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filesort.cc
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2102 lines (1889 loc) · 62.4 KB
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/*
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file
@brief
Sorts a database
*/
#include "sql_priv.h"
#include "filesort.h"
#include "unireg.h" // REQUIRED by other includes
#ifdef HAVE_STDDEF_H
#include <stddef.h> /* for macro offsetof */
#endif
#include <m_ctype.h>
#include "sql_sort.h"
#include "probes_mysql.h"
#include "opt_range.h" // SQL_SELECT
#include "bounded_queue.h"
#include "filesort_utils.h"
#include "sql_select.h"
#include "debug_sync.h"
#include "opt_trace.h"
#include "sql_optimizer.h" // JOIN
#include "sql_base.h"
#include <algorithm>
#include <utility>
using std::max;
using std::min;
/* functions defined in this file */
static uchar *read_buffpek_from_file(IO_CACHE *buffer_file, uint count,
uchar *buf);
static ha_rows find_all_keys(Sort_param *param,SQL_SELECT *select,
Filesort_info *fs_info,
IO_CACHE *buffer_file,
IO_CACHE *tempfile,
Bounded_queue<uchar, uchar> *pq,
ha_rows *found_rows);
static int write_keys(Sort_param *param, Filesort_info *fs_info,
uint count, IO_CACHE *buffer_file, IO_CACHE *tempfile);
static void register_used_fields(Sort_param *param);
static int merge_index(Sort_param *param,uchar *sort_buffer,
BUFFPEK *buffpek,
uint maxbuffer,IO_CACHE *tempfile,
IO_CACHE *outfile);
static bool save_index(Sort_param *param, uint count,
Filesort_info *table_sort);
static uint suffix_length(ulong string_length);
static SORT_ADDON_FIELD *get_addon_fields(ulong max_length_for_sort_data,
Field **ptabfield,
uint sortlength, uint *plength);
static void unpack_addon_fields(struct st_sort_addon_field *addon_field,
uchar *buff);
static bool check_if_pq_applicable(Opt_trace_context *trace,
Sort_param *param, Filesort_info *info,
TABLE *table,
ha_rows records, ulong memory_available);
void Sort_param::init_for_filesort(uint sortlen, TABLE *table,
ulong max_length_for_sort_data,
ha_rows maxrows, bool sort_positions)
{
sort_length= sortlen;
ref_length= table->file->ref_length;
if (!(table->file->ha_table_flags() & HA_FAST_KEY_READ) &&
!table->fulltext_searched && !sort_positions)
{
/*
Get the descriptors of all fields whose values are appended
to sorted fields and get its total length in addon_length.
*/
addon_field= get_addon_fields(max_length_for_sort_data,
table->field, sort_length, &addon_length);
}
if (addon_field)
res_length= addon_length;
else
{
res_length= ref_length;
/*
The reference to the record is considered
as an additional sorted field
*/
sort_length+= ref_length;
}
rec_length= sort_length + addon_length;
max_rows= maxrows;
}
static void trace_filesort_information(Opt_trace_context *trace,
const SORT_FIELD *sortorder,
uint s_length)
{
if (!trace->is_started())
return;
Opt_trace_array trace_filesort(trace, "filesort_information");
for (; s_length-- ; sortorder++)
{
Opt_trace_object oto(trace);
oto.add_alnum("direction", sortorder->reverse ? "desc" : "asc");
if (sortorder->field)
{
if (strlen(sortorder->field->table->alias) != 0)
oto.add_utf8_table(sortorder->field->table);
else
oto.add_alnum("table", "intermediate_tmp_table");
oto.add_alnum("field", sortorder->field->field_name ?
sortorder->field->field_name : "tmp_table_column");
}
else
oto.add("expression", sortorder->item);
}
}
/**
Sort a table.
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.
Before calling filesort, one must have done
table->file->info(HA_STATUS_VARIABLE)
The result set is stored in table->io_cache or
table->record_pointers.
@param thd Current thread
@param table Table to sort
@param filesort How to sort the table
@param sort_positions Set to TRUE if we want to force sorting by position
(Needed by UPDATE/INSERT or ALTER TABLE or
when rowids are required by executor)
@param[out] examined_rows Store number of examined rows here
This is the number of found rows before
applying WHERE condition.
@param[out] found_rows Store the number of found rows here.
This is the number of found rows after
applying WHERE condition.
