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mariadb/storage/myisam/sort.c

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/* Copyright (c) 2000, 2012, Oracle and/or its affiliates.
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 */
/*
Creates a index for a database by reading keys, sorting them and outputing
them in sorted order through MI_SORT_INFO functions.
*/
#include "fulltext.h"
#if defined(__WIN__)
#include <fcntl.h>
#else
#include <stddef.h>
#endif
#include <queues.h>
/* static variables */
#undef MYF_RW
#undef DISK_BUFFER_SIZE
#define MERGEBUFF 15
#define MERGEBUFF2 31
#define MYF_RW MYF(MY_NABP | MY_WME | MY_WAIT_IF_FULL)
#define DISK_BUFFER_SIZE (IO_SIZE*16)
/*
Pointers of functions for store and read keys from temp file
*/
extern void print_error(const char *fmt,...);
/* Functions defined in this file */
static ha_rows find_all_keys(MI_SORT_PARAM *info,uint keys,
uchar **sort_keys,
DYNAMIC_ARRAY *buffpek,int *maxbuffer,
IO_CACHE *tempfile,
IO_CACHE *tempfile_for_exceptions);
static int write_keys(MI_SORT_PARAM *info,uchar **sort_keys,
uint count, BUFFPEK *buffpek,IO_CACHE *tempfile);
static int write_key(MI_SORT_PARAM *info, uchar *key,
IO_CACHE *tempfile);
static int write_index(MI_SORT_PARAM *info,uchar * *sort_keys,
uint count);
static int merge_many_buff(MI_SORT_PARAM *info,uint keys,
uchar * *sort_keys,
BUFFPEK *buffpek,int *maxbuffer,
IO_CACHE *t_file);
static uint read_to_buffer(IO_CACHE *fromfile,BUFFPEK *buffpek,
uint sort_length);
static int merge_buffers(MI_SORT_PARAM *info,uint keys,
IO_CACHE *from_file, IO_CACHE *to_file,
uchar * *sort_keys, BUFFPEK *lastbuff,
BUFFPEK *Fb, BUFFPEK *Tb);
static int merge_index(MI_SORT_PARAM *,uint,uchar **,BUFFPEK *, int,
IO_CACHE *);
static int flush_ft_buf(MI_SORT_PARAM *info);
static int write_keys_varlen(MI_SORT_PARAM *info,uchar **sort_keys,
uint count, BUFFPEK *buffpek,
IO_CACHE *tempfile);
static uint read_to_buffer_varlen(IO_CACHE *fromfile,BUFFPEK *buffpek,
uint sort_length);
static int write_merge_key(MI_SORT_PARAM *info, IO_CACHE *to_file,
uchar *key, uint sort_length, uint count);
static int write_merge_key_varlen(MI_SORT_PARAM *info,
IO_CACHE *to_file,
uchar* key, uint sort_length,
uint count);
static inline int
my_var_write(MI_SORT_PARAM *info, IO_CACHE *to_file, uchar *bufs);
/*
Sets the appropriate read and write methods for the MI_SORT_PARAM
based on the variable length key flag.
*/
static void set_sort_param_read_write(MI_SORT_PARAM *sort_param)
{
if (sort_param->keyinfo->flag & HA_VAR_LENGTH_KEY)
{
sort_param->write_keys= write_keys_varlen;
sort_param->read_to_buffer= read_to_buffer_varlen;
sort_param->write_key= write_merge_key_varlen;
}
else
{
sort_param->write_keys= write_keys;
sort_param->read_to_buffer= read_to_buffer;
sort_param->write_key= write_merge_key;
}
}
/*
Creates a index of sorted keys
SYNOPSIS
_create_index_by_sort()
info Sort parameters
no_messages Set to 1 if no output
sortbuff_size Size if sortbuffer to allocate
RESULT
0 ok
<> 0 Error
*/
int _create_index_by_sort(MI_SORT_PARAM *info,my_bool no_messages,
ulonglong sortbuff_size)
{
int error,maxbuffer,skr;
uint sort_length, keys;
ulonglong memavl, old_memavl;
DYNAMIC_ARRAY buffpek;
ha_rows records;
uchar **sort_keys;
IO_CACHE tempfile, tempfile_for_exceptions;
