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This is first cset for WL#1394 "Optimize index merge when all involved index ranges include only values with equal keys"

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The main idea is to exploit the fact that key scans for "key=const" return ordered sequences of rowids.
This commit is contained in:
sergefp@mysql.com
2004-05-13 01:38:40 +04:00
parent b2efad935b
commit a46d7542c9
28 changed files with 3720 additions and 500 deletions
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16
sql/sql_delete.cc
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@ -151,6 +151,12 @@ int mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds, SQL_LIST *order,
select= 0;
}
if (select && select->quick && select->quick->reset())
{
delete select;
free_underlaid_joins(thd, &thd->lex->select_lex);
DBUG_RETURN(-1); // This will force out message
}
init_read_record(&info,thd,table,select,1,1);
deleted=0L;
init_ftfuncs(thd, &thd->lex->select_lex, 1);
@ -250,10 +256,10 @@ cleanup:
#define MEM_STRIP_BUF_SIZE current_thd->variables.sortbuff_size
extern "C" int refposcmp2(void* arg, const void *a,const void *b)
extern "C" int refpos_order_cmp(void* arg, const void *a,const void *b)
{
/* arg is a pointer to file->ref_length */
return memcmp(a,b, *(int*) arg);
handler *file= (handler*)arg;
return file->cmp_ref((const byte*)a, (const byte*)b);
}
multi_delete::multi_delete(THD *thd_arg, TABLE_LIST *dt,
@ -317,8 +323,8 @@ multi_delete::initialize_tables(JOIN *join)
for (walk=walk->next ; walk ; walk=walk->next)
{
TABLE *table=walk->table;
*tempfiles_ptr++= new Unique (refposcmp2,
(void *) &table->file->ref_length,
*tempfiles_ptr++= new Unique (refpos_order_cmp,
(void *) table->file,
table->file->ref_length,
MEM_STRIP_BUF_SIZE);
}