src/db/Grammar.class.php
protected function whereNull(Builder $query, $where) {
		$null = $where['not'] ? 'not null' : 'null';
		
		return $this->wrap($where['column']).' is '.$null;
	}
protected function whereNull(Builder $query, $where) {
		$null = $where['not'] ? 'not null' : 'null';
		
		return $this->wrap($where['column']).' is '.$null;
	}
Compile a "where null" clause.

@param  Builder $query
@param  array  $where
@return string