DBUG_ENTER("_create_index_by_sort");
DBUG_PRINT("enter",("sort_length: %d", info->key_length));
set_sort_param_read_write(info);
my_b_clear(&tempfile);
my_b_clear(&tempfile_for_exceptions);
bzero((char*) &buffpek,sizeof(buffpek));
sort_keys= (uchar **) NULL; error= 1;
maxbuffer=1;
memavl= max(sortbuff_size, MIN_SORT_BUFFER);
records= info->sort_info->max_records;
sort_length= info->key_length;
LINT_INIT(keys);
if ((memavl - sizeof(BUFFPEK)) / (sort_length + sizeof(char *)) > UINT_MAX32)
memavl= sizeof(BUFFPEK) + UINT_MAX32 * (sort_length + sizeof(char *));
while (memavl >= MIN_SORT_BUFFER)
{
if ((records < UINT_MAX32) &&
((my_off_t) (records + 1) *
(sort_length + sizeof(char*)) <= (my_off_t) memavl))
keys= (uint)records+1;
else
do
{
skr=maxbuffer;
if (memavl < sizeof(BUFFPEK)*(uint) maxbuffer ||
(keys=(memavl-sizeof(BUFFPEK)*(uint) maxbuffer)/
(sort_length+sizeof(char*))) <= 1 ||
keys < (uint) maxbuffer)
{
mi_check_print_error(info->sort_info->param,
"myisam_sort_buffer_size is too small");
my_errno= ENOMEM;
goto err;
}
}
while ((maxbuffer= (int) (records/(keys-1)+1)) != skr);
if ((sort_keys=(uchar **)my_malloc(keys*(sort_length+sizeof(char*))+
HA_FT_MAXBYTELEN, MYF(0))))
{
if (my_init_dynamic_array(&buffpek, sizeof(BUFFPEK), maxbuffer,
maxbuffer/2))
{
my_free(sort_keys);
sort_keys= 0;
}
else
break;
}
old_memavl=memavl;
if ((memavl= memavl/4*3) < MIN_SORT_BUFFER && old_memavl > MIN_SORT_BUFFER)
memavl= MIN_SORT_BUFFER;
}
if (memavl < MIN_SORT_BUFFER)
{
mi_check_print_error(info->sort_info->param,"MyISAM sort buffer too small"); /* purecov: tested */
my_errno= ENOMEM; /* purecov: tested */
goto err; /* purecov: tested */
}
(*info->lock_in_memory)(info->sort_info->param);/* Everything is allocated */
if (!no_messages)
printf(" - Searching for keys, allocating buffer for %d keys\n",keys);
if ((records=find_all_keys(info,keys,sort_keys,&buffpek,&maxbuffer,
&tempfile,&tempfile_for_exceptions))
== HA_POS_ERROR)
goto err; /* purecov: tested */
if (maxbuffer == 0)
{
if (!no_messages)
printf(" - Dumping %lu keys\n", (ulong) records);
if (write_index(info,sort_keys, (uint) records))
goto err; /* purecov: inspected */
}
else
{
keys=(keys*(sort_length+sizeof(char*)))/sort_length;
if (maxbuffer >= MERGEBUFF2)
{
if (!no_messages)
printf(" - Merging %lu keys\n", (ulong) records); /* purecov: tested */
if (merge_many_buff(info,keys,sort_keys,
dynamic_element(&buffpek,0,BUFFPEK *),&maxbuffer,&tempfile))
goto err; /* purecov: inspected */
}
if (flush_io_cache(&tempfile) ||
reinit_io_cache(&tempfile,READ_CACHE,0L,0,0))
goto err; /* purecov: inspected */
if (!no_messages)
printf(" - Last merge and dumping keys\n"); /* purecov: tested */
if (merge_index(info,keys,sort_keys,dynamic_element(&buffpek,0,BUFFPEK *),
maxbuffer,&tempfile))
goto err; /* purecov: inspected */
}
if (flush_ft_buf(info) || flush_pending_blocks(info))
goto err;
if (my_b_inited(&tempfile_for_exceptions))
{
MI_INFO *idx=info->sort_info->info;
uint keyno=info->key;
uint key_length, ref_length=idx->s->rec_reflength;
if (!no_messages)
printf(" - Adding exceptions\n"); /* purecov: tested */
if (flush_io_cache(&tempfile_for_exceptions) ||
reinit_io_cache(&tempfile_for_exceptions,READ_CACHE,0L,0,0))
goto err;
while (!my_b_read(&tempfile_for_exceptions,(uchar*)&key_length,
sizeof(key_length))
