Обсуждение: BUG #12625: operation 'union' confirms the type of the column with 2 unknown types.

The following bug has been logged on the website:

Bug reference:      12625
Logged by:          Chongwei Yuan
Email address:      yuanchongwei007@163.com
PostgreSQL version: 9.3.5
Operating system:   Ubuntu 14.04.1 LTS
Description:

1. exce sql [ select 'abc' as col ] ; result : column 'col' has unknow
type.
2. exce sql [ select 'def' as col ] ; result : column 'col' has unknow
type.
But
3. exce sql [ select 'abc' as col union select 'def' as col ] ; result :
colum 'col' has text type.

yuanchongwei007 wrote
> The following bug has been logged on the website:
>
> Bug reference:      12625
> Logged by:          Chongwei Yuan
> Email address:

> yuanchongwei007@

> PostgreSQL version: 9.3.5
> Operating system:   Ubuntu 14.04.1 LTS
> Description:
>
> 1. exce sql [ select 'abc' as col ] ; result : column 'col' has unknow
> type.
> 2. exce sql [ select 'def' as col ] ; result : column 'col' has unknow
> type.
> But
> 3. exce sql [ select 'abc' as col union select 'def' as col ] ; result :
> colum 'col' has text type.

This is working as intended.  If you have a problem with this you might want
to explain what that is.  If anything, IMO, the first two queries have the
problem, not the third.

David J.





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