=seg+keydef->keysegs ; seg < endseg ; seg++)
{
uchar *pos=(uchar*) key;
key+=seg->length;
if (seg->null_bit)
{
key++; /* Skip null byte */
if (*pos) /* Found null */
{
nr^= (nr << 1) | 1;
/* Add key pack length (2) to key for VARCHAR segments */
if (seg->type == HA_KEYTYPE_VARTEXT1)
key+= 2;
continue;
}
pos++;
}
if (seg->type == HA_KEYTYPE_TEXT)
{
CHARSET_INFO *cs= seg->charset;
uint length= seg->length;
if (cs->mbmaxlen > 1)
{
uint char_length;
char_length= my_charpos(cs, pos, pos + length, length/cs->mbmaxlen);
set_if_smaller(length, char_length);
}
cs->coll->hash_sort(cs, pos, length, &nr, &nr2);
}
else if (seg->type == HA_KEYTYPE_VARTEXT1) /* Any VARCHAR segments */
{
CHARSET_INFO *cs= seg->charset;
uint pack_length= 2; /* Key packing is constant */
uint length= uint2korr(pos);
if (cs->mbmaxlen > 1)
{
uint char_length;
char_length= my_charpos(cs, pos +pack_length,
pos +pack_length + length,
seg->length/cs->mbmaxlen);
set_if_smaller(length, char_length);
}
cs->coll->hash_sort(cs, pos+pack_length, length, &nr, &nr2);
key+= pack_length;
}
else
{
for (; pos < (uchar*) key ; pos++)
{
nr^=(ulong) ((((uint) nr & 63)+nr2)*((uint) *pos)) + (nr << 8);
nr2+=3;
}
}
}
DBUG_PRINT("exit", ("hash: 0x%lx", nr));
return((ulong) nr);
}
/* Calc hashvalue for a key in a record */
ulong hp_rec_hashnr(register HP_KEYDEF *keydef, register const byte *rec)
{
ulong nr=1, nr2=4;
HA_KEYSEG *seg,*endseg;
for (seg=keydef->seg,endseg=seg+keydef->keysegs ; seg < endseg ; seg++)
{
uchar *pos=(uchar*) rec+seg->start,*end=pos+seg->length;
if (seg->null_bit)
{
if (rec[seg->null_pos] & seg->null_bit)
{
nr^= (nr << 1) | 1;
continue;
}
}
if (seg->type == HA_KEYTYPE_TEXT)
{
CHARSET_INFO *cs= seg->charset;
uint char_length= seg->length;
if (cs->mbmaxlen > 1)
{
char_length= my_charpos(cs, pos, pos + char_length,
char_length / cs->mbmaxlen);
set_if_smaller(char_length, seg->length); /* QQ: ok to remove? */
}
cs->coll->hash_sort(cs, pos, char_length, &nr, &nr2);
}
else if (seg->type == HA_KEYTYPE_VARTEXT1) /* Any VARCHAR segments */
{
CHARSET_INFO *cs= seg->charset;
uint pack_length= seg->bit_start;
uint length= (pack_length == 1 ? (uint) *(uchar*) pos : uint2korr(pos));
if (cs->mbmaxlen > 1)
{
uint char_length;
char_length= my_charpos(cs, pos + pack_length,
pos + pack_length + length,
seg->length/cs->mbmaxlen);
set_if_smaller(length, char_length);
}
cs->coll->hash_sort(cs, pos+pack_length, length, &nr, &nr2);
}
else
{
for (; pos < end ; pos++)
{
nr^=(ulong) ((((uint) nr & 63)+nr2)*((uint) *pos))+ (nr << 8);
nr2+=3;
}
}
}
DBUG_PRINT("exit", ("hash: 0x%lx", nr));
return(nr);
}
#else
/*
* Fowler/Noll/Vo hash
*
* The basis of the hash algorithm was taken from an idea sent by email to the
* IEEE Posix P1003.2 mailing list from Phong Vo ([email protected]) and
* Glenn Fowler ([email protected]). Landon Curt Noll ([email protected])
* later improved on their algorithm.
*
* The magic is in the interesting relationship between the special prime
* 16777619 (2^24 + 403) and 2^32 and 2^8.
*
* This hash produces the fewest collisions of any function that we've seen so
* far, and works well on both numbers and strings.
*/
ulong hp_hashnr(register HP_KEYDEF *keydef, register const byte *key)
{
/*
Note, if a key consists of a combination of numeric and
a text columns, it most likely won't work well.
Making text columns work with NEW_HASH_FUNCTION
needs also changes in strings/ctype-xxx.c.
