ActiveQuery can not be built in DQLQueryBuilder

[olegbaturin]

Description

The error occurs then trying to use ActiveQuer in a subquery.

$q = Order::query()->select(new Expression('1'));
Item::query()->where(new Exists($q))->all();

Yiisoft\Db\Exception\NotSupportedException: Expression of class Yiisoft\ActiveRecord\ActiveQuery can not be built in Yiisoft\Db\Pgsql\DQLQueryBuilder in \vendor\yiisoft\db\src\QueryBuilder\AbstractDQLQueryBuilder.php:483

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