Details
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Bug
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Status: Open (View Workflow)
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Trivial
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Resolution: Unresolved
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10.4(EOL), 10.5, 10.6, 10.10(EOL), 10.11, 11.0(EOL), 11.1(EOL)
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None
Description
I'm not really sure how columns for views should look at all in information_schema, but it seems that at least when a column is taken from a table "as is", its attributes such as type, default etc. are generally preserved; virtual columns are an exception, as neither EXTRA nor IS_GENERATED nor GENERATION_EXPRESSION are populated, even though the column is expectedly still treated as virtual upon DML on a view.
create table t (a int, b int as (a)); |
create view v as select * from t; |
select table_name, column_name, column_type, extra, is_generated, generation_expression from information_schema.columns where column_name = 'b'; |
--error ER_WARNING_NON_DEFAULT_VALUE_FOR_GENERATED_COLUMN
|
insert into v (b) values (1); |
drop view v; |
drop table t; |
|
10.4 900c4d6920 |
+------------+-------------+-------------+-------------------+--------------+-----------------------+ |
| table_name | column_name | column_type | extra | is_generated | generation_expression |
|
+------------+-------------+-------------+-------------------+--------------+-----------------------+ |
| v | b | int(11) | | NEVER | NULL | |
| t | b | int(11) | VIRTUAL GENERATED | ALWAYS | `a` | |
+------------+-------------+-------------+-------------------+--------------+-----------------------+ |
 |
MariaDB [test]> insert into v (b) values (1); |
ERROR 1906 (HY000): The value specified for generated column 'b' in table 't' has been ignored |