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Fixed bug#15950: NOW() optimized away in VIEWs

Browse source 
This bug is a side-effect of bug fix #16377. NOW() is optimized in
BETWEEN to integer constants to speed up query execution. When view is being
created it saves already modified query and thus becomes wrong.

The agg_cmp_type() function now substitutes constant result DATE/TIME functions 
for their results only if the current query isn't CREATE VIEW or SHOW CREATE
VIEW.
This commit is contained in:
evgen@moonbone.local 2006-08-15 21:02:55 +04:00
parent 612c072b13
commit 8364a646a9
3 changed files with 44 additions and 20 deletions
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7
mysql-test/r/view.result
View file

@ -2850,3 +2850,10 @@ Tables_in_test
t1 t1
DROP TABLE t1; DROP TABLE t1;
DROP VIEW IF EXISTS v1; DROP VIEW IF EXISTS v1;
create table t1 (f1 datetime);
create view v1 as select * from t1 where f1 between now() and now() + interval 1 minute;
show create view v1;
View Create View
v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`f1` AS `f1` from `t1` where (`t1`.`f1` between now() and (now() + interval 1 minute))
drop view v1;
drop table t1;

9
mysql-test/t/view.test
View file

@ -2718,3 +2718,12 @@ DROP TABLE t1;
--disable_warnings --disable_warnings
DROP VIEW IF EXISTS v1; DROP VIEW IF EXISTS v1;
--enable_warnings --enable_warnings
#
# Bug #15950: NOW() optimized away in VIEWs
#
create table t1 (f1 datetime);
create view v1 as select * from t1 where f1 between now() and now() + interval 1 minute;
show create view v1;
drop view v1;
drop table t1;

48
sql/item_cmpfunc.cc
View file

@ -125,31 +125,39 @@ static void agg_cmp_type(THD *thd, Item_result *type, Item **items, uint nitems)
uchar null_byte; uchar null_byte;
Field *field= NULL; Field *field= NULL;
/* Search for date/time fields/functions */ /*
for (i= 0; i < nitems; i++) Do not convert items while creating a or showing a view in order
to store/display the original query in these cases.
*/
if (thd->lex->sql_command != SQLCOM_CREATE_VIEW &&
thd->lex->sql_command != SQLCOM_SHOW_CREATE)
{ {
if (!items[i]->result_as_longlong()) /* Search for date/time fields/functions */
for (i= 0; i < nitems; i++)
{ {
/* Do not convert anything if a string field/function is present */ if (!items[i]->result_as_longlong())
if (!items[i]->const_item() && items[i]->result_type() == STRING_RESULT)
{ {
i= nitems; /* Do not convert anything if a string field/function is present */
if (!items[i]->const_item() && items[i]->result_type() == STRING_RESULT)
{
i= nitems;
break;
}
continue;
}
if ((res= items[i]->real_item()->type()) == Item::FIELD_ITEM &&
items[i]->result_type() != INT_RESULT)
{
field= ((Item_field *)items[i]->real_item())->field;
break;
}
else if (res == Item::FUNC_ITEM)
{
field= items[i]->tmp_table_field_from_field_type(0);
if (field)
field->move_field(buff, &null_byte, 0);
break; break;
} }
continue;
}
if ((res= items[i]->real_item()->type()) == Item::FIELD_ITEM &&
items[i]->result_type() != INT_RESULT)
{
field= ((Item_field *)items[i]->real_item())->field;
break;
}
else if (res == Item::FUNC_ITEM)
{
field= items[i]->tmp_table_field_from_field_type(0);
if (field)
field->move_field(buff, &null_byte, 0);
break;
} }
} }
if (field) if (field)