@note
If we sort by position (like if sort_positions is 1) filesort() will
call table->prepare_for_position().
@retval
HA_POS_ERROR Error
@retval
\# Number of rows in the result, could be less than
found_rows if LIMIT were provided.
*/
ha_rows filesort(THD *thd, TABLE *table, Filesort *filesort,
bool sort_positions, ha_rows *examined_rows,
ha_rows *found_rows)
{
int error;
ulong memory_available= thd->variables.sortbuff_size;
uint maxbuffer;
BUFFPEK *buffpek;
ha_rows num_rows= HA_POS_ERROR;
IO_CACHE tempfile, buffpek_pointers, *outfile;
Sort_param param;
bool multi_byte_charset;
Bounded_queue<uchar, uchar> pq;
Opt_trace_context * const trace= &thd->opt_trace;
SQL_SELECT *const select= filesort->select;
ha_rows max_rows= filesort->limit;
uint s_length= 0;
DBUG_ENTER("filesort");
if (!(s_length= filesort->make_sortorder()))
DBUG_RETURN(HA_POS_ERROR); /* purecov: inspected */
/*
We need a nameless wrapper, since we may be inside the "steps" of
"join_execution".
*/
Opt_trace_object trace_wrapper(trace);
trace_filesort_information(trace, filesort->sortorder, s_length);
#ifdef SKIP_DBUG_IN_FILESORT
DBUG_PUSH(""); /* No DBUG here */
#endif
Item_subselect *subselect= table->reginfo.join_tab ?
table->reginfo.join_tab->join->select_lex->master_unit()->item :
NULL;
MYSQL_FILESORT_START(table->s->db.str, table->s->table_name.str);
DEBUG_SYNC(thd, "filesort_start");
/*
Release InnoDB's adaptive hash index latch (if holding) before
running a sort.
*/
ha_release_temporary_latches(thd);
/*
Don't use table->sort in filesort as it is also used by
QUICK_INDEX_MERGE_SELECT. Work with a copy and put it back at the end
when index_merge select has finished with it.
*/
Filesort_info table_sort= table->sort;
table->sort.io_cache= NULL;
DBUG_ASSERT(table_sort.record_pointers == NULL);
outfile= table_sort.io_cache;
my_b_clear(&tempfile);
my_b_clear(&buffpek_pointers);
buffpek=0;
error= 1;
param.init_for_filesort(sortlength(thd, filesort->sortorder, s_length,
&multi_byte_charset),
table,
thd->variables.max_length_for_sort_data,
max_rows, sort_positions);
table_sort.addon_buf= 0;
table_sort.addon_length= param.addon_length;
table_sort.addon_field= param.addon_field;
table_sort.unpack= unpack_addon_fields;
if (param.addon_field &&
!(table_sort.addon_buf=
(uchar *) my_malloc(param.addon_length, MYF(MY_WME))))
goto err;
if (select && select->quick)
thd->inc_status_sort_range();
else
thd->inc_status_sort_scan();
// If number of rows is not known, use as much of sort buffer as possible.
num_rows= table->file->estimate_rows_upper_bound();
if (multi_byte_charset &&
!(param.tmp_buffer= (char*) my_malloc(param.sort_length,MYF(MY_WME))))
goto err;
if (check_if_pq_applicable(trace, ¶m, &table_sort,
table, num_rows, memory_available))
{
DBUG_PRINT("info", ("filesort PQ is applicable"));
const size_t compare_length= param.sort_length;
if (pq.init(param.max_rows,
true, // max_at_top
NULL, // compare_function
compare_length,
&make_sortkey, ¶m, table_sort.get_sort_keys()))
{
/*
If we fail to init pq, we have to give up:
out of memory means my_malloc() will call my_error().
*/
DBUG_PRINT("info", ("failed to allocate PQ"));
table_sort.free_sort_buffer();
DBUG_ASSERT(thd->is_error());
goto err;
}
// For PQ queries (with limit) we initialize all pointers.
table_sort.init_record_pointers();
filesort->using_pq= true;
}
else
{
DBUG_PRINT("info", ("filesort PQ is not applicable"));
/*
We need space for at least one record from each merge chunk, i.e.
param->max_keys_per_buffer >= MERGEBUFF2
See merge_buffers()),
memory_available must be large enough for
param->max_keys_per_buffer * (record + record pointer) bytes
(the main sort buffer, see alloc_sort_buffer()).
