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mariadb
Commit b2c904ec authored by unknown's avatar unknown
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Fixing that 3.23 API / clients do not disconnect if a large 

packet is issued.



BitKeeper/deleted/.del-net.c~ef21d6402bb882f9:
  Delete: libmysql/net.c
sql/sql_select.cc:
  reversing a fix, but we shall yet see about this one ...
parent 4c239771
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Showing with 35 additions and 696 deletions
libmysql/libmysql.c
View file @ b2c904ec
......@@ -456,14 +456,23 @@ simple_command(MYSQL *mysql,enum enum_server_command command, const char *arg,
length ? length : (ulong) strlen(arg)))
{
DBUG_PRINT("error",("Can't send command to server. Error: %d",socket_errno));
end_server(mysql);
if (mysql_reconnect(mysql) ||
net_write_command(net,(uchar) command,arg,
length ? length : (ulong) strlen(arg)))
if (net->last_errno == ER_NET_PACKET_TOO_LARGE)
{
net->last_errno=CR_SERVER_GONE_ERROR;
net->last_errno=CR_NET_PACKET_TOO_LARGE;
strmov(net->last_error,ER(net->last_errno));
goto end;
return(packet_error);
}
else
{
end_server(mysql);
if (mysql_reconnect(mysql) ||
net_write_command(net,(uchar) command,arg,
length ? length : (ulong) strlen(arg)))
{
net->last_errno=CR_SERVER_GONE_ERROR;
strmov(net->last_error,ER(net->last_errno));
goto end;
}
}
}
result=0;
......
libmysql/net.c deleted 100644 → 0
View file @ 4c239771
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA */
/* Write and read of logical packets to/from socket
** Writes are cached into net_buffer_length big packets.
** Read packets are reallocated dynamicly when reading big packets.
** Each logical packet has the following pre-info:
** 3 byte length & 1 byte package-number.
*/
#ifdef __WIN__
#include <winsock.h>
#endif
#include <global.h>
#include <violite.h>
#include <my_sys.h>
#include <m_string.h>
#include "mysql.h"
#include "mysqld_error.h"
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <violite.h>
#ifdef MYSQL_SERVER
ulong max_allowed_packet=65536;
extern ulong net_read_timeout,net_write_timeout;
extern uint test_flags;
#else
ulong max_allowed_packet=16*1024*1024L;
ulong net_read_timeout= NET_READ_TIMEOUT;
ulong net_write_timeout= NET_WRITE_TIMEOUT;
#endif
ulong net_buffer_length=8192; /* Default length. Enlarged if necessary */
#if !defined(__WIN__) && !defined(MSDOS)
#include <sys/socket.h>
#else
#undef MYSQL_SERVER /* Win32 can't handle interrupts */
#endif
#if !defined(MSDOS) && !defined(__WIN__) && !defined(HAVE_BROKEN_NETINET_INCLUDES) && !defined(__BEOS__)
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#if !defined(alpha_linux_port)
#include <netinet/tcp.h>
#endif
#endif
#include "mysqld_error.h"
#ifdef MYSQL_SERVER
#include "my_pthread.h"
#include "thr_alarm.h"
void sql_print_error(const char *format,...);
#define RETRY_COUNT mysqld_net_retry_count
extern ulong mysqld_net_retry_count;
#else
#ifdef OS2 /* avoid name conflict */
#define thr_alarm_t thr_alarm_t_net
#define ALARM ALARM_net
#endif
typedef my_bool thr_alarm_t;
typedef my_bool ALARM;
#define thr_alarm_init(A) (*(A))=0
#define thr_alarm_in_use(A) (*(A)!= 0)
#define thr_end_alarm(A)
#define thr_alarm(A,B,C) local_thr_alarm((A),(B),(C))
inline int local_thr_alarm(my_bool *A,int B __attribute__((unused)),ALARM *C __attribute__((unused)))
{
*A=1;
return 0;
}
#define thr_got_alarm(A) 0
#define RETRY_COUNT 1
#endif
#ifdef MYSQL_SERVER
extern ulong bytes_sent, bytes_received;
extern pthread_mutex_t LOCK_bytes_sent , LOCK_bytes_received;
#else
#undef statistic_add
#define statistic_add(A,B,C)