&& !my_b_read(&tempfile_for_exceptions,(uchar*)sort_keys,
(uint) key_length))
{
if (_mi_ck_write(idx,keyno,(uchar*) sort_keys,key_length-ref_length))
goto err;
}
}
error =0;
err:
my_free(sort_keys);
delete_dynamic(&buffpek);
close_cached_file(&tempfile);
close_cached_file(&tempfile_for_exceptions);
DBUG_RETURN(error ? -1 : 0);
} /* _create_index_by_sort */
/* Search after all keys and place them in a temp. file */
static ha_rows find_all_keys(MI_SORT_PARAM *info, uint keys,
uchar **sort_keys, DYNAMIC_ARRAY *buffpek,
int *maxbuffer, IO_CACHE *tempfile,
IO_CACHE *tempfile_for_exceptions)
{
int error;
uint idx;
DBUG_ENTER("find_all_keys");
idx=error=0;
sort_keys[0]=(uchar*) (sort_keys+keys);
while (!(error=(*info->key_read)(info,sort_keys[idx])))
{
if (info->real_key_length > info->key_length)
{
if (write_key(info,sort_keys[idx],tempfile_for_exceptions))
DBUG_RETURN(HA_POS_ERROR); /* purecov: inspected */
continue;
}
if (++idx == keys)
{
if (info->write_keys(info,sort_keys,idx-1,(BUFFPEK *)alloc_dynamic(buffpek),
tempfile))
DBUG_RETURN(HA_POS_ERROR); /* purecov: inspected */
sort_keys[0]=(uchar*) (sort_keys+keys);
memcpy(sort_keys[0],sort_keys[idx-1],(size_t) info->key_length);
idx=1;
}
sort_keys[idx]=sort_keys[idx-1]+info->key_length;
}
if (error > 0)
DBUG_RETURN(HA_POS_ERROR); /* Aborted by get_key */ /* purecov: inspected */
if (buffpek->elements)
{
if (info->write_keys(info,sort_keys,idx,(BUFFPEK *)alloc_dynamic(buffpek),
tempfile))
DBUG_RETURN(HA_POS_ERROR); /* purecov: inspected */
*maxbuffer=buffpek->elements-1;
}
else
*maxbuffer=0;
DBUG_RETURN((*maxbuffer)*(keys-1)+idx);
} /* find_all_keys */
static my_bool thr_find_all_keys_exec(MI_SORT_PARAM *sort_param)
{
DBUG_ENTER("thr_find_all_keys");
DBUG_PRINT("enter", ("master: %d", sort_param->master));
ulonglong memavl, old_memavl;
uint UNINIT_VAR(keys), idx;
uint sort_length;
uint maxbuffer;
uchar **sort_keys= NULL;
my_bool error= FALSE;
if (sort_param->sort_info->got_error)
error= TRUE;
if (error)
DBUG_RETURN(error);
set_sort_param_read_write(sort_param);
my_b_clear(&sort_param->tempfile);
my_b_clear(&sort_param->tempfile_for_exceptions);
bzero((char*) &sort_param->buffpek, sizeof(sort_param->buffpek));
bzero((char*) &sort_param->unique, sizeof(sort_param->unique));
memavl= max(sort_param->sortbuff_size, MIN_SORT_BUFFER);
idx= (uint) sort_param->sort_info->max_records;
sort_length= sort_param->key_length;
maxbuffer= 1;
if ((memavl - sizeof(BUFFPEK)) / (sort_length +
sizeof(char *)) > UINT_MAX32)
memavl= sizeof(BUFFPEK) + UINT_MAX32 * (sort_length + sizeof(char *));
while (memavl >= MIN_SORT_BUFFER)
{
if ((my_off_t) (idx+1)*(sort_length+sizeof(char*)) <=
(my_off_t) memavl)
keys= idx+1;
else
{
uint skr;
do
{
skr= maxbuffer;
if (memavl < sizeof(BUFFPEK)*maxbuffer ||
(keys=(memavl-sizeof(BUFFPEK)*maxbuffer)/
(sort_length+sizeof(char*))) <= 1 ||
keys < (uint) maxbuffer)
{
mi_check_print_error(sort_param->sort_info->param,
"myisam_sort_buffer_size is too small. Current "
"myisam_sort_buffer_size: %llu rows: %llu sort_length: %u",
sort_param->sortbuff_size, (ulonglong) idx, sort_length);
DBUG_RETURN(TRUE);
}
}
while ((maxbuffer= (int) (idx/(keys-1)+1)) != skr);
}
if ((sort_keys= my_malloc(keys * (sort_length + sizeof(char *)) +
((sort_param->keyinfo->flag & HA_FULLTEXT) ?