Hence this minimum:
*/
const ulong min_sort_memory=
max<ulong>(MIN_SORT_MEMORY,
ALIGN_SIZE(MERGEBUFF2 * (param.rec_length + sizeof(uchar*))));
/*
Cannot depend on num_rows. For external sort, space for upto MERGEBUFF2
rows is required.
*/
if (num_rows < MERGEBUFF2)
num_rows= MERGEBUFF2;
while (memory_available >= min_sort_memory)
{
ha_rows keys= memory_available / (param.rec_length + sizeof(char*));
param.max_keys_per_buffer= (uint) min(num_rows, keys);
table_sort.alloc_sort_buffer(param.max_keys_per_buffer, param.rec_length);
if (table_sort.get_sort_keys())
break;
ulong old_memory_available= memory_available;
memory_available= memory_available/4*3;
if (memory_available < min_sort_memory &&
old_memory_available > min_sort_memory)
memory_available= min_sort_memory;
}
if (memory_available < min_sort_memory)
{
my_error(ER_OUT_OF_SORTMEMORY,MYF(ME_ERROR + ME_FATALERROR));
goto err;
}
}
if (open_cached_file(&buffpek_pointers,mysql_tmpdir,TEMP_PREFIX,
DISK_BUFFER_SIZE, MYF(MY_WME)))
goto err;
param.sort_form= table;
param.end= (param.local_sortorder= filesort->sortorder) + s_length;
// New scope, because subquery execution must be traced within an array.
{
Opt_trace_array ota(trace, "filesort_execution");
num_rows= find_all_keys(¶m, select,
&table_sort,
&buffpek_pointers,
&tempfile,
pq.is_initialized() ? &pq : NULL,
found_rows);
if (num_rows == HA_POS_ERROR)
goto err;
}
maxbuffer= (uint) (my_b_tell(&buffpek_pointers)/sizeof(*buffpek));
Opt_trace_object(trace, "filesort_summary")
.add("rows", num_rows)
.add("examined_rows", param.examined_rows)
.add("number_of_tmp_files", maxbuffer)
.add("sort_buffer_size", table_sort.sort_buffer_size())
.add_alnum("sort_mode",
param.addon_field ?
"<sort_key, additional_fields>" : "<sort_key, rowid>");
if (maxbuffer == 0) // The whole set is in memory
{
if (save_index(¶m, (uint) num_rows, &table_sort))
goto err;
}
else
{
if (table_sort.buffpek && table_sort.buffpek_len < maxbuffer)
{
my_free(table_sort.buffpek);
table_sort.buffpek= 0;
}
if (!(table_sort.buffpek=
(uchar *) read_buffpek_from_file(&buffpek_pointers, maxbuffer,
table_sort.buffpek)))
goto err;
buffpek= (BUFFPEK *) table_sort.buffpek;
table_sort.buffpek_len= maxbuffer;
close_cached_file(&buffpek_pointers);
/* Open cached file if it isn't open */
if (! my_b_inited(outfile) &&
open_cached_file(outfile,mysql_tmpdir,TEMP_PREFIX,READ_RECORD_BUFFER,
MYF(MY_WME)))
goto err;
if (reinit_io_cache(outfile,WRITE_CACHE,0L,0,0))
goto err;
/*
Use also the space previously used by string pointers in sort_buffer
for temporary key storage.
*/
param.max_keys_per_buffer= table_sort.sort_buffer_size() / param.rec_length;
maxbuffer--; // Offset from 0
if (merge_many_buff(¶m,
(uchar*) table_sort.get_sort_keys(),
buffpek,&maxbuffer,
&tempfile))
goto err;
if (flush_io_cache(&tempfile) ||
reinit_io_cache(&tempfile,READ_CACHE,0L,0,0))
goto err;
if (merge_index(¶m,
(uchar*) table_sort.get_sort_keys(),
buffpek,
maxbuffer,
&tempfile,
outfile))
goto err;
}
if (num_rows > param.max_rows)
{
// If find_all_keys() produced more results than the query LIMIT.
