The generator makes all integer columns as […, 'default', 'value' => null] even column set as not null

[Mirocow]

What steps will reproduce the problem?

We have some problem with pgsql generating model rules
The generator makes all integer columns as […, 'default', 'value' => null] even column set as not null

What is the expected result?

What do you get instead?

Replace code from (https://github.com/yiisoft/yii2-gii/blob/master/src/generators/model/Generator.php#L358)

if ($driverName === 'pgsql' && $type === 'integer') {
    $rules[] = "[['" . implode("', '", $columns) . "'], 'default', 'value' => null]";
}

into

if ($driverName === 'pgsql' && $type === 'integer') {
    $defaultColumns = isset($types['required']) ? array_diff($columns, $types['required']) : $columns;
    if ($defaultColumns) {
        $rules[] = "[['" . implode("', '", $defaultColumns) . "'], 'default', 'value' => null]";
    }
}

Additional info

Q	A
Yii version	2.0.16?
PHP version	7.2
Operating system	Debian

[alexkart]

I've verified this and confirm that it generates the same default rule for null and not null columns.
But, does anyone know what's the purpose of specifying a default value equals null for integers in postgresql?
I mean why is this block of code needed?

if ($driverName === 'pgsql' && $type === 'integer') {
    $rules[] = "[['" . implode("', '", $columns) . "'], 'default', 'value' => null]";
}