HA_FT_MAXBYTELEN : 0), MYF(0))))
{
if (my_init_dynamic_array(&sort_param->buffpek, sizeof(BUFFPEK),
maxbuffer, min(maxbuffer / 2, 1000)))
{
my_free(sort_keys);
sort_keys= NULL; /* Safety against double free on error. */
}
else
break;
}
old_memavl= memavl;
if ((memavl= memavl / 4 * 3) < MIN_SORT_BUFFER &&
old_memavl > MIN_SORT_BUFFER)
memavl= MIN_SORT_BUFFER;
}
if (memavl < MIN_SORT_BUFFER)
{
/* purecov: begin inspected */
mi_check_print_error(sort_param->sort_info->param,
"myisam_sort_buffer_size is too small. Current "
"myisam_sort_buffer_size: %llu rows: %llu sort_length: %u",
sort_param->sortbuff_size, (ulonglong) idx, sort_length);
my_errno= ENOMEM;
goto err;
/* purecov: end inspected */
}
if (sort_param->sort_info->param->testflag & T_VERBOSE)
printf("Key %d - Allocating buffer for %llu keys\n",
sort_param->key + 1, (ulonglong) keys);
sort_param->sort_keys= sort_keys;
idx= error= 0;
sort_keys[0]= (uchar*) (sort_keys+keys);
DBUG_PRINT("info", ("reading keys"));
while (!(error= sort_param->sort_info->got_error) &&
!(error= (*sort_param->key_read)(sort_param, sort_keys[idx])))
{
if (sort_param->real_key_length > sort_param->key_length)
{
if (write_key(sort_param, sort_keys[idx],
&sort_param->tempfile_for_exceptions))
goto err;
continue;
}
if (++idx == keys)
{
if (sort_param->write_keys(sort_param, sort_keys, idx - 1,
(BUFFPEK*) alloc_dynamic(&sort_param->buffpek),
&sort_param->tempfile))
goto err;
sort_keys[0]= (uchar*) (sort_keys+keys);
memcpy(sort_keys[0], sort_keys[idx - 1], (size_t) sort_param->key_length);
idx= 1;
}
sort_keys[idx]= sort_keys[idx - 1] + sort_param->key_length;
}
if (error > 0)
goto err;
if (sort_param->buffpek.elements)
{
if (sort_param->write_keys(sort_param, sort_keys, idx,
(BUFFPEK*) alloc_dynamic(&sort_param->buffpek),
&sort_param->tempfile))
goto err;
sort_param->keys= (sort_param->buffpek.elements - 1) * (keys - 1) + idx;
}
else
sort_param->keys= idx;
sort_param->sort_keys_length= keys;
DBUG_RETURN(FALSE);
err:
DBUG_PRINT("error", ("got some error"));
sort_param->sort_info->got_error= 1; /* no need to protect with a mutex */
my_free(sort_keys);
sort_param->sort_keys= 0;
delete_dynamic(& sort_param->buffpek);
close_cached_file(&sort_param->tempfile);
close_cached_file(&sort_param->tempfile_for_exceptions);
DBUG_RETURN(TRUE);
}
/* Search after all keys and place them in a temp. file */
pthread_handler_t thr_find_all_keys(void *arg)
{
MI_SORT_PARAM *sort_param= (MI_SORT_PARAM*) arg;
my_bool error= FALSE;
/* If my_thread_init fails */
if (my_thread_init() || thr_find_all_keys_exec(sort_param))
error= TRUE;
/*
Thread must clean up after itself.
*/
free_root(&sort_param->wordroot, MYF(0));
/*
Detach from the share if the writer is involved. Avoid others to
be blocked. This includes a flush of the write buffer. This will
also indicate EOF to the readers.
That means that a writer always gets here first and readers -
only when they see EOF. But if a reader finishes prematurely
because of an error it may reach this earlier - don't allow it
to detach the writer thread.