num_rows= param.max_rows;
}
error= 0;
err:
my_free(param.tmp_buffer);
if (!subselect || !subselect->is_uncacheable())
{
table_sort.free_sort_buffer();
my_free(buffpek);
table_sort.buffpek= 0;
table_sort.buffpek_len= 0;
}
close_cached_file(&tempfile);
close_cached_file(&buffpek_pointers);
/* free resources allocated for QUICK_INDEX_MERGE_SELECT */
free_io_cache(table);
if (my_b_inited(outfile))
{
if (flush_io_cache(outfile))
error=1;
{
my_off_t save_pos=outfile->pos_in_file;
/* For following reads */
if (reinit_io_cache(outfile,READ_CACHE,0L,0,0))
error=1;
outfile->end_of_file=save_pos;
}
}
if (error)
{
int kill_errno= thd->killed_errno();
DBUG_ASSERT(thd->is_error() || kill_errno);
my_printf_error(ER_FILSORT_ABORT,
"%s: %s",
MYF(ME_ERROR + ME_WAITTANG),
ER_THD(thd, ER_FILSORT_ABORT),
kill_errno ? ((kill_errno == THD::KILL_CONNECTION &&
!shutdown_in_progress) ? ER(THD::KILL_QUERY) :
ER(kill_errno)) :
thd->get_stmt_da()->message());
if (log_warnings > 1)
{
sql_print_warning("%s, host: %s, user: %s, thread: %lu, query: %-.4096s",
ER_THD(thd, ER_FILSORT_ABORT),
thd->security_ctx->host_or_ip,
&thd->security_ctx->priv_user[0],
(ulong) thd->thread_id,
thd->query());
}
}
else
thd->inc_status_sort_rows(num_rows);
*examined_rows= param.examined_rows;
#ifdef SKIP_DBUG_IN_FILESORT
DBUG_POP(); /* Ok to DBUG */
#endif
// Assign the copy back!
table->sort= table_sort;
DBUG_PRINT("exit",
("num_rows: %ld examined_rows: %ld found_rows: %ld",
(long) num_rows, (long) *examined_rows, (long) *found_rows));
MYSQL_FILESORT_DONE(error, num_rows);
DBUG_RETURN(error ? HA_POS_ERROR : num_rows);
} /* filesort */
void filesort_free_buffers(TABLE *table, bool full)
{
DBUG_ENTER("filesort_free_buffers");
my_free(table->sort.record_pointers);
table->sort.record_pointers= NULL;
if (full)
{
table->sort.free_sort_buffer();
my_free(table->sort.buffpek);
table->sort.buffpek= NULL;
table->sort.buffpek_len= 0;
}
my_free(table->sort.addon_buf);
my_free(table->sort.addon_field);
table->sort.addon_buf= NULL;
table->sort.addon_field= NULL;
DBUG_VOID_RETURN;
}
void Filesort::cleanup()
{
if (select && own_select)
{
select->cleanup();
select= NULL;
}
}
uint Filesort::make_sortorder()
{
uint count;
SORT_FIELD *sort,*pos;
ORDER *ord;
DBUG_ENTER("make_sortorder");
count=0;
for (ord = order; ord; ord= ord->next)
count++;
if (!sortorder)
sortorder= (SORT_FIELD*) sql_alloc(sizeof(SORT_FIELD) * (count + 1));
pos= sort= sortorder;
if (!pos)
DBUG_RETURN(0);
for (ord= order; ord; ord= ord->next, pos++)
{
Item *const item= ord->item[0], *const real_item= item->real_item();
pos->field= 0; pos->item= 0;
if (real_item->type() == Item::FIELD_ITEM)
{
// Could be a field, or Item_direct_view_ref wrapping a field
DBUG_ASSERT(item->type() == Item::FIELD_ITEM ||
(item->type() == Item::REF_ITEM &&
static_cast<Item_ref*>(item)->ref_type() ==
Item_ref::VIEW_REF));
pos->field= static_cast<Item_field*>(real_item)->field;
}
else if (real_item->type() == Item::SUM_FUNC_ITEM &&
!real_item->const_item())
{
// Aggregate, or Item_aggregate_ref
DBUG_ASSERT(item->type() == Item::SUM_FUNC_ITEM ||
(item->type() == Item::REF_ITEM &&
static_cast<Item_ref*>(item)->ref_type() ==
Item_ref::AGGREGATE_REF));
pos->field= item->get_tmp_table_field();
}
else if (real_item->type() == Item::COPY_STR_ITEM)
{ // Blob patch
pos->item= static_cast<Item_copy*>(real_item)->get_item();
}
else
pos->item= item;
pos->reverse= (ord->direction == ORDER::ORDER_DESC);
DBUG_ASSERT(pos->field != NULL || pos->item != NULL);
}
DBUG_RETURN(count);
}
/**
Makes an array of string pointers for info->sort_keys.
