A proposed change for the get_sortable_columns() function in class-wp-plugins-list-table.php.

0-readme

Currently, WordPress has hooks and filters available to add columns and rows to screens. ie: plugin, post, pages, etc.

Add custom columns hook: manage_{screen->id}_columns
Add custom row data filter: manage_plugins_custom_column

However, to make those columns sortable you must reference the key-value entries manage_{screen->id}_columns
in get_sortable_columns() for the specific screen. ie: class-wp-plugins-list-table.php Line 263 shown below.

The only way to modify that value is to edit core. I believe we should filter the returned array. That will
allow developers to specify whether or not their custom columns are sortable.

p.s. The plugin's column 'name' used to be sortable four years ago.
See - https://core.trac.wordpress.org/ticket/16322#comment:3 - Let's make it sortable! :D

UPDATE: I poked around in Yoast SEO to see how they added sortable custom columns. I figured they would have
to rewrite a custom WP_List_Table class and indeed they do. Maybe there are some more places in in the
List Tables that could have some easier-to-use hooks and filters. I've also attached the function they
use for adding custom columns.

example-plugin-author.php

/**
 * Filter the $columns array to insert our plugin_author key-value entry.
 *
 * @since 1.0.0
 *
 * @see http://hookr.io/4.1.1/filters/manage_id_columns/
 */
add_filter( 'manage_plugins_columns', 'example_add_plugin_author_column' );
function example_add_plugin_author_column( $columns ) {

    $author_column = array( 'plugin_author' => 'Author' );

    $columns = array_merge( $columns, $author_column );

    return $columns;
}

/**
 * Add the plugin data to display the Author in the table's row.
 *
 * @since 1.0.0
 *
 * @param string $column_name Name of the column.
 * @param string $plugin_file Path to the plugin file.
 * @param array  $plugin_data An array of plugin data.
 */
add_action( 'manage_plugins_custom_column', 'example_add_plugin_author_row', 10, 2 );
function example_add_plugin_author_row( $column_name, $plugin_file, $plugin_data ) {

    $column_name = 'plugin_author';

    echo $plugin_data['Author'];
}

/**
 * Filter the sortable column array and merge our custom 'Author' entry.
 *
 * @since 1.0.0
 *
 * @param array $sortable_plugin_columns An array of sortable columns as a 'key' => 'value' entry.
 */
add_filter( 'get_plugin_sortable_columns', 'example_make_plugin_author_row_sortable' );
function example_make_plugin_author_row_sortable( $sortable_plugin_columns ) {

    $new_sortable_plugin_columns = array( 'name' => 'name', 'plugin_author' => 'Author' );

    $sortable_plugin_columns = array_merge( $new_sortable_plugin_columns, $sortable_plugin_columns );

    return $sortable_plugin_columns;
}

new-class-wp-plugins-list-table.php

//* Line 263 of wp-admin/includes/class-wp-plugins-list-table.php

protected function get_sortable_columns() {
	$sortable_plugin_columns = array();

	/**
	 * Filter the list of sortable columns on the plugin screen.
	 *
	 * The dynamic portion of this filter is the $sortable_plugin_columns, which
	 * accepts a 'key' => 'value' entry into the array. For example, plugin name
	 * would be 'name' => 'name'.
	 *
	 * @since TODO
	 * 
	 * @param array	$sortable_plugin_columns An array of sortable columns as a 'key' => 'value' entry.
	 */
	return apply_filters( 'get_plugin_sortable_columns', $sortable_plugin_columns );
}

old-class-wp-plugins-list-table.php

//* Line 263 of wp-admin/includes/class-wp-plugins-list-table.php

protected function get_sortable_columns() {
	return array();
}

wordpress-seo.admin.class-bulk-editor-list-table.php

<?php
/**
 * @package WPSEO\Admin\Bulk Editor
 * @since      1.5.0
 */

/**
 * Implements table for bulk editing.
 */
class WPSEO_Bulk_List_Table extends WP_List_Table {

	/**
	 * The nonce that was passed with the request
	 *
	 * @var string
	 */
	private $nonce;

	/**
	 * Array of post types for which the current user has `edit_others_posts` capabilities.
	 *
	 * @var array
	 */
	private $all_posts;

