BaseSelectFullTextSearchStrategy.php

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<?php
namespace Magento\CatalogSearch\Model\Adapter\Mysql\BaseSelectStrategy;

use Magento\CatalogSearch\Model\Search\BaseSelectStrategy\BaseSelectStrategyInterface;
use Magento\CatalogSearch\Model\Search\SelectContainer\SelectContainer;
use Magento\Framework\Indexer\ScopeResolver\IndexScopeResolver;
use Magento\Framework\App\ResourceConnection;

class BaseSelectFullTextSearchStrategy implements BaseSelectStrategyInterface
{
    private $scopeResolver;

    private $resource;

    public function __construct(
        ResourceConnection $resource,
        IndexScopeResolver $scopeResolver
    ) {
        $this->resource = $resource;
        $this->scopeResolver = $scopeResolver;
    }

    public function createBaseSelect(SelectContainer $selectContainer)
    {
        $select = $this->resource->getConnection()->select();

        $tableName = $this->scopeResolver->resolve(
            $selectContainer->getUsedIndex(),
            $selectContainer->getDimensions()
        );

        $select->from(
            ['search_index' => $tableName],
            ['entity_id' => 'entity_id']
        )->joinInner(
            ['cea' => $this->resource->getTableName('catalog_eav_attribute')],
            'search_index.attribute_id = cea.attribute_id',
            []
        );

        $selectContainer = $selectContainer->updateSelect($select);
        return $selectContainer;
    }
}