SqlCountCache.php

<?php

declare (strict_types=1);
namespace Drupal\migrate_sql_count_cache_test\Plugin\migrate\source;

use Drupal\migrate\Attribute\MigrateSource;
use Drupal\migrate\Plugin\migrate\source\SqlBase;

/**
 * Source plugin for Sql count cache test.
 */
class SqlCountCache extends SqlBase {
  
  /**
   * {@inheritdoc}
   */
  public function fields() {
    return [
      'id' => $this->t('Id'),
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function getIds() {
    return [
      'id' => [
        'type' => 'integer',
      ],
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function query() {
    return $this->select('source_table', 's')
      ->fields('s', [
      'id',
    ]);
  }

}