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Kirill Smelkov
mariadb
Commits
57d48132
Commit
57d48132
authored
21 years ago
by
monty@mysql.com
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Removed some test that was not relevant for MySQL (and which caused problems in MySQL 4.1)
parent
aa3f200c
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1
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32 additions
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23 deletions
+32
-23
sql/filesort.cc
sql/filesort.cc
+32
-23
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sql/filesort.cc
View file @
57d48132
...
...
@@ -51,17 +51,38 @@ static int merge_index(SORTPARAM *param,uchar *sort_buffer,
static
bool
save_index
(
SORTPARAM
*
param
,
uchar
**
sort_keys
,
uint
count
);
static
uint
sortlength
(
SORT_FIELD
*
sortorder
,
uint
length
);
/*
/*
Sort a table
SYNOPSIS
filesort()
table Table to sort
sortorder How to sort the table
s_length Number of elements in sortorder
select condition to apply to the rows
special Not used.
(This could be used to sort the rows pointed on by
select->file)
examined_rows Store number of examined rows here
IMPLEMENTATION
Creates a set of pointers that can be used to read the rows
in sorted order. This should be done with the functions
in records.cc
REQUIREMENTS
Before calling filesort, one must have done
table->file->info(HA_STATUS_VARIABLE)
RETURN
HA_POS_ERROR Error
# Number of rows
examined_rows will be set to number of examined rows
The result set is stored in table->io_cache or
table->record_pointers
*/
*/
ha_rows
filesort
(
TABLE
*
table
,
SORT_FIELD
*
sortorder
,
uint
s_length
,
SQL_SELECT
*
select
,
ha_rows
special
,
ha_rows
max_rows
,
...
...
@@ -127,8 +148,6 @@ ha_rows filesort(TABLE *table, SORT_FIELD *sortorder, uint s_length,
records
=
table
->
file
->
estimate_number_of_rows
();
selected_records_file
=
0
;
}
if
(
param
.
sort_length
==
param
.
ref_length
&&
records
>
param
.
max_rows
)
records
=
param
.
max_rows
;
/* purecov: inspected */
#ifdef USE_STRCOLL
if
(
use_strcoll
(
default_charset_info
)
&&
...
...
@@ -372,16 +391,6 @@ static ha_rows find_all_keys(SORTPARAM *param, SQL_SELECT *select,
if
(
write_keys
(
param
,
sort_keys
,
idx
,
buffpek_pointers
,
tempfile
))
DBUG_RETURN
(
HA_POS_ERROR
);
idx
=
0
;
if
(
param
->
ref_length
==
param
->
sort_length
&&
my_b_tell
(
tempfile
)
/
param
->
sort_length
>=
param
->
max_rows
)
{
/*
We are writing the result index file and have found all
rows that we need. Abort the sort and return the result.
*/
error
=
HA_ERR_END_OF_FILE
;
break
;
/* Found enough records */
}
indexpos
++
;
}
make_sortkey
(
param
,
sort_keys
[
idx
++
],
ref_pos
);
...
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