*/
ulong nr= 1, nr2= 4;
HA_KEYSEG *seg,*endseg;
for (seg=keydef->seg,endseg=seg+keydef->keysegs ; seg < endseg ; seg++)
{
uchar *pos=(uchar*) key;
key+=seg->length;
if (seg->null_bit)
{
key++;
if (*pos)
{
nr^= (nr << 1) | 1;
/* Add key pack length (2) to key for VARCHAR segments */
if (seg->type == HA_KEYTYPE_VARTEXT1)
key+= 2;
continue;
}
pos++;
}
if (seg->type == HA_KEYTYPE_TEXT)
{
seg->charset->coll->hash_sort(seg->charset, pos, ((uchar*)key)-pos,
&nr, &nr2);
}
else if (seg->type == HA_KEYTYPE_VARTEXT1) /* Any VARCHAR segments */
{
uint pack_length= 2; /* Key packing is constant */
uint length= uint2korr(pos);
seg->charset->coll->hash_sort(seg->charset, pos+pack_length, length,
&nr, &nr2);
key+= pack_length;
}
else
{
for ( ; pos < (uchar*) key ; pos++)
{
nr *=16777619;
nr ^=(uint) *pos;
}
}
}
DBUG_PRINT("exit", ("hash: 0x%lx", nr));
return(nr);
}
/* Calc hashvalue for a key in a record */
ulong hp_rec_hashnr(register HP_KEYDEF *keydef, register const byte *rec)
{
ulong nr= 1, nr2= 4;
HA_KEYSEG *seg,*endseg;
for (seg=keydef->seg,endseg=seg+keydef->keysegs ; seg < endseg ; seg++)
{
uchar *pos=(uchar*) rec+seg->start;
if (seg->null_bit)
{
if (rec[seg->null_pos] & seg->null_bit)
{
nr^= (nr << 1) | 1;
continue;
}
}
if (seg->type == HA_KEYTYPE_TEXT)
{
uint char_length= seg->length; /* TODO: fix to use my_charpos() */
seg->charset->coll->hash_sort(seg->charset, pos, char_length,
&nr, &nr2);
}
else if (seg->type == HA_KEYTYPE_VARTEXT1) /* Any VARCHAR segments */
{
uint pack_length= seg->bit_start;
uint length= (pack_length == 1 ? (uint) *(uchar*) pos : uint2korr(pos));
seg->charset->coll->hash_sort(seg->charset, pos+pack_length,
length, &nr, &nr2);
}
else
{
uchar *end= pos+seg->length;
for ( ; pos < end ; pos++)
{
nr *=16777619;
nr ^=(uint) *pos;
}
}
}
DBUG_PRINT("exit", ("hash: 0x%lx", nr));
return(nr);
}
#endif
/*
Compare keys for two records. Returns 0 if they are identical
SYNOPSIS
hp_rec_key_cmp()
keydef Key definition
rec1 Record to compare
rec2 Other record to compare
diff_if_only_endspace_difference
Different number of end space is significant
NOTES
diff_if_only_endspace_difference is used to allow us to insert
'a' and 'a ' when there is an an unique key.
RETURN
0 Key is identical
<> 0 Key differes
*/
int hp_rec_key_cmp(HP_KEYDEF *keydef, const byte *rec1, const byte *rec2,
my_bool diff_if_only_endspace_difference)
{
HA_KEYSEG *seg,*endseg;
for (seg=keydef->seg,endseg=seg+keydef->keysegs ; seg < endseg ; seg++)
{
if (seg->null_bit)
{
if ((rec1[seg->null_pos] & seg->null_bit) !=
(rec2[seg->null_pos] & seg->null_bit))
return 1;
if (rec1[seg->null_pos] & seg->null_bit)
continue;
}
if (seg->type == HA_KEYTYPE_TEXT)
{
CHARSET_INFO *cs= seg->charset;
uint char_length1;
uint char_length2;
uchar *pos1= (uchar*)rec1 + seg->start;
uchar *pos2= (uchar*)rec2 + seg->start;
if (cs->mbmaxlen > 1)
{
uint char_length= seg->length / cs->mbmaxlen;
char_length1= my_charpos(cs, pos1, pos1 + seg->length, char_length);
set_if_smaller(char_length1, seg->length);
char_length2= my_charpos(cs, pos2, pos2 + seg->length, char_length);
set_if_smaller(char_length2, seg->length);
}
else
{
char_length1= char_length2= seg->length;
}
if (seg->charset->coll->strnncollsp(seg->charset,
pos1,char_length1,
pos2,char_length2, 0))
return 1;
}
else if (seg->type == HA_KEYTYPE_VARTEXT1) /* Any VARCHAR segments */
{
uchar *pos1= (uchar*) rec1 + seg->start;
uchar *pos2= (uchar*) rec2 + seg->start;
uint char_length1, char_length2;
uint pack_length= seg->bit_start;
CHARSET_INFO *cs= seg->charset;
if (pack_length == 1)
{
char_length1= (uint) *(uchar*) pos1++;
char_length2= (uint) *(uchar*) pos2++;
}
else
{
char_length1= uint2korr(pos1);
char_length2= uint2korr(pos2);
pos1+= 2;
pos2+= 2;
}
if (cs->mbmaxlen > 1)
{
uint safe_length1= char_length1;
uint safe_length2= char_length2;
uint char_length= seg->length / cs->mbmaxlen;
char_length1= my_charpos(cs, pos1, pos1 + char_length1, char_length);
set_if_smaller(char_length1, safe_length1);
char_length2= my_charpos(cs, pos2, pos2 + char_length2, char_length);
set_if_smaller(char_length2, safe_length2);
}
if (cs->coll->strnncollsp(seg->charset,
pos1, char_length1,
pos2, char_length2,
seg->flag & HA_END_SPACE_ARE_EQUAL ?