@param info Filesort_info struct owning the allocated array.
@param num_records Number of records.
@param length Length of each record.
*/
/** Read 'count' number of buffer pointers into memory. */
static uchar *read_buffpek_from_file(IO_CACHE *buffpek_pointers, uint count,
uchar *buf)
{
ulong length= sizeof(BUFFPEK)*count;
uchar *tmp= buf;
DBUG_ENTER("read_buffpek_from_file");
if (count > UINT_MAX/sizeof(BUFFPEK))
return 0; /* sizeof(BUFFPEK)*count will overflow */
if (!tmp)
tmp= (uchar *)my_malloc(length, MYF(MY_WME));
if (tmp)
{
if (reinit_io_cache(buffpek_pointers,READ_CACHE,0L,0,0) ||
my_b_read(buffpek_pointers, (uchar*) tmp, length))
{
my_free(tmp);
tmp=0;
}
}
DBUG_RETURN(tmp);
}
#ifndef DBUG_OFF
/*
Print a text, SQL-like record representation into dbug trace.
Note: this function is a work in progress: at the moment
- column read bitmap is ignored (can print garbage for unused columns)
- there is no quoting
*/
static void dbug_print_record(TABLE *table, bool print_rowid)
{
char buff[1024];
Field **pfield;
String tmp(buff,sizeof(buff),&my_charset_bin);
DBUG_LOCK_FILE;
fprintf(DBUG_FILE, "record (");
for (pfield= table->field; *pfield ; pfield++)
fprintf(DBUG_FILE, "%s%s", (*pfield)->field_name, (pfield[1])? ", ":"");
fprintf(DBUG_FILE, ") = ");
fprintf(DBUG_FILE, "(");
for (pfield= table->field; *pfield ; pfield++)
{
Field *field= *pfield;
if (field->is_null())
fwrite("NULL", sizeof(char), 4, DBUG_FILE);
if (field->type() == MYSQL_TYPE_BIT)
(void) field->val_int_as_str(&tmp, 1);
else
field->val_str(&tmp);
fwrite(tmp.ptr(),sizeof(char),tmp.length(),DBUG_FILE);
if (pfield[1])
fwrite(", ", sizeof(char), 2, DBUG_FILE);
}
fprintf(DBUG_FILE, ")");
if (print_rowid)
{
fprintf(DBUG_FILE, " rowid ");
for (uint i=0; i < table->file->ref_length; i++)
{
fprintf(DBUG_FILE, "%x", (uchar)table->file->ref[i]);
}
}
fprintf(DBUG_FILE, "\n");
DBUG_UNLOCK_FILE;
}
#endif
/**
Search after sort_keys, and write them into tempfile
(if we run out of space in the sort_keys buffer).
All produced sequences are guaranteed to be non-empty.
@param param Sorting parameter
@param select Use this to get source data
@param sort_keys Array of pointers to sort key + addon buffers.
@param buffpek_pointers File to write BUFFPEKs describing sorted segments
in tempfile.
@param tempfile File to write sorted sequences of sortkeys to.
@param pq If !NULL, use it for keeping top N elements
@param [out] found_rows The number of FOUND_ROWS().
For a query with LIMIT, this value will typically
be larger than the function return value.
@note
Basic idea:
@verbatim
while (get_next_sortkey())
{
if (using priority queue)
push sort key into queue
else
{
if (no free space in sort_keys buffers)
{
sort sort_keys buffer;
dump sorted sequence to 'tempfile';
dump BUFFPEK describing sequence location into 'buffpek_pointers';
}
put sort key into 'sort_keys';
}
}
if (sort_keys has some elements && dumped at least once)
sort-dump-dump as above;
else
don't sort, leave sort_keys array to be sorted by caller.
@endverbatim
@retval
Number of records written on success.
@retval
HA_POS_ERROR on error.