	/**
	 * Array of post types for which the current user has `edit_posts` capabilities, but not `edit_others_posts`.
	 *
	 * @var array
	 */
	private $own_posts;

	/**
	 * Saves all the metadata into this array.
	 *
	 * @var array
	 */
	protected $meta_data = array();

	/**
	 * The current requested page_url
	 *
	 * @var string
	 */
	private $request_url;

	/**
	 * The current page (depending on $_GET['paged']) if current tab is for current page_type, else it will be 1
	 *
	 * @var integer
	 */
	private $current_page;

	/**
	 * The current post filter, if is used (depending on $_GET['post_type_filter'])
	 *
	 * @var string
	 */
	private $current_filter;

	/**
	 * The current post status, if is used (depending on $_GET['post_status'])
	 *
	 * @var string
	 */
	private $current_status;

	/**
	 * The current sorting, if used (depending on $_GET['order'] and $_GET['orderby'])
	 *
	 * @var string
	 */
	private $current_order;

	/**
	 * The page_type for current class instance (for example: title / description).
	 *
	 * @var string
	 */
	protected $page_type;

	/**
	 * Based on the page_type ($this->page_type) there will be constructed an url part, for subpages and
	 * navigation
	 *
	 * @var string
	 */
	protected $page_url;

	/**
	 * The settings which will be used in the __construct.
	 *
	 * @var array
	 */
	protected $settings;

	/**
	 * @var array
	 */
	protected $pagination = array();

	/**
	 * Class constructor
	 */
	function __construct() {
		parent::__construct( $this->settings );

		$this->request_url    = $_SERVER['REQUEST_URI'];
		$this->current_page   = ( ! empty( $_GET['paged'] ) ) ? $_GET['paged'] : 1;
		$this->current_filter = ( ! empty( $_GET['post_type_filter'] ) ) ? $_GET['post_type_filter'] : 1;
		$this->current_status = ( ! empty( $_GET['post_status'] ) ) ? $_GET['post_status'] : 1;
		$this->current_order  = array(
			'order'   => ( ! empty( $_GET['order'] ) ) ? $_GET['order'] : 'asc',
			'orderby' => ( ! empty( $_GET['orderby'] ) ) ? $_GET['orderby'] : 'post_title',
		);

		$this->verify_nonce();

		$this->nonce    = wp_create_nonce( 'bulk-editor-table' );
		$this->page_url = "&nonce={$this->nonce}&type={$this->page_type}#top#{$this->page_type}";

		$this->populate_editable_post_types();

	}

	/**
	 * Verifies nonce if additional parameters have been sent.
	 *
	 * Shows an error notification if the nonce check fails.
	 */
	private function verify_nonce() {
		if ( $this->should_verify_nonce() && ! wp_verify_nonce( filter_input( INPUT_GET, 'nonce' ), 'bulk-editor-table' ) ) {
			Yoast_Notification_Center::get()->add_notification( new Yoast_Notification( __( 'You are not allowed to access this page.', 'wordpress-seo' ), array( 'type' => 'error' ) ) );
			Yoast_Notification_Center::get()->display_notifications();
			die;
		}
	}

	/**
	 * checks if additional parameters have been sent to determine if nonce should be checked or not.
	 *
	 * @return bool
	 */
	private function should_verify_nonce() {
		$possible_params = array(
			'type',
			'paged',
			'post_type_filter',
			'post_status',
			'order',
			'orderby',
		);

		foreach ( $possible_params as $param_name ) {
			if ( filter_input( INPUT_GET, $param_name ) ) {
				return true;
			}
		}
	}

	/**
	 * Prepares the data and renders the page.
	 */
	public function show_page() {
		$this->prepare_page_navigation();
		$this->prepare_items();

		$this->views();
		$this->display();
	}

	/**
	 * Used in the constructor to build a reference list of post types the current user can edit.
	 */
	protected function populate_editable_post_types() {
		$post_types = get_post_types( array( 'public' => true, 'exclude_from_search' => false ), 'object' );

