SMO issue with default column values.

Greetings. To reproduce. . .

Create the following table:

CREATE TABLE DefaultTest (
    [FlagValue] INT DEFAULT 10
)

Then, generate the SMO script. You will get:

CREATE TABLE [dbo].[DefaultTest] (
    [FlagValue] INT DEFAULT ((10)) NULL
);

This is odd, why has the 10 become ((10))? Syntax wise, 10 is OK.
The same happens if you create the table without the default, then add it with:

ALTER TABLE DefaultTest ADD DEFAULT 10 FOR [FlagValue]

What's interesting, is that if you use Azure Data Studio to edit the ((10)) default value in the UI back to 10 (maybe the UI isn't using SMO?), the SQL it generates displays as:

CREATE TABLE [dbo].[DefaultTest] (
    [FlagValue] INT DEFAULT 10 NULL
);

. . . which instantly becomes ((10)) again when you apply the change to the database.

Now, the engine always stores the constraints definition wrapped with ( and ).
I contend there is a bug in SMO -- if the value within parenthesis is a primitive (string, integer, etc), then it doesn't need parenthesis.

Why is this a problem? Currently writing code to compare schemas against two databases, and having to parse weird output from DacFx's ScriptComparison, which is complaining that default values of (0) sometimes become ((0)). Now, I can write an AST parser using ScriptDom, but isn't this an SMO error?

Basically, it means that SMO isn't generating a technically identical representation of the table.

Thanks!

Comece reproduzindo os casos de CREATE TABLE e ALTER TABLE no SMO e, em seguida, rastreie o caminho de geração de scripts de valores padrão do SMO que produz o SQL gerado. Compare a saída com a definição do banco de dados e o comportamento de DacFx ScriptComparison; considera-se concluído quando valores padrão primitivos, como 10 ou 0, são representados de forma consistente e sem parênteses redundantes.