#endif
/*
** Give error if a too big packet is found
** The server can change this with the -O switch, but because the client
** can't normally do this the client should have a bigger max-buffer.
*/
#define TEST_BLOCKING 8
static int net_write_buff(NET *net,const char *packet,uint len);
/* Init with packet info */
int my_net_init(NET *net, Vio* vio)
{
if (!(net->buff=(uchar*) my_malloc(net_buffer_length,MYF(MY_WME))))
return 1;
if (net_buffer_length > max_allowed_packet)
max_allowed_packet=net_buffer_length;
net->buff_end=net->buff+(net->max_packet=net_buffer_length);
net->vio = vio;
net->no_send_ok = 0;
net->error=0; net->return_errno=0; net->return_status=0;
net->timeout=(uint) net_read_timeout; /* Timeout for read */
net->pkt_nr=0;
net->write_pos=net->read_pos = net->buff;
net->last_error[0]=0;
net->compress=0; net->reading_or_writing=0;
net->where_b = net->remain_in_buf=0;
net->last_errno=0;
if (vio != 0) /* If real connection */
{
net->fd = vio_fd(vio); /* For perl DBI/DBD */
#if defined(MYSQL_SERVER) && !defined(___WIN__) && !defined(__EMX__) && !defined(OS2)
if (!(test_flags & TEST_BLOCKING))
vio_blocking(vio, FALSE);
#endif
vio_fastsend(vio);
}
return 0;
}
void net_end(NET *net)
{
my_free((gptr) net->buff,MYF(MY_ALLOW_ZERO_PTR));
net->buff=0;
}
/* Realloc the packet buffer */
static my_bool net_realloc(NET *net, ulong length)
{
uchar *buff;
ulong pkt_length;
if (length >= max_allowed_packet)
{
DBUG_PRINT("error",("Packet too large (%lu)", length));
net->error=1;
net->last_errno=ER_NET_PACKET_TOO_LARGE;
return 1;
}
pkt_length = (length+IO_SIZE-1) & ~(IO_SIZE-1);
if (!(buff=(uchar*) my_realloc((char*) net->buff, pkt_length, MYF(MY_WME))))
{
net->error=1;
#ifdef MYSQL_SERVER
net->last_errno=ER_OUT_OF_RESOURCES;
#endif
return 1;
}
net->buff=net->write_pos=buff;
net->buff_end=buff+(net->max_packet=pkt_length);
return 0;
}
/* Remove unwanted characters from connection */
void net_clear(NET *net)
{
#ifndef EXTRA_DEBUG
int count;
bool is_blocking=vio_is_blocking(net->vio);
if (is_blocking)
vio_blocking(net->vio, FALSE);
if (!vio_is_blocking(net->vio)) /* Safety if SSL */
{
while ( (count = vio_read(net->vio, (char*) (net->buff),
net->max_packet)) > 0)
DBUG_PRINT("info",("skipped %d bytes from file: %s",
count,vio_description(net->vio)));
if (is_blocking)
vio_blocking(net->vio, TRUE);
}
#endif /* EXTRA_DEBUG */
net->pkt_nr=0; /* Ready for new command */
net->write_pos=net->buff;
}
/* Flush write_buffer if not empty. */
int net_flush(NET *net)
{
int error=0;
DBUG_ENTER("net_flush");
if (net->buff != net->write_pos)
{
error=net_real_write(net,(char*) net->buff,
(uint) (net->write_pos - net->buff));
net->write_pos=net->buff;
}
DBUG_RETURN(error);