		$this->all_posts = array();
		$this->own_posts = array();

		if ( is_array( $post_types ) && $post_types !== array() ) {
			foreach ( $post_types as $post_type ) {
				if ( ! current_user_can( $post_type->cap->edit_posts ) ) {
					continue;
				}

				if ( current_user_can( $post_type->cap->edit_others_posts ) ) {
					$this->all_posts[] = esc_sql( $post_type->name );
				}
				else {
					$this->own_posts[] = esc_sql( $post_type->name );
				}
			}
		}
	}


	/**
	 * Will shown the navigation for the table like pagenavigation and pagefilter;
	 *
	 * @param string $which
	 */
	function display_tablenav( $which ) {
		$post_status = sanitize_text_field( filter_input( INPUT_GET, 'post_status' ) );
		?>
		<div class="tablenav <?php echo esc_attr( $which ); ?>">

			<?php if ( 'top' === $which ) { ?>
			<form id="posts-filter" action="" method="get">
				<input type="hidden" name="nonce" value="<?php echo $this->nonce; ?>"/>
				<input type="hidden" name="page" value="wpseo_tools"/>
				<input type="hidden" name="tool" value="bulk-editor"/>
				<input type="hidden" name="type" value="<?php echo esc_attr( $this->page_type ); ?>"/>
				<input type="hidden" name="orderby"
				       value="<?php echo esc_attr( filter_input( INPUT_GET, 'orderby' ) ); ?>"/>
				<input type="hidden" name="order"
				       value="<?php echo esc_attr( filter_input( INPUT_GET, 'order' ) ); ?>"/>
				<input type="hidden" name="post_type_filter"
				       value="<?php echo esc_attr( filter_input( INPUT_GET, 'post_type_filter' ) ); ?>"/>
				<?php if ( ! empty( $post_status ) ) { ?>
					<input type="hidden" name="post_status" value="<?php echo esc_attr( $post_status ); ?>"/>
				<?php } ?>
				<?php } ?>

				<?php
				$this->extra_tablenav( $which );
				$this->pagination( $which );
				?>

				<br class="clear"/>
				<?php if ( 'top' === $which ) { ?>
			</form>
		<?php } ?>
		</div>

	<?php
	}

	/**
	 * This function builds the base sql subquery used in this class.
	 *
	 * This function takes into account the post types in which the current user can
	 * edit all posts, and the ones the current user can only edit his/her own.
	 *
	 * @return string $subquery The subquery, which should always be used in $wpdb->prepare(), passing the current user_id in as the first parameter.
	 */
	function get_base_subquery() {
		global $wpdb;

		$all_posts_string = "'" . implode( "', '", $this->all_posts ) . "'";
		$own_posts_string = "'" . implode( "', '", $this->own_posts ) . "'";

		$post_author = esc_sql( (int) get_current_user_id() );

		$subquery = "(
				SELECT *
				FROM {$wpdb->posts}
				WHERE post_type IN ({$all_posts_string})
				UNION ALL
				SELECT *
				FROM {$wpdb->posts}
				WHERE post_type IN ({$own_posts_string}) AND post_author = {$post_author}
			) sub_base";

		return $subquery;
	}


	/**
	 * @return array
	 */
	function get_views() {
		global $wpdb;

		$status_links = array();

		$states          = get_post_stati( array( 'show_in_admin_all_list' => true ) );
		$states['trash'] = 'trash';
		$states          = esc_sql( $states );
		$all_states      = "'" . implode( "', '", $states ) . "'";

		$subquery = $this->get_base_subquery();

		$total_posts = $wpdb->get_var(
			"
					SELECT COUNT(ID) FROM {$subquery}
					WHERE post_status IN ({$all_states})
				"
		);


		$post_status         = filter_input( INPUT_GET, 'post_status' );
		$class               = empty( $post_status ) ? ' class="current"' : '';
		$status_links['all'] = '<a href="' . esc_url( admin_url( 'admin.php?page=wpseo_tools&tool=bulk-editor' . $this->page_url ) ) . '"' . $class . '>' . sprintf( _nx( 'All <span class="count">(%s)</span>', 'All <span class="count">(%s)</span>', $total_posts, 'posts', 'wordpress-seo' ), number_format_i18n( $total_posts ) ) . '</a>';

		$post_stati = get_post_stati( array( 'show_in_admin_all_list' => true ), 'objects' );
		if ( is_array( $post_stati ) && $post_stati !== array() ) {
			foreach ( $post_stati as $status ) {

