NosqlPrimarySelector::checkQuery

static function checkQuery(\Bitrix\Main\Data\Connection $connection, Query $query)
{
	// check interface
	if (!($connection instanceof INosqlPrimarySelector))
	{
		return false;
	}

	// no expressions in select
	foreach ($query->getSelectChains() as $selectChain)
	{
		if ($selectChain->getLastElement()->getValue() instanceof ExpressionField)
		{
			return false;
		}
	}

	// skip empty select - useless case for nosql api
	if (empty($query->getSelect()))
	{
		return false;
	}

	// if empty joinmap, group, order and simple filter
	if (!count($query->getJoinMap()) && !count($query->getGroupChains()) && !count($query->getOrderChains()) && !count($query->getHavingChains()))
	{
		$entityPrimary = $query->getEntity()->getPrimary();

		// check for primary singularity
		if (!is_array($entityPrimary))
		{
			// check if only primary is in filter
			if (count($query->getFilterChains()) == 1 && key($query->getFilterChains()) === $entityPrimary)
			{
				$passFilter = true;

				// check if only equality operations & 1-level filter
				if ($query->getFilter())
				{
					foreach ($query->getFilter() as $filterElement => $filterValue)
					{
						if (is_numeric($filterElement) && is_array($filterValue))
						{
							// filter has subfilters. not ok
							$passFilter = false;
							break;
						}

						// no multiple values for HSPHP
						if (is_array($filterValue))
						{
							$passFilter = false;
							break;
						}

						// skip system keys
						if ($filterElement === 'LOGIC')
						{
							continue;
						}

						$operation = substr($filterElement, 0, 1);

						if ($operation !== '=')
						{
							// only equal operation allowed. not ok
							$passFilter = false;
							break;
						}
					}
				}
				elseif ($query->getFilterHandler()->hasConditions())
				{
					foreach ($query->getFilterHandler()->getConditions() as $condition)
					{
						if ($condition->getOperator() !== '=' || !is_scalar($condition->getValue()))
						{
							$passFilter = false;
							break;
						}
					}
				}


				// fine!
				if ($passFilter)
				{
					return true;
				}
			}
		}
	}

	return false;
}