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Only mark MERGE readonly if all tables are readonly

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Optimize some queries when using LIMIT


merge/open.c:
  Only mark MERGE readonly if all tables are readonly
myisammrg/myrg_open.c:
  Only mark MERGE readonly if all tables are readonly
sql/sql_select.cc:
  Optimize some queries when using LIMIT
This commit is contained in:
unknown
2001-05-12 14:03:53 +03:00
parent dbd56fcdc5
commit e5f9ca3d75
3 changed files with 52 additions and 28 deletions
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8
merge/open.c
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@ -36,7 +36,7 @@ int mode;
int handle_locking;
{
int save_errno,i,errpos;
uint files,dir_length,length;
uint files,dir_length,length, options;
ulonglong file_offset;
char name_buff[FN_REFLEN*2],buff[FN_REFLEN],*end;
MRG_INFO info,*m_info;
@ -90,16 +90,22 @@ int handle_locking;
m_info->open_tables=(MRG_TABLE *) (m_info+1);
m_info->tables=files;
options= (uint) ~0;
for (i=files ; i-- > 0 ; )
{
m_info->open_tables[i].table=isam;
m_info->options|=isam->s->base.options;
options&=isam->s->base.options;
m_info->records+=isam->s->state.records;
m_info->del+=isam->s->state.del;
m_info->data_file_length=isam->s->state.data_file_length;
if (i)
isam=(N_INFO*) (isam->open_list.next->data);
}
/* Don't force readonly if not all tables are readonly */
if (! (options & (HA_OPTION_COMPRESS_RECORD | HA_OPTION_READ_ONLY_DATA)))
m_info->options&= ~(HA_OPTION_COMPRESS_RECORD | HA_OPTION_READ_ONLY_DATA);
/* Fix fileinfo for easyer debugging (actually set by rrnd) */
file_offset=0;
for (i=0 ; (uint) i < files ; i++)