				$status_name = esc_sql( $status->name );

				$total = (int) $wpdb->get_var(
					$wpdb->prepare(
						"
								SELECT COUNT(ID) FROM {$subquery}
								WHERE post_status = %s
							",
						$status_name
					)
				);

				if ( $total === 0 ) {
					continue;
				}

				$class = '';
				if ( $status_name === $post_status ) {
					$class = ' class="current"';
				}

				$status_links[ $status_name ] = '<a href="' . esc_url( add_query_arg( array( 'post_status' => $status_name ), admin_url( 'admin.php?page=wpseo_tools&tool=bulk-editor' . $this->page_url ) ) ) . '"' . $class . '>' . sprintf( translate_nooped_plural( $status->label_count, $total ), number_format_i18n( $total ) ) . '</a>';
			}
		}
		unset( $post_stati, $status, $status_name, $total, $class );

		$trashed_posts = $wpdb->get_var(
			"
					SELECT COUNT(ID) FROM {$subquery}
					WHERE post_status IN ('trash')
				"
		);

		$class = '';
		if ( 'trash' === $post_status ) {
			$class = 'class="current"';
		}
		$status_links['trash'] = '<a href="' . esc_url( admin_url( 'admin.php?page=wpseo_tools&tool=bulk-editor&post_status=trash' . $this->page_url ) ) . '"' . $class . '>' . sprintf( _nx( 'Trash <span class="count">(%s)</span>', 'Trash <span class="count">(%s)</span>', $trashed_posts, 'posts', 'wordpress-seo' ), number_format_i18n( $trashed_posts ) ) . '</a>';

		return $status_links;
	}


	/**
	 * @param string $which
	 */
	function extra_tablenav( $which ) {

		if ( 'top' === $which ) {
			$post_types = get_post_types( array( 'public' => true, 'exclude_from_search' => false ) );

			if ( is_array( $post_types ) && $post_types !== array() ) {
				global $wpdb;

				echo '<div class="alignleft actions">';

				$post_types = esc_sql( $post_types );
				$post_types = "'" . implode( "', '", $post_types ) . "'";

				$states          = get_post_stati( array( 'show_in_admin_all_list' => true ) );
				$states['trash'] = 'trash';
				$states          = esc_sql( $states );
				$all_states      = "'" . implode( "', '", $states ) . "'";

				$subquery = $this->get_base_subquery();

				$post_types = $wpdb->get_results(
					"
							SELECT DISTINCT post_type FROM {$subquery}
							WHERE post_status IN ({$all_states})
							ORDER BY 'post_type' ASC
						"
				);

				$post_type_filter = filter_input( INPUT_GET, 'post_type_filter' );
				$selected         = ( ! empty( $post_type_filter ) ) ? sanitize_text_field( $post_type_filter ) : '-1';

				$options = '<option value="-1">Show All Post Types</option>';

				if ( is_array( $post_types ) && $post_types !== array() ) {
					foreach ( $post_types as $post_type ) {
						$obj = get_post_type_object( $post_type->post_type );
						$options .= sprintf( '<option value="%2$s" %3$s>%1$s</option>', $obj->labels->name, $post_type->post_type, selected( $selected, $post_type->post_type, false ) );
					}
				}

				echo sprintf( '<select name="post_type_filter">%1$s</select>', $options );
				submit_button( __( 'Filter', 'wordpress-seo' ), 'button', false, false, array( 'id' => 'post-query-submit' ) );
				echo '</div>';
			}
		}
	}

	/**
	 *
	 * @return array
	 */
	function get_sortable_columns() {
		return $sortable = array(
			'col_page_title' => array( 'post_title', true ),
			'col_post_type'  => array( 'post_type', false ),
			'col_post_date'  => array( 'post_date', false ),
		);
	}

	/**
	 * Sets the correct pagenumber and pageurl for the navigation
	 */
	function prepare_page_navigation() {

		$request_url = $this->request_url . $this->page_url;

		$current_page   = $this->current_page;
		$current_filter = $this->current_filter;
		$current_status = $this->current_status;
		$current_order  = $this->current_order;