0 : diff_if_only_endspace_difference))
return 1;
}
else
{
if (bcmp(rec1+seg->start,rec2+seg->start,seg->length))
return 1;
}
}
return 0;
}
/* Compare a key in a record to a whole key */
int hp_key_cmp(HP_KEYDEF *keydef, const byte *rec, const byte *key)
{
HA_KEYSEG *seg,*endseg;
for (seg=keydef->seg,endseg=seg+keydef->keysegs ;
seg < endseg ;
key+= (seg++)->length)
{
if (seg->null_bit)
{
int found_null=test(rec[seg->null_pos] & seg->null_bit);
if (found_null != (int) *key++)
return 1;
if (found_null)
{
/* Add key pack length (2) to key for VARCHAR segments */
if (seg->type == HA_KEYTYPE_VARTEXT1)
key+= 2;
continue;
}
}
if (seg->type == HA_KEYTYPE_TEXT)
{
CHARSET_INFO *cs= seg->charset;
uint char_length_key;
uint char_length_rec;
uchar *pos= (uchar*) rec + seg->start;
if (cs->mbmaxlen > 1)
{
uint char_length= seg->length / cs->mbmaxlen;
char_length_key= my_charpos(cs, key, key + seg->length, char_length);
set_if_smaller(char_length_key, seg->length);
char_length_rec= my_charpos(cs, pos, pos + seg->length, char_length);
set_if_smaller(char_length_rec, seg->length);
}
else
{
char_length_key= seg->length;
char_length_rec= seg->length;
}
if (seg->charset->coll->strnncollsp(seg->charset,
(uchar*) pos, char_length_rec,
(uchar*) key, char_length_key, 0))
return 1;
}
else if (seg->type == HA_KEYTYPE_VARTEXT1) /* Any VARCHAR segments */
{
uchar *pos= (uchar*) rec + seg->start;
CHARSET_INFO *cs= seg->charset;
uint pack_length= seg->bit_start;
uint char_length_rec= (pack_length == 1 ? (uint) *(uchar*) pos :
uint2korr(pos));
/* Key segments are always packed with 2 bytes */
uint char_length_key= uint2korr(key);
pos+= pack_length;
key+= 2; /* skip key pack length */
if (cs->mbmaxlen > 1)
{
uint char_length1, char_length2;
char_length1= char_length2= seg->length / cs->mbmaxlen;
char_length1= my_charpos(cs, key, key + char_length_key, char_length1);
set_if_smaller(char_length_key, char_length1);
char_length2= my_charpos(cs, pos, pos + char_length_rec, char_length2);
set_if_smaller(char_length_rec, char_length2);
}
if (cs->coll->strnncollsp(seg->charset,
(uchar*) pos, char_length_rec,
(uchar*) key, char_length_key, 0))
return 1;
}
else
{
if (bcmp(rec+seg->start,key,seg->length))
return 1;
}
}
return 0;
}
/* Copy a key from a record to a keybuffer */
void hp_make_key(HP_KEYDEF *keydef, byte *key, const byte *rec)
{
HA_KEYSEG *seg,*endseg;
for (seg=keydef->seg,endseg=seg+keydef->keysegs ; seg < endseg ; seg++)
{
CHARSET_INFO *cs= seg->charset;
uint char_length= seg->length;
uchar *pos= (uchar*) rec + seg->start;
if (seg->null_bit)
*key++= test(rec[seg->null_pos] & seg->null_bit);
if (cs->mbmaxlen > 1)
{
char_length= my_charpos(cs, pos, pos + seg->length,
char_length / cs->mbmaxlen);
set_if_smaller(char_length, seg->length); /* QQ: ok to remove? */
}
if (seg->type == HA_KEYTYPE_VARTEXT1)
char_length+= seg->bit_start; /* Copy also length */
memcpy(key,rec+seg->start,(size_t) char_length);
key+= char_length;
}
}
#define FIX_LENGTH(cs, pos, length, char_length) \
do { \
if (length > char_length) \
char_length= my_charpos(cs, pos, pos+length, char_length); \
set_if_smaller(char_length,length); \
} while(0)