}
/*****************************************************************************
** Write something to server/client buffer
*****************************************************************************/
/*
** Write a logical packet with packet header
** Format: Packet length (3 bytes), packet number(1 byte)
** When compression is used a 3 byte compression length is added
** NOTE: If compression is used the original package is destroyed!
*/
int
my_net_write(NET *net,const char *packet,ulong len)
{
uchar buff[NET_HEADER_SIZE];
int3store(buff,len);
buff[3]= (net->compress) ? 0 : (uchar) (net->pkt_nr++);
if (net_write_buff(net,(char*) buff,NET_HEADER_SIZE))
return 1;
return net_write_buff(net,packet,len);
}
int
net_write_command(NET *net,uchar command,const char *packet,ulong len)
{
uchar buff[NET_HEADER_SIZE+1];
uint length=len+1; /* 1 extra byte for command */
int3store(buff,length);
buff[3]= (net->compress) ? 0 : (uchar) (net->pkt_nr++);
buff[4]=command;
if (net_write_buff(net,(char*) buff,5))
return 1;
return test(net_write_buff(net,packet,len) || net_flush(net));
}
static int
net_write_buff(NET *net,const char *packet,uint len)
{
uint left_length=(uint) (net->buff_end - net->write_pos);
while (len > left_length)
{
memcpy((char*) net->write_pos,packet,left_length);
if (net_real_write(net,(char*) net->buff,net->max_packet))
return 1;
net->write_pos=net->buff;
packet+=left_length;
len-=left_length;
left_length=net->max_packet;
}
memcpy((char*) net->write_pos,packet,len);
net->write_pos+=len;
return 0;
}
/* Read and write using timeouts */
int
net_real_write(NET *net,const char *packet,ulong len)
{
int length;
char *pos,*end;
thr_alarm_t alarmed;
#if !defined(__WIN__) && !defined(__EMX__) && !defined(OS2)
ALARM alarm_buff;
#endif
uint retry_count=0;
my_bool net_blocking = vio_is_blocking(net->vio);
DBUG_ENTER("net_real_write");
if (net->error == 2)
DBUG_RETURN(-1); /* socket can't be used */
net->reading_or_writing=2;
#ifdef HAVE_COMPRESS
if (net->compress)
{
ulong complen;
uchar *b;
uint header_length=NET_HEADER_SIZE+COMP_HEADER_SIZE;
if (!(b=(uchar*) my_malloc(len + NET_HEADER_SIZE + COMP_HEADER_SIZE,
MYF(MY_WME))))
{
#ifdef MYSQL_SERVER
net->last_errno=ER_OUT_OF_RESOURCES;
net->error=2;
#endif
net->reading_or_writing=0;
DBUG_RETURN(1);
}
memcpy(b+header_length,packet,len);
if (my_compress((byte*) b+header_length,&len,&complen))
{
DBUG_PRINT("warning",
("Compression error; Continuing without compression"));
complen=0;
}
int3store(&b[NET_HEADER_SIZE],complen);
int3store(b,len);
b[3]=(uchar) (net->pkt_nr++);
len+= header_length;
packet= (char*) b;
}
#endif /* HAVE_COMPRESS */
/* DBUG_DUMP("net",packet,len); */
#ifdef MYSQL_SERVER
thr_alarm_init(&alarmed);
if (net_blocking)
thr_alarm(&alarmed,(uint) net_write_timeout,&alarm_buff);
#else
alarmed=0;
#endif /* MYSQL_SERVER */
pos=(char*) packet; end=pos+len;
while (pos != end)
{
if ((int) (length=vio_write(net->vio,pos,(int) (end-pos))) <= 0)
{
my_bool interrupted = vio_should_retry(net->vio);
#if (!defined(__WIN__) && !defined(__EMX__) && !defined(OS2))
if ((interrupted || length==0) && !thr_alarm_in_use(&alarmed))
{
if (!thr_alarm(&alarmed,(uint) net_write_timeout,&alarm_buff))
{ /* Always true for client */
if (!vio_is_blocking(net->vio))
{
while (vio_blocking(net->vio, TRUE) < 0)
{