		// If current type doesn't compare with objects page_type, than we have to unset some vars in the requested url (which will be use for internal table urls)
		if ( $_GET['type'] != $this->page_type ) {
			$request_url = remove_query_arg( 'paged', $request_url ); // page will be set with value 1 below.
			$request_url = remove_query_arg( 'post_type_filter', $request_url );
			$request_url = remove_query_arg( 'post_status', $request_url );
			$request_url = remove_query_arg( 'orderby', $request_url );
			$request_url = remove_query_arg( 'order', $request_url );
			$request_url = add_query_arg( 'pages', 1, $request_url );

			$current_page   = 1;
			$current_filter = '-1';
			$current_status = '';
			$current_order  = array( 'orderby' => 'post_title', 'order' => 'asc' );

		}

		$_SERVER['REQUEST_URI'] = $request_url;

		$_GET['paged']                = $current_page;
		$_REQUEST['paged']            = $current_page;
		$_REQUEST['post_type_filter'] = $current_filter;
		$_GET['post_type_filter']     = $current_filter;
		$_GET['post_status']          = $current_status;
		$_GET['orderby']              = $current_order['orderby'];
		$_GET['order']                = $current_order['order'];

	}

	/**
	 * Preparing the requested pagerows and setting the needed variables
	 */
	function prepare_items() {

		$post_type_clause = $this->get_post_type_clause();
		$all_states       = $this->get_all_states();
		$subquery         = $this->get_base_subquery();

		// Setting the column headers
		$this->set_column_headers();

		// Count the total number of needed items and setting pagination given $total_items
		$total_items = $this->count_items( $subquery, $all_states, $post_type_clause );
		$this->set_pagination( $total_items );

		// Getting items given $query
		$query = $this->parse_item_query( $subquery, $all_states, $post_type_clause );
		$this->get_items( $query );

		// Get the metadata for the current items ($this->items)
		$this->get_meta_data();

	}

	/**
	 * Getting the columns for first row
	 *
	 * @return array
	 */
	public function get_columns() {
		return $this->merge_columns();
	}

	/**
	 * Setting the column headers
	 */
	protected function set_column_headers() {
		$columns               = $this->get_columns();
		$hidden                = array();
		$sortable              = $this->get_sortable_columns();
		$this->_column_headers = array( $columns, $hidden, $sortable );
	}

	/**
	 * Counting total items
	 *
	 * @param string $subquery
	 * @param string $all_states
	 * @param string $post_type_clause
	 *
	 * @return mixed
	 */
	protected function count_items( $subquery, $all_states, $post_type_clause ) {
		global $wpdb;
		$total_items = $wpdb->get_var(
			"
					SELECT COUNT(ID)
					FROM {$subquery}
					WHERE post_status IN ({$all_states}) $post_type_clause
				"
		);

		return $total_items;
	}

	/**
	 * Getting the post_type_clause filter
	 *
	 * @return string
	 */
	protected function get_post_type_clause() {
		// Filter Block
		$post_types       = null;
		$post_type_clause = '';
		$post_type_filter = filter_input( INPUT_GET, 'post_type_filter' );

		if ( ! empty( $post_type_filter ) && get_post_type_object( sanitize_text_field( $post_type_filter ) ) ) {
			$post_types       = esc_sql( sanitize_text_field( $post_type_filter ) );
			$post_type_clause = "AND post_type IN ('{$post_types}')";
		}

		return $post_type_clause;
	}

	/**
	 * Setting the pagination.
	 *
	 * Total items is the number of all visible items.
	 *
	 * @param int $total_items
	 */
	protected function set_pagination( $total_items ) {

		// Calculate items per page
		$per_page = $this->get_items_per_page( 'wpseo_posts_per_page', 10 );
		$paged    = esc_sql( sanitize_text_field( filter_input( INPUT_GET, 'paged' ) ) );

		if ( empty( $paged ) || ! is_numeric( $paged ) || $paged <= 0 ) {
			$paged = 1;
		}

		$this->set_pagination_args(
			array(
				'total_items' => $total_items,
				'total_pages' => ceil( $total_items / $per_page ),
				'per_page'    => $per_page,
			)
		);

		$this->pagination = array(
			'per_page' => $per_page,
			'offset'   => ( $paged - 1 ) * $per_page,
		);