uint hp_rb_make_key(HP_KEYDEF *keydef, byte *key,
const byte *rec, byte *recpos)
{
byte *start_key= key;
HA_KEYSEG *seg, *endseg;
for (seg= keydef->seg, endseg= seg + keydef->keysegs; seg < endseg; seg++)
{
uint char_length;
if (seg->null_bit)
{
if (!(*key++= 1 - test(rec[seg->null_pos] & seg->null_bit)))
continue;
}
if (seg->flag & HA_SWAP_KEY)
{
uint length= seg->length;
byte *pos= (byte*) rec + seg->start;
#ifdef HAVE_ISNAN
if (seg->type == HA_KEYTYPE_FLOAT)
{
float nr;
float4get(nr, pos);
if (isnan(nr))
{
/* Replace NAN with zero */
bzero(key, length);
key+= length;
continue;
}
}
else if (seg->type == HA_KEYTYPE_DOUBLE)
{
double nr;
float8get(nr, pos);
if (isnan(nr))
{
bzero(key, length);
key+= length;
continue;
}
}
#endif
pos+= length;
while (length--)
{
*key++= *--pos;
}
continue;
}
if (seg->flag & HA_VAR_LENGTH_PART)
{
uchar *pos= (uchar*) rec + seg->start;
uint length= seg->length;
uint pack_length= seg->bit_start;
uint tmp_length= (pack_length == 1 ? (uint) *(uchar*) pos :
uint2korr(pos));
CHARSET_INFO *cs= seg->charset;
char_length= length/cs->mbmaxlen;
pos+= pack_length; /* Skip VARCHAR length */
set_if_smaller(length,tmp_length);
FIX_LENGTH(cs, pos, length, char_length);
store_key_length_inc(key,char_length);
memcpy((byte*) key,(byte*) pos,(size_t) char_length);
key+= char_length;
continue;
}
char_length= seg->length;
if (seg->charset->mbmaxlen > 1)
{
char_length= my_charpos(seg->charset,
rec + seg->start, rec + seg->start + char_length,
char_length / seg->charset->mbmaxlen);
set_if_smaller(char_length, seg->length); /* QQ: ok to remove? */
if (char_length < seg->length)
seg->charset->cset->fill(seg->charset, (char*) key + char_length,
seg->length - char_length, ' ');
}
memcpy(key, rec + seg->start, (size_t) char_length);
key+= seg->length;
}
memcpy(key, &recpos, sizeof(byte*));
return (uint) (key - start_key);
}
uint hp_rb_pack_key(HP_KEYDEF *keydef, uchar *key, const uchar *old,
uint k_len)
{
HA_KEYSEG *seg, *endseg;
uchar *start_key= key;
for (seg= keydef->seg, endseg= seg + keydef->keysegs;
seg < endseg && (int) k_len > 0; old+= seg->length, seg++)
{
uint char_length;
if (seg->null_bit)
{
k_len--;
if (!(*key++= (char) 1 - *old++))
{
k_len-= seg->length;
continue;
}
}
if (seg->flag & HA_SWAP_KEY)
{
uint length= seg->length;
byte *pos= (byte*) old + length;
k_len-= length;
while (length--)
{
*key++= *--pos;
}
continue;
}
if (seg->flag & (HA_VAR_LENGTH_PART | HA_BLOB_PART))
{
/* Length of key-part used with heap_rkey() always 2 */
uint tmp_length=uint2korr(old);
uint length= seg->length;
CHARSET_INFO *cs= seg->charset;
char_length= length/cs->mbmaxlen;
k_len-= 2+length;
old+= 2;
set_if_smaller(length,tmp_length); /* Safety */
FIX_LENGTH(cs, old, length, char_length);
store_key_length_inc(key,char_length);
memcpy((byte*) key, old,(size_t) char_length);
key+= char_length;
continue;
}
char_length= seg->length;
if (seg->charset->mbmaxlen > 1)
{
char_length= my_charpos(seg->charset, old, old+char_length,
char_length / seg->charset->mbmaxlen);
set_if_smaller(char_length, seg->length); /* QQ: ok to remove? */
if (char_length < seg->length)
