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Removed some test that was not relevant for MySQL (and which caused problems in MySQL 4.1)

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monty@mysql.com 2003-12-21 16:32:32 +02:00
parent aa3f200c03
commit 57d4813200
1 changed files with 30 additions and 21 deletions
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51
sql/filesort.cc
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@ -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);
/*
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
/*
Sort a table
Before calling filesort, one must have done
table->file->info(HA_STATUS_VARIABLE)
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
The result set is stored in table->io_cache or
table->record_pointers
*/
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);