if (vio_should_retry(net->vio) && retry_count++ < RETRY_COUNT)
continue;
#ifdef EXTRA_DEBUG
fprintf(stderr,
"%s: my_net_write: fcntl returned error %d, aborting thread\n",
my_progname,vio_errno(net->vio));
#endif /* EXTRA_DEBUG */
net->error=2; /* Close socket */
goto end;
}
}
retry_count=0;
continue;
}
}
else
#endif /* (!defined(__WIN__) && !defined(__EMX__)) */
if (thr_alarm_in_use(&alarmed) && !thr_got_alarm(&alarmed) &&
interrupted)
{
if (retry_count++ < RETRY_COUNT)
continue;
#ifdef EXTRA_DEBUG
fprintf(stderr, "%s: write looped, aborting thread\n",
my_progname);
#endif /* EXTRA_DEBUG */
}
#if defined(THREAD_SAFE_CLIENT) && !defined(MYSQL_SERVER)
if (vio_errno(net->vio) == SOCKET_EINTR)
{
DBUG_PRINT("warning",("Interrupted write. Retrying..."));
continue;
}
#endif /* defined(THREAD_SAFE_CLIENT) && !defined(MYSQL_SERVER) */
net->error=2; /* Close socket */
#ifdef MYSQL_SERVER
net->last_errno= (interrupted ? ER_NET_WRITE_INTERRUPTED :
ER_NET_ERROR_ON_WRITE);
#endif /* MYSQL_SERVER */
break;
}
pos+=length;
statistic_add(bytes_sent,length,&LOCK_bytes_sent);
}
#ifndef __WIN__
end:
#endif
#ifdef HAVE_COMPRESS
if (net->compress)
my_free((char*) packet,MYF(0));
#endif
if (thr_alarm_in_use(&alarmed))
{
thr_end_alarm(&alarmed);
vio_blocking(net->vio, net_blocking);
}
net->reading_or_writing=0;
DBUG_RETURN(((int) (pos != end)));
}
/*****************************************************************************
** Read something from server/clinet
*****************************************************************************/
#ifdef MYSQL_SERVER
/*
Help function to clear the commuication buffer when we get a too
big packet
*/
static void my_net_skip_rest(NET *net, ulong remain, thr_alarm_t *alarmed)
{
ALARM alarm_buff;
uint retry_count=0;
if (!thr_alarm_in_use(&alarmed))
{
if (!thr_alarm(alarmed,net->timeout,&alarm_buff) ||
(!vio_is_blocking(net->vio) && vio_blocking(net->vio,TRUE) < 0))
return; /* Can't setup, abort */
}
while (remain > 0)
{
ulong length;
if ((int) (length=vio_read(net->vio,(char*) net->buff,remain)) <= 0L)
{
my_bool interrupted = vio_should_retry(net->vio);
if (!thr_got_alarm(alarmed) && interrupted)
{ /* Probably in MIT threads */
if (retry_count++ < RETRY_COUNT)
continue;
}
return;
}
remain -=(ulong) length;
statistic_add(bytes_received,(ulong) length,&LOCK_bytes_received);
}
}
#endif /* MYSQL_SERVER */
static uint
my_real_read(NET *net, ulong *complen)
{
uchar *pos;
long length;
uint i,retry_count=0;
ulong len=packet_error;
thr_alarm_t alarmed;
#if (!defined(__WIN__) && !defined(__EMX__) && !defined(OS2)) || defined(MYSQL_SERVER)
ALARM alarm_buff;
#endif
my_bool net_blocking=vio_is_blocking(net->vio);
ulong remain= (net->compress ? NET_HEADER_SIZE+COMP_HEADER_SIZE :
NET_HEADER_SIZE);
*complen = 0;
net->reading_or_writing=1;
thr_alarm_init(&alarmed);
#ifdef MYSQL_SERVER
if (net_blocking)
thr_alarm(&alarmed,net->timeout,&alarm_buff);
#endif /* MYSQL_SERVER */
pos = net->buff + net->where_b; /* net->packet -4 */
for (i=0 ; i < 2 ; i++)
{
while (remain > 0)
{
/* First read is done with non blocking mode */
if ((int) (length=vio_read(net->vio,(char*) pos,remain)) <= 0L)
{
my_bool interrupted = vio_should_retry(net->vio);
DBUG_PRINT("info",("vio_read returned %d, errno: %d",
length, vio_errno(net->vio)));
#if (!defined(__WIN__) && !defined(__EMX__) && !defined(OS2)) || defined(MYSQL_SERVER)