*/
if (sort_param->master && sort_param->sort_info->info->rec_cache.share)
remove_io_thread(&sort_param->sort_info->info->rec_cache);
/* Readers detach from the share if any. Avoid others to be blocked. */
if (sort_param->read_cache.share)
remove_io_thread(&sort_param->read_cache);
mysql_mutex_lock(&sort_param->sort_info->mutex);
if (error)
sort_param->sort_info->got_error= 1;
if (!--sort_param->sort_info->threads_running)
mysql_cond_signal(&sort_param->sort_info->cond);
mysql_mutex_unlock(&sort_param->sort_info->mutex);
my_thread_end();
return NULL;
}
int thr_write_keys(MI_SORT_PARAM *sort_param)
{
MI_SORT_INFO *sort_info=sort_param->sort_info;
HA_CHECK *param=sort_info->param;
ulong UNINIT_VAR(length), keys;
ulong *rec_per_key_part=param->rec_per_key_part;
int got_error=sort_info->got_error;
uint i;
MI_INFO *info=sort_info->info;
MYISAM_SHARE *share=info->s;
MI_SORT_PARAM *sinfo;
uchar *mergebuf=0;
DBUG_ENTER("thr_write_keys");
LINT_INIT(length);
for (i= 0, sinfo= sort_param ;
i < sort_info->total_keys ;
i++, sinfo++)
{
if (!sinfo->sort_keys)
{
got_error=1;
my_free(mi_get_rec_buff_ptr(info, sinfo->rec_buff));
continue;
}
if (!got_error)
{
mi_set_key_active(share->state.key_map, sinfo->key);
if (!sinfo->buffpek.elements)
{
if (param->testflag & T_VERBOSE)
{
printf("Key %d - Dumping %u keys\n",sinfo->key+1, sinfo->keys);
fflush(stdout);
}
if (write_index(sinfo, sinfo->sort_keys, sinfo->keys) ||
flush_ft_buf(sinfo) || flush_pending_blocks(sinfo))
got_error=1;
}
}
my_free(sinfo->sort_keys);
my_free(mi_get_rec_buff_ptr(info, sinfo->rec_buff));
sinfo->sort_keys=0;
}
for (i= 0, sinfo= sort_param ;
i < sort_info->total_keys ;
i++,
delete_dynamic(&sinfo->buffpek),
close_cached_file(&sinfo->tempfile),
close_cached_file(&sinfo->tempfile_for_exceptions),
rec_per_key_part+= sinfo->keyinfo->keysegs, sinfo++)
{
if (got_error)
continue;
set_sort_param_read_write(sinfo);
if (sinfo->buffpek.elements)
{
uint maxbuffer=sinfo->buffpek.elements-1;
if (!mergebuf)
{
length=param->sort_buffer_length;
while (length >= MIN_SORT_BUFFER)
{
if ((mergebuf= my_malloc(length, MYF(0))))
break;
length=length*3/4;
}
if (!mergebuf)
{
got_error=1;
continue;
}
}
keys=length/sinfo->key_length;
if (maxbuffer >= MERGEBUFF2)
{
if (param->testflag & T_VERBOSE)
printf("Key %d - Merging %u keys\n",sinfo->key+1, sinfo->keys);
if (merge_many_buff(sinfo, keys, (uchar **)mergebuf,
dynamic_element(&sinfo->buffpek, 0, BUFFPEK *),
(int*) &maxbuffer, &sinfo->tempfile))
{
got_error=1;
continue;
}
}
if (flush_io_cache(&sinfo->tempfile) ||
reinit_io_cache(&sinfo->tempfile,READ_CACHE,0L,0,0))
{
got_error=1;
continue;
}
if (param->testflag & T_VERBOSE)
printf("Key %d - Last merge and dumping keys\n", sinfo->key+1);
if (merge_index(sinfo, keys, (uchar **)mergebuf,
dynamic_element(&sinfo->buffpek,0,BUFFPEK *),
maxbuffer,&sinfo->tempfile) ||
flush_ft_buf(sinfo) ||
flush_pending_blocks(sinfo))
{
got_error=1;
continue;
}
}
if (my_b_inited(&sinfo->tempfile_for_exceptions))
{
uint key_length;
if (param->testflag & T_VERBOSE)
printf("Key %d - Dumping 'long' keys\n", sinfo->key+1);
if (flush_io_cache(&sinfo->tempfile_for_exceptions) ||
reinit_io_cache(&sinfo->tempfile_for_exceptions,READ_CACHE,0L,0,0))
{
got_error=1;
continue;
}
while (!got_error &&
!my_b_read(&sinfo->tempfile_for_exceptions,(uchar*)&key_length,
sizeof(key_length)))
{
uchar ft_buf[HA_FT_MAXBYTELEN + HA_FT_WLEN + 10];
if (key_length > sizeof(ft_buf) ||
my_b_read(&sinfo->tempfile_for_exceptions, (uchar*)ft_buf,
(uint)key_length) ||
_mi_ck_write(info, sinfo->key, (uchar*)ft_buf,
key_length - info->s->rec_reflength))
got_error=1;
}
}
if (!got_error && param->testflag & T_STATISTICS)
update_key_parts(sinfo->keyinfo, rec_per_key_part, sinfo->unique,
param->stats_method == MI_STATS_METHOD_IGNORE_NULLS ?