*/
static ha_rows find_all_keys(Sort_param *param, SQL_SELECT *select,
Filesort_info *fs_info,
IO_CACHE *buffpek_pointers,
IO_CACHE *tempfile,
Bounded_queue<uchar, uchar> *pq,
ha_rows *found_rows)
{
int error,flag,quick_select;
uint idx,indexpos,ref_length;
uchar *ref_pos,*next_pos,ref_buff[MAX_REFLENGTH];
my_off_t record;
TABLE *sort_form;
THD *thd= current_thd;
volatile THD::killed_state *killed= &thd->killed;
handler *file;
MY_BITMAP *save_read_set, *save_write_set;
bool skip_record;
DBUG_ENTER("find_all_keys");
DBUG_PRINT("info",("using: %s",
(select ? select->quick ? "ranges" : "where":
"every row")));
idx=indexpos=0;
error=quick_select=0;
sort_form=param->sort_form;
file=sort_form->file;
ref_length=param->ref_length;
ref_pos= ref_buff;
quick_select=select && select->quick;
record=0;
*found_rows= 0;
flag= ((file->ha_table_flags() & HA_REC_NOT_IN_SEQ) || quick_select);
if (flag)
ref_pos= &file->ref[0];
next_pos=ref_pos;
if (!quick_select)
{
next_pos=(uchar*) 0; /* Find records in sequence */
DBUG_EXECUTE_IF("bug14365043_1",
DBUG_SET("+d,ha_rnd_init_fail"););
if ((error= file->ha_rnd_init(1)))
{
file->print_error(error, MYF(0));
DBUG_RETURN(HA_POS_ERROR);
}
file->extra_opt(HA_EXTRA_CACHE,
current_thd->variables.read_buff_size);
}
if (quick_select)
{
if (select->quick->reset())
DBUG_RETURN(HA_POS_ERROR);
}
/* Remember original bitmaps */
save_read_set= sort_form->read_set;
save_write_set= sort_form->write_set;
/* Set up temporary column read map for columns used by sort */
bitmap_clear_all(&sort_form->tmp_set);
/* Temporary set for register_used_fields and register_field_in_read_map */
sort_form->read_set= &sort_form->tmp_set;
// Include fields used for sorting in the read_set.
register_used_fields(param);
// Include fields used by conditions in the read_set.
if (select && select->cond)
select->cond->walk(&Item::register_field_in_read_map, 1,
(uchar*) sort_form);
// Include fields used by pushed conditions in the read_set.
if (select && select->icp_cond)
select->icp_cond->walk(&Item::register_field_in_read_map, 1,
(uchar*) sort_form);
sort_form->column_bitmaps_set(&sort_form->tmp_set, &sort_form->tmp_set);
DEBUG_SYNC(thd, "after_index_merge_phase1");
for (;;)
{
if (quick_select)
{
if ((error= select->quick->get_next()))
break;
file->position(sort_form->record[0]);
DBUG_EXECUTE_IF("debug_filesort", dbug_print_record(sort_form, TRUE););
}
else /* Not quick-select */
{
{
error= file->ha_rnd_next(sort_form->record[0]);
if (!flag)
{
my_store_ptr(ref_pos,ref_length,record); // Position to row
record+= sort_form->s->db_record_offset;
}
else if (!error)
file->position(sort_form->record[0]);
}
if (error && error != HA_ERR_RECORD_DELETED)
break;
}
if (*killed)
{
DBUG_PRINT("info",("Sort killed by user"));
if (!quick_select)
{
(void) file->extra(HA_EXTRA_NO_CACHE);
file->ha_rnd_end();
}
DBUG_RETURN(HA_POS_ERROR); /* purecov: inspected */
}
if (error == 0)
param->examined_rows++;
if (!error && (!select ||
(!select->skip_record(thd, &skip_record) && !skip_record)))
{
++(*found_rows);
if (pq)
{
pq->push(ref_pos);
idx= pq->num_elements();
}
else
{
if (idx == param->max_keys_per_buffer)
{
if (write_keys(param, fs_info, idx, buffpek_pointers, tempfile))
DBUG_RETURN(HA_POS_ERROR);
idx= 0;
indexpos++;
}
make_sortkey(param, fs_info->get_record_buffer(idx++), ref_pos);
}
}
/*
Don't try unlocking the row if skip_record reported an error since in
this case the transaction might have been rolled back already.