	}

	/**
	 * Parse the query to get items from database.
	 *
	 * Based on given parameters there will be parse a query which will get all the pages/posts and other post_types
	 * from the database.
	 *
	 * @param string $subquery
	 * @param string $all_states
	 * @param string $post_type_clause
	 *
	 * @return string
	 */
	protected function parse_item_query( $subquery, $all_states, $post_type_clause ) {
		// Order By block
		$orderby = filter_input( INPUT_GET, 'orderby' );

		$orderby = ! empty( $orderby ) ? esc_sql( sanitize_text_field( $orderby ) ) : 'post_title';
		$orderby = $this->sanitize_orderby( $orderby );

		// Order clause
		$order = filter_input( INPUT_GET, 'order' );
		$order = ! empty( $order ) ? esc_sql( strtoupper( sanitize_text_field( $order ) ) ) : 'ASC';
		$order = $this->sanitize_order( $order );

		// Get all needed results
		$query = "
				SELECT ID, post_title, post_type, post_status, post_modified, post_date
				FROM {$subquery}
				WHERE post_status IN ({$all_states}) $post_type_clause
				ORDER BY {$orderby} {$order}
				LIMIT %d,%d
			";

		return $query;
	}

	/**
	 * Heavily restricts the possible columns by which a user can order the table in the bulk editor, thereby preventing a possible CSRF vulnerability.
	 *
	 * @param string $orderby The column by which we want to order
	 *
	 * @return string $orderby
	 */
	protected function sanitize_orderby( $orderby ) {
		$valid_column_names = array(
			'post_title',
			'post_type',
			'post_date',
		);

		if ( in_array( $orderby, $valid_column_names ) ) {
			return $orderby;
		}

		return 'post_title';
	}

	/**
	 * Makes sure the order clause is always ASC or DESC for the bulk editor table, thereby preventing a possible CSRF vulnerability.
	 *
	 * @param string $order Whether we want to sort ascending or descending
	 *
	 * @return string $order
	 */
	protected function sanitize_order( $order ) {
		if ( in_array( strtoupper( $order ), array( 'ASC', 'DESC' ) ) ) {
			return $order;
		}

		return 'ASC';
	}

	/**
	 * Getting all the items.
	 *
	 * @param string $query
	 */
	protected function get_items( $query ) {
		global $wpdb;

		$this->items = $wpdb->get_results(
			$wpdb->prepare(
				$query,
				$this->pagination['offset'],
				$this->pagination['per_page']
			)
		);
	}

	/**
	 * Getting all the states.
	 *
	 * @return string
	 */
	protected function get_all_states() {
		$states          = get_post_stati( array( 'show_in_admin_all_list' => true ) );
		$states['trash'] = 'trash';

		if ( ! empty( $_GET['post_status'] ) ) {
			$requested_state = sanitize_text_field( $_GET['post_status'] );
			if ( in_array( $requested_state, $states ) ) {
				$states = array( $requested_state );
			}
		}

		$states     = esc_sql( $states );
		$all_states = "'" . implode( "', '", $states ) . "'";

		return $all_states;
	}


	/**
	 * Based on $this->items and the defined columns, the table rows will be displayed.
	 */
	function display_rows() {

		$records = $this->items;

		list( $columns, $hidden ) = $this->get_column_info();

		if ( ( is_array( $records ) && $records !== array() ) && ( is_array( $columns ) && $columns !== array() ) ) {

			foreach ( $records as $rec ) {

				echo '<tr id="record_', $rec->ID, '">';

				foreach ( $columns as $column_name => $column_display_name ) {

					$attributes = $this->column_attributes( $column_name, $hidden );

					$column_value = $this->parse_column( $column_name, $rec );

					if ( method_exists( $this, 'parse_page_specific_column' ) && empty( $column_value ) ) {
						$column_value = $this->parse_page_specific_column( $column_name, $rec, $attributes );
					}

					if ( ! empty( $column_value ) ) {
						echo sprintf( '<td %2$s>%1$s</td>', $column_value, $attributes );
					}
				}

				echo '</tr>';
			}
		}
	}

	/**
	 * Getting the attributes for each table cell.
	 *
	 * @param string $column_name
	 * @param string $hidden
	 *
	 * @return string
	 */
	protected function column_attributes( $column_name, $hidden ) {