sinfo->notnull : NULL,
(ulonglong) info->state->records);
}
my_free(mergebuf);
DBUG_RETURN(got_error);
}
/* Write all keys in memory to file for later merge */
static int write_keys(MI_SORT_PARAM *info, register uchar **sort_keys,
uint count, BUFFPEK *buffpek, IO_CACHE *tempfile)
{
uchar **end;
uint sort_length=info->key_length;
DBUG_ENTER("write_keys");
my_qsort2((uchar*) sort_keys,count,sizeof(uchar*),(qsort2_cmp) info->key_cmp,
info);
if (!my_b_inited(tempfile) &&
open_cached_file(tempfile, my_tmpdir(info->tmpdir), "ST",
DISK_BUFFER_SIZE, info->sort_info->param->myf_rw))
DBUG_RETURN(1); /* purecov: inspected */
buffpek->file_pos=my_b_tell(tempfile);
buffpek->count=count;
for (end=sort_keys+count ; sort_keys != end ; sort_keys++)
{
if (my_b_write(tempfile,(uchar*) *sort_keys,(uint) sort_length))
DBUG_RETURN(1); /* purecov: inspected */
}
DBUG_RETURN(0);
} /* write_keys */
static inline int
my_var_write(MI_SORT_PARAM *info, IO_CACHE *to_file, uchar *bufs)
{
int err;
uint16 len = _mi_keylength(info->keyinfo, (uchar*) bufs);
/* The following is safe as this is a local file */
if ((err= my_b_write(to_file, (uchar*)&len, sizeof(len))))
return (err);
if ((err= my_b_write(to_file,bufs, (uint) len)))
return (err);
return (0);
}
static int write_keys_varlen(MI_SORT_PARAM *info,
register uchar **sort_keys,
uint count, BUFFPEK *buffpek,
IO_CACHE *tempfile)
{
uchar **end;
int err;
DBUG_ENTER("write_keys_varlen");
my_qsort2((uchar*) sort_keys,count,sizeof(uchar*),(qsort2_cmp) info->key_cmp,
info);
if (!my_b_inited(tempfile) &&
open_cached_file(tempfile, my_tmpdir(info->tmpdir), "ST",
DISK_BUFFER_SIZE, info->sort_info->param->myf_rw))
DBUG_RETURN(1); /* purecov: inspected */
buffpek->file_pos=my_b_tell(tempfile);
buffpek->count=count;
for (end=sort_keys+count ; sort_keys != end ; sort_keys++)
{
if ((err= my_var_write(info,tempfile, (uchar*) *sort_keys)))
DBUG_RETURN(err);
}
DBUG_RETURN(0);
} /* write_keys_varlen */
static int write_key(MI_SORT_PARAM *info, uchar *key, IO_CACHE *tempfile)
{
uint key_length=info->real_key_length;
DBUG_ENTER("write_key");
if (!my_b_inited(tempfile) &&
open_cached_file(tempfile, my_tmpdir(info->tmpdir), "ST",
DISK_BUFFER_SIZE, info->sort_info->param->myf_rw))
DBUG_RETURN(1);
if (my_b_write(tempfile,(uchar*)&key_length,sizeof(key_length)) ||
my_b_write(tempfile,(uchar*)key,(uint) key_length))
DBUG_RETURN(1);
DBUG_RETURN(0);
} /* write_key */
/* Write index */
static int write_index(MI_SORT_PARAM *info, register uchar **sort_keys,
register uint count)
{
DBUG_ENTER("write_index");
my_qsort2((uchar*) sort_keys,(size_t) count,sizeof(uchar*),
(qsort2_cmp) info->key_cmp,info);
while (count--)
{
if ((*info->key_write)(info,*sort_keys++))
DBUG_RETURN(-1); /* purecov: inspected */
}
DBUG_RETURN(0);
} /* write_index */
/* Merge buffers to make < MERGEBUFF2 buffers */
static int merge_many_buff(MI_SORT_PARAM *info, uint keys,
uchar **sort_keys, BUFFPEK *buffpek,
int *maxbuffer, IO_CACHE *t_file)
{
register int i;
IO_CACHE t_file2, *from_file, *to_file, *temp;
BUFFPEK *lastbuff;
DBUG_ENTER("merge_many_buff");
if (*maxbuffer < MERGEBUFF2)
DBUG_RETURN(0); /* purecov: inspected */
if (flush_io_cache(t_file) ||
open_cached_file(&t_file2,my_tmpdir(info->tmpdir),"ST",
DISK_BUFFER_SIZE, info->sort_info->param->myf_rw))
DBUG_RETURN(1); /* purecov: inspected */