/*
We got an error that there was no data on the socket. We now set up
an alarm to not 'read forever', change the socket to non blocking
mode and try again
*/
if ((interrupted || length == 0) && !thr_alarm_in_use(&alarmed))
{
if (!thr_alarm(&alarmed,net->timeout,&alarm_buff)) /* Don't wait too long */
{
if (!vio_is_blocking(net->vio))
{
while (vio_blocking(net->vio,TRUE) < 0)
{
if (vio_should_retry(net->vio) &&
retry_count++ < RETRY_COUNT)
continue;
DBUG_PRINT("error",
("fcntl returned error %d, aborting thread",
vio_errno(net->vio)));
#ifdef EXTRA_DEBUG
fprintf(stderr,
"%s: read: fcntl returned error %d, aborting thread\n",
my_progname,vio_errno(net->vio));
#endif /* EXTRA_DEBUG */
len= packet_error;
net->error=2; /* Close socket */
#ifdef MYSQL_SERVER
net->last_errno=ER_NET_FCNTL_ERROR;
#endif
goto end;
}
}
retry_count=0;
continue;
}
}
#endif /* (!defined(__WIN__) && !defined(__EMX__)) || defined(MYSQL_SERVER) */
if (thr_alarm_in_use(&alarmed) && !thr_got_alarm(&alarmed) &&
interrupted)
{ /* Probably in MIT threads */
if (retry_count++ < RETRY_COUNT)
continue;
#ifdef EXTRA_DEBUG
fprintf(stderr, "%s: read looped with error %d, aborting thread\n",
my_progname,vio_errno(net->vio));
#endif /* EXTRA_DEBUG */
}
#if defined(THREAD_SAFE_CLIENT) && !defined(MYSQL_SERVER)
if (vio_should_retry(net->vio))
{
DBUG_PRINT("warning",("Interrupted read. Retrying..."));
continue;
}
#endif
DBUG_PRINT("error",("Couldn't read packet: remain: %d errno: %d length: %d alarmed: %d", remain,vio_errno(net->vio),length,alarmed));
len= packet_error;
net->error=2; /* Close socket */
#ifdef MYSQL_SERVER
net->last_errno= (interrupted ? ER_NET_READ_INTERRUPTED :
ER_NET_READ_ERROR);
#endif
goto end;
}
remain -= (ulong) length;
pos+= (ulong) length;
statistic_add(bytes_received,(ulong) length,&LOCK_bytes_received);
}
if (i == 0)
{ /* First parts is packet length */
ulong helping;
if (net->buff[net->where_b + 3] != (uchar) net->pkt_nr)
{
if (net->buff[net->where_b] != (uchar) 255)
{
DBUG_PRINT("error",
("Packets out of order (Found: %d, expected %d)",
(int) net->buff[net->where_b + 3],
(uint) (uchar) net->pkt_nr));
#ifdef EXTRA_DEBUG
fprintf(stderr,"Packets out of order (Found: %d, expected %d)\n",
(int) net->buff[net->where_b + 3],
(uint) (uchar) net->pkt_nr);
#endif
}
len= packet_error;
#ifdef MYSQL_SERVER
net->last_errno=ER_NET_PACKETS_OUT_OF_ORDER;
#endif
goto end;
}
net->pkt_nr++;
#ifdef HAVE_COMPRESS
if (net->compress)
{
/* complen is > 0 if package is really compressed */
*complen=uint3korr(&(net->buff[net->where_b + NET_HEADER_SIZE]));
}
#endif
len=uint3korr(net->buff+net->where_b);
helping = max(len,*complen) + net->where_b;
/* The necessary size of net->buff */
if (helping >= net->max_packet)
{
/* We must allocate one extra byte for the end null */
if (net_realloc(net,helping+1))
{
#ifdef MYSQL_SERVER
if (i == 1)
my_net_skip_rest(net, len, &alarmed);
#endif
len= packet_error; /* Return error */
goto end;
}
}
pos=net->buff + net->where_b;
remain = len;
}
}
end:
if (thr_alarm_in_use(&alarmed))
{
thr_end_alarm(&alarmed);
vio_blocking(net->vio, net_blocking);
}
net->reading_or_writing=0;
return(len);
}
uint
my_net_read(NET *net)
{
ulong len,complen;
#ifdef HAVE_COMPRESS
if (!net->compress)
{
#endif
len = my_real_read (net,&complen);
net->read_pos = net->buff + net->where_b;
