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Fix for bug #24117 "server crash on a FETCH with a cursor on a table which is not in the table cache"

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Problem:
When creating a temporary field for a temporary table in create_tmp_field_from_field(), a resulting field is created as an exact copy of an original one (in Field::new_field()). However, Field_enum and Field_set contain a pointer (typelib) to memory allocated in the parent table's MEM_ROOT, which under some circumstances may be deallocated later by the time a temporary table is used.

Solution:
Override the new_field() method for Field_enum and Field_set and create a separate copy of the typelib structure in there.
This commit is contained in:
kaa@polly.local
2006-12-14 20:58:07 +03:00
parent eb9dfafa65
commit 4162e009cb
6 changed files with 105 additions and 0 deletions
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sql/field.h
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@@ -1277,6 +1277,7 @@ public:
{
flags|=ENUM_FLAG;
}
Field *new_field(MEM_ROOT *root, struct st_table *new_table, bool keep_type);
enum_field_types type() const { return FIELD_TYPE_STRING; }
enum Item_result cmp_type () const { return INT_RESULT; }
enum Item_result cast_to_int_type () const { return INT_RESULT; }