seg->charset->cset->fill(seg->charset, (char*) key + char_length,
seg->length - char_length, ' ');
}
memcpy(key, old, (size_t) char_length);
key+= seg->length;
k_len-= seg->length;
}
return (uint) (key - start_key);
}
uint hp_rb_key_length(HP_KEYDEF *keydef,
const byte *key __attribute__((unused)))
{
return keydef->length;
}
uint hp_rb_null_key_length(HP_KEYDEF *keydef, const byte *key)
{
const byte *start_key= key;
HA_KEYSEG *seg, *endseg;
for (seg= keydef->seg, endseg= seg + keydef->keysegs; seg < endseg; seg++)
{
if (seg->null_bit && !*key++)
continue;
key+= seg->length;
}
return (uint) (key - start_key);
}
uint hp_rb_var_key_length(HP_KEYDEF *keydef, const byte *key)
{
const byte *start_key= key;
HA_KEYSEG *seg, *endseg;
for (seg= keydef->seg, endseg= seg + keydef->keysegs; seg < endseg; seg++)
{
uint length= seg->length;
if (seg->null_bit && !*key++)
continue;
if (seg->flag & (HA_VAR_LENGTH_PART | HA_BLOB_PART))
{
get_key_length(length, key);
}
key+= length;
}
return (uint) (key - start_key);
}
/*
Test if any of the key parts are NULL.
Return:
1 if any of the key parts was NULL
0 otherwise
*/
my_bool hp_if_null_in_key(HP_KEYDEF *keydef, const byte *record)
{
HA_KEYSEG *seg,*endseg;
for (seg=keydef->seg,endseg=seg+keydef->keysegs ; seg < endseg ; seg++)
{
if (seg->null_bit && (record[seg->null_pos] & seg->null_bit))
return 1;
}
return 0;
}
/*
Update auto_increment info
SYNOPSIS
update_auto_increment()
info MyISAM handler
record Row to update
IMPLEMENTATION
Only replace the auto_increment value if it is higher than the previous
one. For signed columns we don't update the auto increment value if it's
less than zero.
*/
void heap_update_auto_increment(HP_INFO *info, const byte *record)
{
ulonglong value= 0; /* Store unsigned values here */
longlong s_value= 0; /* Store signed values here */
HA_KEYSEG *keyseg= info->s->keydef[info->s->auto_key - 1].seg;
const uchar *key= (uchar*) record + keyseg->start;
switch (info->s->auto_key_type) {
case HA_KEYTYPE_INT8:
s_value= (longlong) *(char*)key;
break;
case HA_KEYTYPE_BINARY:
value=(ulonglong) *(uchar*) key;
break;
case HA_KEYTYPE_SHORT_INT:
s_value= (longlong) sint2korr(key);
break;
case HA_KEYTYPE_USHORT_INT:
value=(ulonglong) uint2korr(key);
break;
case HA_KEYTYPE_LONG_INT:
s_value= (longlong) sint4korr(key);
break;
case HA_KEYTYPE_ULONG_INT:
value=(ulonglong) uint4korr(key);
break;
case HA_KEYTYPE_INT24:
s_value= (longlong) sint3korr(key);
break;
case HA_KEYTYPE_UINT24:
value=(ulonglong) uint3korr(key);
break;
case HA_KEYTYPE_FLOAT: /* This shouldn't be used */
{
float f_1;
float4get(f_1,key);
/* Ignore negative values */
value = (f_1 < (float) 0.0) ? 0 : (ulonglong) f_1;
break;
}
case HA_KEYTYPE_DOUBLE: /* This shouldn't be used */
{
double f_1;
float8get(f_1,key);
/* Ignore negative values */
value = (f_1 < 0.0) ? 0 : (ulonglong) f_1;
break;
}
case HA_KEYTYPE_LONGLONG:
s_value= sint8korr(key);
break;
case HA_KEYTYPE_ULONGLONG:
value= uint8korr(key);
break;
default:
DBUG_ASSERT(0);
value=0; /* Error */
break;
}
/*
The following code works becasue if s_value < 0 then value is 0
and if s_value == 0 then value will contain either s_value or the
correct value.