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item_cmpfunc.h, opt_range.cc:

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Added inequality predicate to range optimization


sql/opt_range.cc:
  Added inequality predicate to range optimization
sql/item_cmpfunc.h:
  Added inequality predicate to range optimization
This commit is contained in:
unknown
2003-06-30 09:52:30 -07:00
parent 637607f006
commit 42817571dc
2 changed files with 16 additions and 1 deletions
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2
sql/item_cmpfunc.h
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@@ -238,7 +238,7 @@ public:
longlong val_int();
enum Functype functype() const { return NE_FUNC; }
cond_result eq_cmp_result() const { return COND_FALSE; }
optimize_type select_optimize() const { return OPTIMIZE_NONE; }
optimize_type select_optimize() const { return OPTIMIZE_KEY; }
const char *func_name() const { return "<>"; }
};

15
sql/opt_range.cc
View File

@@ -880,10 +880,17 @@ static SEL_TREE *
get_mm_parts(PARAM *param,Field *field, Item_func::Functype type,Item *value,
Item_result cmp_type)
{
bool ne_func= FALSE;
DBUG_ENTER("get_mm_parts");
if (field->table != param->table)
DBUG_RETURN(0);
if (type == Item_func::NE_FUNC)
{
ne_func= TRUE;
type= Item_func::LT_FUNC;
}
KEY_PART *key_part = param->key_parts,*end=param->key_parts_end;
SEL_TREE *tree=0;
if (value &&
@@ -913,6 +920,14 @@ get_mm_parts(PARAM *param,Field *field, Item_func::Functype type,Item *value,
tree->keys[key_part->key]=sel_add(tree->keys[key_part->key],sel_arg);
}
}
if (ne_func)
{
SEL_TREE *tree2= get_mm_parts(param, field, Item_func::GT_FUNC,
value, cmp_type);
if (tree2)
tree= tree=tree_or(param,tree,tree2);
}
DBUG_RETURN(tree);
}