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MDEV-21995 Server crashes in Item_field::real_type_handler with table value constructor

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1. Code simplification:

Item_default_value handled all these values:
a. DEFAULT(field)
b. DEFAULT
c. IGNORE
and had various conditions to distinguish (a) from (b) and from (c).

Introducing a new abstract class Item_contextually_typed_value_specification,
to handle (b) and (c), so the hierarchy now looks as follows:

Item
  Item_result_field
    Item_ident
      Item_field
        Item_default_value                      - DEFAULT(field)
  Item_contextually_typed_value_specification
    Item_default_specification                  - DEFAULT
    Item_ignore_specification                   - IGNORE

2. Introducing a new virtual method is_evaluable_expression() to
determine if an Item is:
- a normal expression, so its val_xxx()/get_date() methods can be called
- or a just an expression substitute, whose value methods cannot be called.

3. Disallowing Items that are not evalualble expressions in table value
   constructors.
This commit is contained in:
Alexander Barkov
2020-05-18 11:29:43 +04:00
parent 4869e7f4a8
commit 06fb78c6ac
8 changed files with 190 additions and 106 deletions
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3
sql/sql_tvc.cc
View File

@ -59,7 +59,8 @@ bool fix_fields_for_tvc(THD *thd, List_iterator_fast<List_item> &li)
while replacing their values to NAME_CONST()s.
So fix only those that have not been.
*/
if (item->fix_fields_if_needed(thd, 0))
if (item->fix_fields_if_needed(thd, 0) ||
item->check_is_evaluable_expression_or_error())
DBUG_RETURN(true);
}
}