		$class = sprintf( 'class="%1$s column-%1$s"', $column_name );
		$style = '';

		if ( in_array( $column_name, $hidden ) ) {
			$style = ' style="display:none;"';
		}

		$attributes = $class . $style;

		return $attributes;
	}

	/**
	 * Parsing the title.
	 *
	 * @param object $rec
	 *
	 * @return string
	 */
	protected function parse_page_title_column( $rec ) {

		$return = sprintf( '<strong>%1$s</strong>', stripslashes( wp_strip_all_tags( $rec->post_title ) ) );

		$post_type_object = get_post_type_object( $rec->post_type );
		$can_edit_post    = current_user_can( $post_type_object->cap->edit_post, $rec->ID );

		$actions = array();

		if ( $can_edit_post && 'trash' !== $rec->post_status ) {
			$actions['edit'] = '<a href="' . esc_url( get_edit_post_link( $rec->ID, true ) ) . '" title="' . esc_attr( __( 'Edit this item', 'wordpress-seo' ) ) . '">' . __( 'Edit', 'wordpress-seo' ) . '</a>';
		}

		if ( $post_type_object->public ) {
			if ( in_array( $rec->post_status, array( 'pending', 'draft', 'future' ) ) ) {
				if ( $can_edit_post ) {
					$actions['view'] = '<a href="' . esc_url( add_query_arg( 'preview', 'true', get_permalink( $rec->ID ) ) ) . '" title="' . esc_attr( sprintf( __( 'Preview &#8220;%s&#8221;', 'wordpress-seo' ), $rec->post_title ) ) . '">' . __( 'Preview', 'wordpress-seo' ) . '</a>';
				}
			}
			elseif ( 'trash' !== $rec->post_status ) {
				$actions['view'] = '<a href="' . esc_url( get_permalink( $rec->ID ) ) . '" title="' . esc_attr( sprintf( __( 'View &#8220;%s&#8221;', 'wordpress-seo' ), $rec->post_title ) ) . '" rel="bookmark">' . __( 'View', 'wordpress-seo' ) . '</a>';
			}
		}

		$return .= $this->row_actions( $actions );

		return $return;

	}

	/**
	 * Parsing the column based on the $column_name.
	 *
	 * @param string    $column_name
	 * @param stdobject $rec
	 *
	 * @return string
	 */
	protected function parse_column( $column_name, $rec ) {

		static $date_format;

		if ( $date_format == null ) {
			$date_format = get_option( 'date_format' );
		}

		switch ( $column_name ) {
			case 'col_page_title':
				$column_value = $this->parse_page_title_column( $rec );
				break;

			case 'col_page_slug':
				$permalink    = get_permalink( $rec->ID );
				$display_slug = str_replace( get_bloginfo( 'url' ), '', $permalink );
				$column_value = sprintf( '<a href="%2$s" target="_blank">%1$s</a>', stripslashes( $display_slug ), esc_url( $permalink ) );
				break;

			case 'col_post_type':
				$post_type    = get_post_type_object( $rec->post_type );
				$column_value = $post_type->labels->singular_name;
				break;

			case 'col_post_status':
				$post_status  = get_post_status_object( $rec->post_status );
				$column_value = $post_status->label;
				break;

			case 'col_post_date':
				$column_value = date_i18n( $date_format, strtotime( $rec->post_date ) );
				break;

			case 'col_row_action':
				$column_value = sprintf( '<a href="#" class="wpseo-save" data-id="%1$s">Save</a> | <a href="#" class="wpseo-save-all">Save All</a>', $rec->ID );
				break;
		}

		if ( ! empty( $column_value ) ) {
			return $column_value;
		}
	}

	/**
	 * Parse the field where the existing meta-data value is displayed.
	 *
	 * @param integer    $record_id
	 * @param string     $attributes
	 * @param bool|array $values
	 *
	 * @return string
	 */
	protected function parse_meta_data_field( $record_id, $attributes, $values = false ) {

