Slow configurable product attribute option loading

[abdel-aouby]

Summary

When adding configurable products to the cart. it is loading all attribute options regardless if they are product attributes or not. then it is filtering them in a cycle. this is a super slow DB query if you have many options in every attribute. the query that is used is

SELECT `main_table`.*, `tdv`.`value` AS `default_value`, `tsv`.`value` AS `store_default_value`, IF(tsv.value_id > ?, tsv.value, tdv.value) AS `value` FROM `eav_attribute_option` AS `main_table`
 INNER JOIN `eav_attribute_option_value` AS `tdv` ON tdv.option_id = main_table.option_id
 LEFT JOIN `eav_attribute_option_value` AS `tsv` ON tsv.option_id = main_table.option_id AND tsv.store_id = ?
WHERE (`main_table`.`attribute_id` = ?) AND (tdv.store_id = ?) ORDER BY main_table.sort_order ASC, value ASC

this is coming from the method loadOption which is called in the collection method _afterLoad \Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable\Attribute\Collection::_afterLoad

down the investigation, I noticed that this was the case (loading only specific options) until 2015 when it was changed here

https://github.com/magento/magento2/commit/e3cecafccd999ee3b9ab5df0094dec02c12fad8c#diff-c249eb28ea2a6ea127a89163935e65daea074ebe64b9cd895fa791168b5e7e03R256-R283

any reason for this change?

This is called at least 5 times when using AddProductToCart graphQl request on a configurable product. resulting in a significant performance issue when the configurable product has attributes with thousands of options

Examples

Down the stack trace of the method loadOptions() that is called in _afterLoad() we can see.

1. \Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable\Attribute\Collection::_afterLoad
2. \Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable\Attribute\Collection::loadOptions
3. \Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable::getAttributeOptions
4. \Magento\ConfigurableProduct\Model\AttributeOptionProvider::getAttributeOptions

In the method getAttributeOptions(AbstractAttribute $superAttribute, $productId) there is a call for getAllOptions(false); which is loading all attribute options, then down is a foreach loop foreach ($data as $key => $value) and inside we are looping the $data and taking/selecting only the options that match $value['value_index'] ignoring the rest of options that are all loaded. because they are not needed at first

my solution would be to initially not call getAllOptions(false); and use values of the index $value['value_index'] to load only necessary options. using $superAttribute->getSource()->getSpecificOptions(array_unique($attributeValues));

$attributeValues will be the values of value_index from the array $data. which could be retrieved using a combination of array_search array_column or a classic loop on $data

Proposed solution

-  $options = $superAttribute->getSource()->getAllOptions(false);
+ $optionIds = [];
+ foreach ($data as $key => $value) {
+       $optionIds[] = $value['value_index'];
+ }

+ $options = $superAttribute->getSource()->getSpecificOptions(array_unique($optionIds), false);

Release note

No response

Triage and priority

• [ ] Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• [ ] Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• [X] Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• [ ] Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• [ ] Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

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[andrewbess]

Hello @abdel-aouby Thank you for your contribution I think this is great idea to discuss it with community

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[engcom-November]

Hello @abdel-aouby,

Thank you for the report and collaboration!

Verified this issue on 2.4-develop. When adding a configurable product to cart, all the attributes are being loaded with the below query, which are not required.

## 77937 ## QUERY
SQL: SELECT `main_table`.*, `tdv`.`value` AS `default_value`, `tsv`.`value` AS `store_default_value`, IF(tsv.value_id > 0, tsv.value, tdv.value) AS `value` FROM `eav_attribute_option` AS `main_table`
 INNER JOIN `eav_attribute_option_value` AS `tdv` ON tdv.option_id = main_table.option_id
 LEFT JOIN `eav_attribute_option_value` AS `tsv` ON tsv.option_id = main_table.option_id AND tsv.store_id = '1' WHERE (`main_table`.`attribute_id` = '83') AND (tdv.store_id = 0) ORDER BY main_table.sort_order ASC, `value` ASC

Hence issue can be confirmed.

Thank you.

[github-jira-sync-bot]

:white_check_mark: Jira issue https://jira.corp.adobe.com/browse/AC-10831 is successfully created for this GitHub issue.

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:white_check_mark: Confirmed by @engcom-November. Thank you for verifying the issue.
Issue Available: @engcom-November, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[martin-cod]

my solution would be to initially not call getAllOptions(false); and use values of the index $value['value_index'] to load only necessary options. using $superAttribute->getSource()->getSpecificOptions(array_unique($attributeValues));

I want to argue regarding the proposed solution because this approach has another performance degradation issue #38934 related to not optimized getSpecificOptions

Also, please keep in mind that getSpecificOptions is a unique method for only class \Magento\Eav\Model\Entity\Attribute\Source\Table and this is not a public contract method of \Magento\Eav\Model\Entity\Attribute\Source\AbstractSource class or \Magento\Eav\Model\Entity\Attribute\Source\SourceInterface interface