from_file= t_file ; to_file= &t_file2;
while (*maxbuffer >= MERGEBUFF2)
{
reinit_io_cache(from_file,READ_CACHE,0L,0,0);
reinit_io_cache(to_file,WRITE_CACHE,0L,0,0);
lastbuff=buffpek;
for (i=0 ; i <= *maxbuffer-MERGEBUFF*3/2 ; i+=MERGEBUFF)
{
if (merge_buffers(info,keys,from_file,to_file,sort_keys,lastbuff++,
buffpek+i,buffpek+i+MERGEBUFF-1))
goto cleanup;
}
if (merge_buffers(info,keys,from_file,to_file,sort_keys,lastbuff++,
buffpek+i,buffpek+ *maxbuffer))
break; /* purecov: inspected */
if (flush_io_cache(to_file))
break; /* purecov: inspected */
temp=from_file; from_file=to_file; to_file=temp;
*maxbuffer= (int) (lastbuff-buffpek)-1;
}
cleanup:
close_cached_file(to_file); /* This holds old result */
if (to_file == t_file)
{
DBUG_ASSERT(t_file2.type == WRITE_CACHE);
*t_file=t_file2; /* Copy result file */
t_file->current_pos= &t_file->write_pos;
t_file->current_end= &t_file->write_end;
}
DBUG_RETURN(*maxbuffer >= MERGEBUFF2); /* Return 1 if interrupted */
} /* merge_many_buff */
/*
Read data to buffer
SYNOPSIS
read_to_buffer()
fromfile File to read from
buffpek Where to read from
sort_length max length to read
RESULT
> 0 Ammount of bytes read
-1 Error
*/
static uint read_to_buffer(IO_CACHE *fromfile, BUFFPEK *buffpek,
uint sort_length)
{
register uint count;
uint length;
if ((count=(uint) min((ha_rows) buffpek->max_keys,buffpek->count)))
{
if (mysql_file_pread(fromfile->file, (uchar*) buffpek->base,
(length= sort_length*count),
buffpek->file_pos, MYF_RW))
return((uint) -1); /* purecov: inspected */
buffpek->key=buffpek->base;
buffpek->file_pos+= length; /* New filepos */
buffpek->count-= count;
buffpek->mem_count= count;
}
return (count*sort_length);
} /* read_to_buffer */
static uint read_to_buffer_varlen(IO_CACHE *fromfile, BUFFPEK *buffpek,
uint sort_length)
{
register uint count;
uint16 length_of_key = 0;
uint idx;
uchar *buffp;
if ((count=(uint) min((ha_rows) buffpek->max_keys,buffpek->count)))
{
buffp = buffpek->base;
for (idx=1;idx<=count;idx++)
{
if (mysql_file_pread(fromfile->file, (uchar*)&length_of_key,
sizeof(length_of_key), buffpek->file_pos, MYF_RW))
return((uint) -1);
buffpek->file_pos+=sizeof(length_of_key);
if (mysql_file_pread(fromfile->file, (uchar*) buffp,
length_of_key, buffpek->file_pos, MYF_RW))
return((uint) -1);
buffpek->file_pos+=length_of_key;
buffp = buffp + sort_length;
}
buffpek->key=buffpek->base;
buffpek->count-= count;
buffpek->mem_count= count;
}
return (count*sort_length);
} /* read_to_buffer_varlen */
static int write_merge_key_varlen(MI_SORT_PARAM *info,
IO_CACHE *to_file, uchar* key,
uint sort_length, uint count)
{
uint idx;
uchar *bufs = key;
for (idx=1;idx<=count;idx++)
{
int err;
if ((err= my_var_write(info, to_file, bufs)))
return (err);
bufs=bufs+sort_length;
}
return(0);
}
static int write_merge_key(MI_SORT_PARAM *info __attribute__((unused)),
IO_CACHE *to_file, uchar *key,
uint sort_length, uint count)
{
return my_b_write(to_file, key, (size_t) sort_length*count);
}
/*
Merge buffers to one buffer
If to_file == 0 then use info->key_write
*/
static int
merge_buffers(MI_SORT_PARAM *info, uint keys, IO_CACHE *from_file,
IO_CACHE *to_file, uchar **sort_keys, BUFFPEK *lastbuff,
BUFFPEK *Fb, BUFFPEK *Tb)
{
int error;
uint sort_length,maxcount;
ha_rows count;
my_off_t UNINIT_VAR(to_start_filepos);
uchar *strpos;