		// Fill meta data if exists in $this->meta_data
		$meta_data  = ( ! empty( $this->meta_data[ $record_id ] ) ) ? $this->meta_data[ $record_id ] : array();
		$meta_key   = WPSEO_Meta::$meta_prefix . $this->target_db_field;
		$meta_value = ( ! empty( $meta_data[ $meta_key ] ) ) ? $meta_data[ $meta_key ] : '';

		if ( ! empty( $values ) ) {
			$meta_value = $values[ $meta_value ];
		}

		return sprintf( '<td %2$s id="wpseo-existing-%4$s-%3$s">%1$s</td>', $meta_value, $attributes, $record_id, $this->target_db_field );
	}

	/**
	 * Method for setting the meta data, which belongs to the records that will be shown on the current page.
	 *
	 * This method will loop through the current items ($this->items) for getting the post_id. With this data
	 * ($needed_ids) the method will query the meta-data table for getting the title.
	 */
	protected function get_meta_data() {

		$post_ids  = $this->get_post_ids();
		$meta_data = $this->get_meta_data_result( $post_ids );

		$this->parse_meta_data( $meta_data );

		// Little housekeeping
		unset( $post_ids, $meta_data );

	}

	/**
	 * Getting all post_ids from to $this->items.
	 *
	 * @return string
	 */
	protected function get_post_ids() {
		$needed_ids = array();
		foreach ( $this->items as $item ) {
			$needed_ids[] = $item->ID;
		}

		$post_ids = "'" . implode( "', '", $needed_ids ) . "'";

		return $post_ids;
	}

	/**
	 * Getting the meta_data from database.
	 *
	 * @param string $post_ids
	 *
	 * @return mixed
	 */
	protected function get_meta_data_result( $post_ids ) {
		global $wpdb;

		$meta_data = $wpdb->get_results(
			"
				 	SELECT *
				 	FROM {$wpdb->postmeta}
				 	WHERE post_id IN({$post_ids}) && meta_key = '" . WPSEO_Meta::$meta_prefix . $this->target_db_field . "'
				"
		);

		return $meta_data;
	}

	/**
	 * Setting $this->meta_data.
	 *
	 * @param array $meta_data
	 */
	protected function parse_meta_data( $meta_data ) {

		foreach ( $meta_data as $row ) {
			$this->meta_data[ $row->post_id ][ $row->meta_key ] = $row->meta_value;
		}

	}

	/**
	 * This method will merge general array with given parameter $columns.
	 *
	 * @param array $columns
	 *
	 * @return array
	 */
	protected function merge_columns( $columns = array() ) {
		$columns = array_merge(
			array(
				'col_page_title'  => __( 'WP Page Title', 'wordpress-seo' ),
				'col_post_type'   => __( 'Post Type', 'wordpress-seo' ),
				'col_post_status' => __( 'Post Status', 'wordpress-seo' ),
				'col_post_date'   => __( 'Publication date', 'wordpress-seo' ),
				'col_page_slug'   => __( 'Page URL/Slug', 'wordpress-seo' ),
			),
			$columns
		);

		$columns['col_row_action'] = __( 'Action', 'wordpress-seo' );

		return $columns;
	}

} /* End of class */

wordpress-seo.admin.class-metabox.php

/**
 * Sets up all the functionality related to the prominence of the page analysis functionality.
 */
public function setup_page_analysis() {
	if ( apply_filters( 'wpseo_use_page_analysis', true ) === true ) {
		$post_types = get_post_types( array( 'public' => true ), 'names' );
		if ( is_array( $post_types ) && $post_types !== array() ) {
			foreach ( $post_types as $pt ) {
				if ( $this->is_metabox_hidden( $pt ) === false ) {
					add_filter( 'manage_' . $pt . '_posts_columns', array( $this, 'column_heading' ), 10, 1 );
					add_action( 'manage_' . $pt . '_posts_custom_column', array(
						$this,
						'column_content',
					), 10, 2 );
					add_action( 'manage_edit-' . $pt . '_sortable_columns', array(
						$this,
						'column_sort',
					), 10, 2 );
				}
			}
			unset( $pt );
		}
		add_action( 'restrict_manage_posts', array( $this, 'posts_filter_dropdown' ) );
		add_filter( 'request', array( $this, 'column_sort_orderby' ) );
		add_action( 'post_submitbox_misc_actions', array( $this, 'publish_box' ) );
	}
}