if (len != packet_error)
net->read_pos[len]=0; /* Safeguard for mysql_use_result */
return len;
#ifdef HAVE_COMPRESS
}
if (net->remain_in_buf)
net->buff[net->buf_length - net->remain_in_buf]=net->save_char;
for (;;)
{
if (net->remain_in_buf)
{
uchar *pos = net->buff + net->buf_length - net->remain_in_buf;
if (net->remain_in_buf >= 4)
{
net->length = uint3korr(pos);
if (net->length <= net->remain_in_buf - 4)
{
/* We have a full packet */
len=net->length;
net->remain_in_buf -= net->length + 4;
net->read_pos=pos + 4;
break; /* We have a full packet */
}
}
/* Move data down to read next data packet after current one */
if (net->buf_length != net->remain_in_buf)
{
memmove(net->buff,pos,net->remain_in_buf);
net->buf_length=net->remain_in_buf;
}
net->where_b=net->buf_length;
}
else
{
net->where_b=0;
net->buf_length=0;
}
if ((len = my_real_read(net,&complen)) == packet_error)
break;
if (my_uncompress((byte*) net->buff + net->where_b, &len, &complen))
{
len= packet_error;
net->error=2; /* caller will close socket */
#ifdef MYSQL_SERVER
net->last_errno=ER_NET_UNCOMPRESS_ERROR;
#endif
break;
}
net->buf_length+=len;
net->remain_in_buf+=len;
}
if (len != packet_error)
{
net->save_char= net->read_pos[len]; /* Must be saved */
net->read_pos[len]=0; /* Safeguard for mysql_use_result */
}
return len;
#endif
}
sql/net_serv.cc
View file @ b2c904ec
......@@ -34,13 +34,18 @@
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#ifdef MYSQL_SERVER
#include <violite.h>
#endif
#define MAX_PACKET_LENGTH (256L*256L*256L-1)
#ifdef MYSQL_SERVER
ulong max_allowed_packet=65536;
extern ulong net_read_timeout,net_write_timeout;
extern uint test_flags;
#else
ulong max_allowed_packet=16*1024*1024L-1;
ulong max_allowed_packet=MAX_PACKET_LENGTH;
ulong net_read_timeout= NET_READ_TIMEOUT;
ulong net_write_timeout= NET_WRITE_TIMEOUT;
#endif
......@@ -226,6 +231,12 @@ int
my_net_write(NET *net,const char *packet,ulong len)
{
uchar buff[NET_HEADER_SIZE];
if (len >= MAX_PACKET_LENGTH)
{
net->error=1;
net->last_errno=ER_NET_PACKET_TOO_LARGE;
return 1;
}
int3store(buff,len);
buff[3]= (net->compress) ? 0 : (uchar) (net->pkt_nr++);
if (net_write_buff(net,(char*) buff,NET_HEADER_SIZE))
......@@ -238,7 +249,12 @@ net_write_command(NET *net,uchar command,const char *packet,ulong len)
{
uchar buff[NET_HEADER_SIZE+1];
uint length=len+1; /* 1 extra byte for command */
if (length >= MAX_PACKET_LENGTH)
{
net->error=1;
net->last_errno=ER_NET_PACKET_TOO_LARGE;
return 1;
}
int3store(buff,length);
buff[3]= (net->compress) ? 0 : (uchar) (net->pkt_nr++);
buff[4]=command;
......@@ -276,7 +292,7 @@ net_real_write(NET *net,const char *packet,ulong len)
int length;
char *pos,*end;
thr_alarm_t alarmed;
#if !defined(__WIN__)
#if !defined(__WIN__) && !defined(__EMX__) && !defined(OS2)
ALARM alarm_buff;
#endif
uint retry_count=0;
......
sql/sql_select.cc
View file @ b2c904ec
......@@ -2328,8 +2328,7 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
if ((tab->keys & ~ tab->const_keys && i > 0) ||
tab->const_keys && i == join->const_tables &&
join->thd->select_limit < join->best_positions[i].records_read &&
join->tables > 1)
join->thd->select_limit < join->best_positions[i].records_read)
{
/* Join with outer join condition */
COND *orig_cond=sel->cond;
......
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