*/
else if (!thd->is_error())
file->unlock_row();
/* It does not make sense to read more keys in case of a fatal error */
if (thd->is_error())
break;
}
if (!quick_select)
{
(void) file->extra(HA_EXTRA_NO_CACHE); /* End cacheing of records */
if (!next_pos)
file->ha_rnd_end();
}
if (thd->is_error())
DBUG_RETURN(HA_POS_ERROR);
/* Signal we should use orignal column read and write maps */
sort_form->column_bitmaps_set(save_read_set, save_write_set);
DBUG_PRINT("test",("error: %d indexpos: %d",error,indexpos));
if (error != HA_ERR_END_OF_FILE)
{
file->print_error(error,MYF(ME_ERROR | ME_WAITTANG)); // purecov: inspected
DBUG_RETURN(HA_POS_ERROR); /* purecov: inspected */
}
if (indexpos && idx &&
write_keys(param, fs_info, idx, buffpek_pointers, tempfile))
DBUG_RETURN(HA_POS_ERROR); /* purecov: inspected */
const ha_rows retval=
my_b_inited(tempfile) ?
(ha_rows) (my_b_tell(tempfile)/param->rec_length) : idx;
DBUG_PRINT("info", ("find_all_keys return %u", (uint) retval));
DBUG_RETURN(retval);
} /* find_all_keys */
/**
@details
Sort the buffer and write:
-# the sorted sequence to tempfile
-# a BUFFPEK describing the sorted sequence position to buffpek_pointers
(was: Skriver en buffert med nycklar till filen)
@param param Sort parameters
@param sort_keys Array of pointers to keys to sort
@param count Number of elements in sort_keys array
@param buffpek_pointers One 'BUFFPEK' struct will be written into this file.
The BUFFPEK::{file_pos, count} will indicate where
the sorted data was stored.
@param tempfile The sorted sequence will be written into this file.
@retval
0 OK
@retval
1 Error
*/
static int
write_keys(Sort_param *param, Filesort_info *fs_info, uint count,
IO_CACHE *buffpek_pointers, IO_CACHE *tempfile)
{
size_t rec_length;
uchar **end;
BUFFPEK buffpek;
DBUG_ENTER("write_keys");
rec_length= param->rec_length;
uchar **sort_keys= fs_info->get_sort_keys();
fs_info->sort_buffer(param, count);
if (!my_b_inited(tempfile) &&
open_cached_file(tempfile, mysql_tmpdir, TEMP_PREFIX, DISK_BUFFER_SIZE,
MYF(MY_WME)))
goto err; /* purecov: inspected */
/* check we won't have more buffpeks than we can possibly keep in memory */
if (my_b_tell(buffpek_pointers) + sizeof(BUFFPEK) > (ulonglong)UINT_MAX)
goto err;
buffpek.file_pos= my_b_tell(tempfile);
if ((ha_rows) count > param->max_rows)
count=(uint) param->max_rows; /* purecov: inspected */
buffpek.count=(ha_rows) count;
for (end=sort_keys+count ; sort_keys != end ; sort_keys++)
if (my_b_write(tempfile, (uchar*) *sort_keys, (uint) rec_length))
goto err;
if (my_b_write(buffpek_pointers, (uchar*) &buffpek, sizeof(buffpek)))
goto err;
DBUG_RETURN(0);
err:
DBUG_RETURN(1);
} /* write_keys */
/**
Store length as suffix in high-byte-first order.
*/
static inline void store_length(uchar *to, uint length, uint pack_length)
{
switch (pack_length) {
case 1:
*to= (uchar) length;
break;
case 2:
mi_int2store(to, length);
break;
case 3:
mi_int3store(to, length);
break;
default:
mi_int4store(to, length);
break;
}
}
#ifdef WORDS_BIGENDIAN
const bool Is_big_endian= true;
#else
const bool Is_big_endian= false;
#endif
void copy_native_longlong(uchar *to, int to_length,
longlong val, bool is_unsigned)
{
copy_integer<Is_big_endian>(to, to_length,
static_cast<uchar*>(static_cast<void*>(&val)),
sizeof(longlong),
is_unsigned);
}
/** Make a sort-key from record. */
void make_sortkey(Sort_param *param, uchar *to, uchar *ref_pos)
{
SORT_FIELD *sort_field;
for (sort_field= param->local_sortorder ;
sort_field != param->end ;
sort_field++)
{
bool maybe_null= false;
if (sort_field->field)
{
Field *field= sort_field->field;
if (field->maybe_null())
{
if (field->is_null())
{
if (sort_field->reverse)
memset(to, 255, sort_field->length+1);
else
memset(to, 0, sort_field->length+1);
to+= sort_field->length+1;
continue;
}
else
*to++=1;