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| author | unknown <evgen@moonbone.local> | 2006-05-18 00:55:28 +0400 |
|---|---|---|
| committer | unknown <evgen@moonbone.local> | 2006-05-18 00:55:28 +0400 |
| commit | 1c6beaee06a2c9aefc7d0cdefa149091504318a3 (patch) | |
| tree | 48910fb8a117df90e551cbb46930664c58ad3b21 /sql/item.h | |
| parent | ab9eadf21551e0465ac1523b82741e2fc51621ba (diff) | |
| download | mariadb-git-1c6beaee06a2c9aefc7d0cdefa149091504318a3.tar.gz | |
Fixed bug#19077: A nested materialized derived table is used before being populated.
The convert_constant_item() function converts constant items to ints on
prepare phase to optimize execution speed. In this case it tries to evaluate
subselect which contains a derived table and is contained in a derived table.
All derived tables are filled only after all derived tables are prepared.
So evaluation of subselect with derived table at the prepare phase will
return a wrong result.
A new flag with_subselect is added to the Item class. It indicates that
expression which this item represents is a subselect or contains a subselect.
It is set to 0 by default. It is set to 1 in the Item_subselect constructor
for subselects.
For Item_func and Item_cond derived classes it is set after fixing any argument
in Item_func::fix_fields() and Item_cond::fix_fields accordingly.
The convert_constant_item() function now doesn't convert a constant item
if the with_subselect flag set in it.
mysql-test/t/view.test:
Added test case for bug#19077: A nested materialized derived table is used before being populated.
mysql-test/t/subselect.test:
Added test case for bug#19077: A nested materialized derived table is used before being populated.
mysql-test/r/view.result:
Added test case for bug#19077: A nested materialized derived table is used before being populated.
mysql-test/r/subselect.result:
Added test case for bug#19077: A nested materialized derived table is used before being populated.
sql/item_subselect.cc:
Fixed bug#19077: A nested materialized derived table is used before being populated.
The Item_subselect class constructor sets new with_subselect flag to 1.
sql/item_func.cc:
Fixed bug#19077: A nested materialized derived table is used before being populated.
The Item_func::fix_fields() sets new with_subselect flag from with_subselect flags of its arguments.
sql/item_cmpfunc.cc:
Fixed bug#19077: A nested materialized derived table is used before being populated.
The convert_constant_item() function now doesn't convert a constant item
with the with_subselect flag set.
The Item_cond::fix_fields() sets new with_subselect flag from with_subselect flags of its arguments.
sql/item.cc:
Fixed bug#19077: A nested materialized derived table is used before being populated.
Set new with_subselect flag to default value - 0 in the Item constructor.
sql/item.h:
Fixed bug#19077: A nested materialized derived table is used before being populated.
A new flag with_subselect is added to the Item class. It indicates that
expression which this item represents is a subselect or contains a subselect.
It is set to 0 by default.
Diffstat (limited to 'sql/item.h')
| -rw-r--r-- | sql/item.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sql/item.h b/sql/item.h index 19a57a10720..28b1f54add7 100644 --- a/sql/item.h +++ b/sql/item.h @@ -460,6 +460,9 @@ public: my_bool is_autogenerated_name; /* indicate was name of this Item autogenerated or set by user */ DTCollation collation; + my_bool with_subselect; /* If this item is a subselect or some + of its arguments is or contains a + subselect */ // alloc & destruct is done as start of select using sql_alloc Item(); |