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Bug#28763: Selecting geometry fields in UNION caused server crash.

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This bug was introduced by the fix for the bug#27300. In this fix a section
of code was added to the Item::tmp_table_field_from_field_type method.
This section intended to create Field_geom fields for the Item_geometry_func
class and its descendants. In order to get the geometry type of the current
item it casted "this" to the Item_geometry_func* type. But the
Item::tmp_table_field_from_field_type method is also used for creation of
fields for UNION and in this case this method is called for an object of the
Item_type_holder class and the cast to the Item_geometry_func* type causes 
a server crash.

Now the Item::tmp_table_field_from_field_type method correctly works when it's
called for both the Item_type_holder and the Item_geometry_func classes.
The new geometry_type variable is added to the Item_type_holder class.
The new method called get_geometry_type is added to the Item_field
and the Field classes. It returns geometry type from the field for the
Item_field and the Field_geom classes and fails an assert for other Field
descendants.
This commit is contained in:
evgen@moonbone.local
2007-06-08 00:33:03 +04:00
parent e4e141cf58
commit eb9e174bc2
5 changed files with 54 additions and 2 deletions
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13
mysql-test/t/gis.test
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@@ -557,4 +557,17 @@ SELECT Overlaps(@horiz1, @point2) FROM DUAL;
DROP TABLE t1;
#
# Bug#28763: Selecting geometry fields in UNION caused server crash.
#
create table t1(f1 geometry, f2 point, f3 linestring);
select f1 from t1 union select f1 from t1;
insert into t1 (f2,f3) values (GeomFromText('POINT(1 1)'),
GeomFromText('LINESTRING(0 0,1 1,2 2)'));
select AsText(f2),AsText(f3) from t1;
select AsText(a) from (select f2 as a from t1 union select f3 from t1) t;
create table t2 as select f2 as a from t1 union select f3 from t1;
desc t2;
select AsText(a) from t2;
drop table t1, t2;
--echo End of 5.0 tests