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Editing: class-link-query.php

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<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Admin\Links
 */

/**
 * Database helper class.
 */
class WPSEO_Link_Query {

/**
	 * Determine if there are any unprocessed public posts.
	 *
	 * @param array $post_types List of post types to check with.
	 *
	 * @return bool True if unprocessed posts are found, false if none are found.
	 */
	public static function has_unprocessed_posts( array $post_types ) {
		global $wpdb;

if ( empty( $post_types ) ) {
			return false;
		}

$post_types  = self::format_post_types( $post_types );
		$count_table = self::get_count_table_name();

// Get any object which has not got the processed meta key.
		$query = '
			SELECT ID
			  FROM ' . $wpdb->posts . ' AS posts
		 LEFT JOIN ' . $count_table . ' AS yoast_meta
				ON yoast_meta.object_id = posts.ID
			 WHERE posts.post_status = "publish"
			   AND posts.post_type IN ( ' . $post_types . ' )
			   AND yoast_meta.internal_link_count IS NULL
			 LIMIT 1';

// If anything is found, we have unprocessed posts.
		$results = $wpdb->get_var( $query );

return ! empty( $results );
	}

/**
	 * Filter out posts that have not been processed yet.
	 *
	 * @param array $post_ids Post IDs to filter.
	 *
	 * @return array
	 */
	public static function filter_unprocessed_posts( array $post_ids ) {
		global $wpdb;

$post_ids = array_filter( $post_ids );
		if ( empty( $post_ids ) || $post_ids === [] ) {
			return $post_ids;
		}

$count_table = self::get_count_table_name();

$query = '
			SELECT object_id
			  FROM ' . $count_table . '
			 WHERE object_id IN ( ' . implode( ',', $post_ids ) . ' )
			';

$results = $wpdb->get_results( $query, ARRAY_A );

return array_map( 'intval', wp_list_pluck( $results, 'object_id' ) );
	}

/**
	 * Returns a limited set of unindexed posts.
	 *
	 * @param array $post_types The post type.
	 * @param int   $limit      The limit for the resultset.
	 *
	 * @return array|null|object The set of unindexed posts.
	 */
	public static function get_unprocessed_posts( array $post_types, $limit = 5 ) {
		global $wpdb;

$count_table = self::get_count_table_name();
		$post_types  = self::format_post_types( $post_types );

// @codingStandardsIgnoreStart
		$query = 'SELECT posts.ID, posts.post_content
				  FROM ' . $wpdb->posts . ' AS posts
			 LEFT JOIN ' . $count_table . ' AS yoast_meta
			 		ON yoast_meta.object_id = posts.ID
				 WHERE posts.post_status = "publish"
				   AND posts.post_type IN ( ' . $post_types . ' )
				   AND yoast_meta.internal_link_count IS NULL
				 LIMIT %d
		';
		// @codingStandardsIgnoreEnd

return $wpdb->get_results(
			$wpdb->prepare( $query, $limit )
		);
	}

/**
	 * Returns the total amount of unindexed posts for given post type.
	 *
	 * @param array $post_types The post types.
	 *
	 * @return int The total of unindexed posts.
	 */
	public static function get_unprocessed_count( array $post_types ) {
		global $wpdb;

if ( empty( $post_types ) ) {
			return 0;
		}

$count_table = self::get_count_table_name();
		$post_types  = self::format_post_types( $post_types );

// @codingStandardsIgnoreStart
		$query = '
			SELECT COUNT( posts.ID )
			  FROM ' . $wpdb->posts . ' AS posts
		 LEFT JOIN ' . $count_table . ' AS yoast_meta
				ON yoast_meta.object_id = posts.ID
			 WHERE posts.post_status = "publish"
			   AND posts.post_type IN ( ' . $post_types . ' )
			   AND yoast_meta.internal_link_count IS NULL';
		// @codingStandardsIgnoreEnd

return (int) $wpdb->get_var( $query );
	}

/**
	 * Returns the table name where the counts are stored.
	 *
	 * @return string
	 */
	protected static function get_count_table_name() {
		$storage = new WPSEO_Meta_Storage();
		return $storage->get_table_name();
	}

/**
	 * Formats an array with post types as an SQL string.
	 *
	 * @param array $post_types The post types to format.
	 *
	 * @return string Post types formatted for use in SQL statement.
	 */
	protected static function format_post_types( array $post_types ) {
		$sanitized_post_types = array_map( 'esc_sql', $post_types );
		$post_types           = sprintf( '"%s"', implode( '", "', $sanitized_post_types ) );

return $post_types;
	}
}

Editing: class-link-query.php

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