Commit dacff5a9 authored by unknown's avatar unknown
Browse files

Merge mysql.com:/home/mydev/mysql-4.1 

into mysql.com:/home/mydev/mysql-4.1-bug9188
parents 4528fd15 b753fd96

myisam/mi_search.c

+43 −8
Original line number Diff line number Diff line
@@ -210,9 +210,31 @@ int _mi_bin_search(MI_INFO *info, register MI_KEYDEF *keyinfo, uchar *page, 
} /* _mi_bin_search */





        /* Used instead of _mi_bin_search() when key is packed */

        /* Puts smaller or identical key in buff */

        /* Key is searched sequentially */

/*

  Locate a packed key in a key page.



  SYNOPSIS

    _mi_seq_search()

    info                        Open table information.

    keyinfo                     Key definition information.

    page                        Key page (beginning).

    key                         Search key.

    key_len                     Length to use from search key or USE_WHOLE_KEY

    comp_flag                   Search flags like SEARCH_SAME etc.

    ret_pos             RETURN  Position in key page behind this key.

    buff                RETURN  Copy of previous or identical unpacked key.

    last_key            RETURN  If key is last in page.



  DESCRIPTION

    Used instead of _mi_bin_search() when key is packed.

    Puts smaller or identical key in buff.

    Key is searched sequentially.



  RETURN

    > 0         Key in 'buff' is smaller than search key.

    0           Key in 'buff' is identical to search key.

    < 0         Not found.

*/



int _mi_seq_search(MI_INFO *info, register MI_KEYDEF *keyinfo, uchar *page,

                   uchar *key, uint key_len, uint comp_flag, uchar **ret_pos,
@@ -718,7 +740,19 @@ uint _mi_get_static_key(register MI_KEYDEF *keyinfo, uint nod_flag, 
} /* _mi_get_static_key */





/* Key with is packed against previous key or key with a NULL column */

/*

  get key witch is packed against previous key or key with a NULL column.



  SYNOPSIS

    _mi_get_pack_key()

    keyinfo                     key definition information.

    nod_flag                    If nod: Length of node pointer, else zero.

    page_pos            RETURN  position in key page behind this key.

    key                 IN/OUT  in: prev key, out: unpacked key.



  RETURN

    key_length + length of data pointer

*/



uint _mi_get_pack_key(register MI_KEYDEF *keyinfo, uint nod_flag,

                      register uchar **page_pos, register uchar *key)
@@ -1339,12 +1373,12 @@ _mi_calc_var_key_length(MI_KEYDEF *keyinfo,uint nod_flag, 


  Keys are compressed the following way:



  If the max length of first key segment <= 127 characters the prefix is

  If the max length of first key segment <= 127 bytes the prefix is

  1 byte else it's 2 byte



  prefix byte    The high bit is set if this is a prefix for the prev key

  prefix byte(s) The high bit is set if this is a prefix for the prev key

  length         Packed length if the previous was a prefix byte

  [length]       Length character of data

  [length]       data bytes ('length' bytes)

  next-key-seg   Next key segments



  If the first segment can have NULL:
@@ -1537,7 +1571,8 @@ _mi_calc_var_pack_key_length(MI_KEYDEF *keyinfo,uint nod_flag,uchar *next_key, 
            s_temp->part_of_prev_key= new_ref_length;

            s_temp->prev_length=          org_key_length -

              (new_ref_length-pack_marker);

            s_temp->n_ref_length= s_temp->n_length= s_temp->prev_length;

            s_temp->n_ref_length= s_temp->part_of_prev_key;

            s_temp->n_length= s_temp->prev_length;

            n_length=             get_pack_length(s_temp->prev_length);

            s_temp->prev_key+=    (new_ref_length - pack_marker);

            length+=              s_temp->prev_length + n_length;

myisam/mi_write.c

+24 −2
Original line number Diff line number Diff line
@@ -414,8 +414,30 @@ static int w_search(register MI_INFO *info, register MI_KEYDEF *keyinfo, 
} /* w_search */





	/* Insert new key at right of key_pos */

	/* Returns 2 if key contains key to upper level */

/*

  Insert new key.



  SYNOPSIS

    _mi_insert()

    info                        Open table information.

    keyinfo                     Key definition information.

    key                         New key.

    anc_buff                    Key page (beginning).

    key_pos                     Position in key page where to insert.

    key_buff                    Copy of previous key.

    father_buff                 parent key page for balancing.

    father_key_pos              position in parent key page for balancing.

    father_page                 position of parent key page in file.

    insert_last                 If to append at end of page.



  DESCRIPTION

    Insert new key at right of key_pos.



  RETURN

    2           if key contains key to upper level.

    0           OK.

    < 0         Error.

*/



int _mi_insert(register MI_INFO *info, register MI_KEYDEF *keyinfo,

	       uchar *key, uchar *anc_buff, uchar *key_pos, uchar *key_buff,

mysql-test/r/myisam.result

+8 −0
Original line number Diff line number Diff line
@@ -573,3 +573,11 @@ truncate table t1; 
ERROR HY000: MyISAM table 't1' is in use (most likely by a MERGE table). Try FLUSH TABLES.

insert into t1 values (1);

drop table t1,t2;

create table t1 (c1 int, c2 varchar(4) not null default '',

key(c2(3))) default charset=utf8;

insert into t1 values (1,'A'), (2, 'B'), (3, 'A');

update t1 set c2='A  B' where c1=2;

check table t1;

Table	Op	Msg_type	Msg_text

test.t1	check	status	OK

drop table t1;

mysql-test/t/myisam.test

+10 −0
Original line number Diff line number Diff line
@@ -550,3 +550,13 @@ truncate table t1; 
insert into t1 values (1);

drop table t1,t2;



#

# bug9188 - Corruption Can't open file: 'table.MYI' (errno: 145)

#

create table t1 (c1 int, c2 varchar(4) not null default '',

                 key(c2(3))) default charset=utf8;

insert into t1 values (1,'A'), (2, 'B'), (3, 'A');

update t1 set c2='A  B' where c1=2;

check table t1;

drop table t1;