protected function getCriteriaConditions( array $params )
	{
		$expr = [];

		if( isset( $params['key'] ) )
		{
			foreach( (array) $params['key'] as $idx => $key )
			{
				if( $key != '' && isset( $params['op'][$idx] ) && $params['op'][$idx] != ''
					&& isset( $params['val'][$idx] ) && $params['val'][$idx] != ''
				) {
					$expr[] = [$params['op'][$idx] => [$key => $params['val'][$idx]]];
				}
			}

			if( !empty( $expr ) ) {
				$expr = ['&&' => $expr];
			}
		}

		return $expr;
	}