src/QueryBuilder/QueryBuilder.php
public function select(?string $expression = null, ...$args): self
	{
		$this->dirty();
		$this->select = $expression === null ? null : [$expression];
		$this->args['select'] = $args;
		return $this;
	}
public function select(?string $expression = null, ...$args): self
	{
		$this->dirty();
		$this->select = $expression === null ? null : [$expression];
		$this->args['select'] = $args;
		return $this;
	}
Sets expression as SELECT clause. Passing null sets clause to the default state.