In Magento\Catalog\Model\Indexer\Product\Flat\Action\Indexer there is one constant:

 * Maximum size of attributes chunk

reference: https://github.com/magento/magento2/blob/2.0/app/code/Magento/Catalog/Model/Indexer/Product/Flat/Action/Indexer.php#L26

It serves for splitting attributes into chunks during Flat table indexation process.

The question is: Why 59?


Mysql has a limit of 63 joins per query. The 4 remaining are reserved for things like website and category associations.

  • Great answer, wasn't thought about that limitation in the variety of MySQL limitations. – Sinisa Nedeljkovic Mar 3 '17 at 8:40

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