BUFFPEK *buffpek,**refpek;
QUEUE queue;
DBUG_ENTER("merge_buffers");
count=error=0;
maxcount=keys/((uint) (Tb-Fb) +1);
DBUG_ASSERT(maxcount > 0);
LINT_INIT(to_start_filepos);
if (to_file)
to_start_filepos=my_b_tell(to_file);
strpos=(uchar*) sort_keys;
sort_length=info->key_length;
if (init_queue(&queue,(uint) (Tb-Fb)+1,offsetof(BUFFPEK,key),0,
(int (*)(void*, uchar *,uchar*)) info->key_cmp,
(void*) info, 0, 0))
DBUG_RETURN(1); /* purecov: inspected */
for (buffpek= Fb ; buffpek <= Tb ; buffpek++)
{
count+= buffpek->count;
buffpek->base= (uchar*) strpos;
buffpek->max_keys=maxcount;
strpos+= (uint) (error=(int) info->read_to_buffer(from_file,buffpek,
sort_length));
if (error == -1)
goto err; /* purecov: inspected */
queue_insert(&queue,(uchar*) buffpek);
}
while (queue.elements > 1)
{
for (;;)
{
buffpek=(BUFFPEK*) queue_top(&queue);
if (to_file)
{
if (info->write_key(info,to_file,(uchar*) buffpek->key,
(uint) sort_length,1))
{
error=1; goto err; /* purecov: inspected */
}
}
else
{
if ((*info->key_write)(info,(void*) buffpek->key))
{
error=1; goto err; /* purecov: inspected */
}
}
buffpek->key+=sort_length;
if (! --buffpek->mem_count)
{
/* It's enough to check for killedptr before a slow operation */
if (killed_ptr(info->sort_info->param))
{
error=1;
goto err;
}
if (!(error=(int) info->read_to_buffer(from_file,buffpek,sort_length)))
{
uchar *base= buffpek->base;
uint max_keys=buffpek->max_keys;
queue_remove_top(&queue);
/* Put room used by buffer to use in other buffer */
for (refpek= (BUFFPEK**) &queue_top(&queue);
refpek <= (BUFFPEK**) &queue_end(&queue);
refpek++)
{
buffpek= *refpek;
if (buffpek->base+buffpek->max_keys*sort_length == base)
{
buffpek->max_keys+=max_keys;
break;
}
else if (base+max_keys*sort_length == buffpek->base)
{
buffpek->base=base;
buffpek->max_keys+=max_keys;
break;
}
}
break; /* One buffer have been removed */
}
}
else if (error == -1)
goto err; /* purecov: inspected */
queue_replace_top(&queue); /* Top element has been replaced */
}
}
buffpek=(BUFFPEK*) queue_top(&queue);
buffpek->base= (uchar*) sort_keys;
buffpek->max_keys=keys;
do
{
if (to_file)
{
if (info->write_key(info,to_file,(uchar*) buffpek->key,
sort_length,buffpek->mem_count))
{
error=1; goto err; /* purecov: inspected */
}
}
else
{
register uchar *end;
strpos= (uchar*) buffpek->key;
for (end=strpos+buffpek->mem_count*sort_length;
strpos != end ;
strpos+=sort_length)
{
if ((*info->key_write)(info,(void*) strpos))
{
error=1; goto err; /* purecov: inspected */
}
}
}
}
while ((error=(int) info->read_to_buffer(from_file,buffpek,sort_length)) != -1 &&
error != 0);
lastbuff->count=count;
if (to_file)
lastbuff->file_pos=to_start_filepos;
err:
delete_queue(&queue);
DBUG_RETURN(error);
} /* merge_buffers */
/* Do a merge to output-file (save only positions) */
static int
merge_index(MI_SORT_PARAM *info, uint keys, uchar **sort_keys,
BUFFPEK *buffpek, int maxbuffer, IO_CACHE *tempfile)
{
DBUG_ENTER("merge_index");
if (merge_buffers(info,keys,tempfile,(IO_CACHE*) 0,sort_keys,buffpek,buffpek,
buffpek+maxbuffer))
DBUG_RETURN(1); /* purecov: inspected */
DBUG_RETURN(0);
} /* merge_index */
static int
flush_ft_buf(MI_SORT_PARAM *info)
{
int err=0;
if (info->sort_info->ft_buf)
{
err=sort_ft_buf_flush(info);
my_free(info->sort_info->ft_buf);
info->sort_info->ft_buf=0;
}
return err;
}