protected function auto_map_columns( $raw_headers, $num_indexes = true ) {
		$weight_unit    = get_option( 'woocommerce_weight_unit' );
		$dimension_unit = get_option( 'woocommerce_dimension_unit' );

		/*
		 * @hooked wc_importer_generic_mappings - 10
		 * @hooked wc_importer_wordpress_mappings - 10
		 * @hooked wc_importer_default_english_mappings - 100
		 */
		$default_columns = $this->normalize_columns_names(
			apply_filters(
				'woocommerce_csv_product_import_mapping_default_columns',
				array(
					__( 'ID', 'woocommerce' )             => 'id',
					__( 'Type', 'woocommerce' )           => 'type',
					__( 'SKU', 'woocommerce' )            => 'sku',
					__( 'Name', 'woocommerce' )           => 'name',
					__( 'Published', 'woocommerce' )      => 'published',
					__( 'Is featured?', 'woocommerce' )   => 'featured',
					__( 'Visibility in catalog', 'woocommerce' ) => 'catalog_visibility',
					__( 'Short description', 'woocommerce' ) => 'short_description',
					__( 'Description', 'woocommerce' )    => 'description',
					__( 'Date sale price starts', 'woocommerce' ) => 'date_on_sale_from',
					__( 'Date sale price ends', 'woocommerce' ) => 'date_on_sale_to',
					__( 'Tax status', 'woocommerce' )     => 'tax_status',
					__( 'Tax class', 'woocommerce' )      => 'tax_class',
					__( 'In stock?', 'woocommerce' )      => 'stock_status',
					__( 'Stock', 'woocommerce' )          => 'stock_quantity',
					__( 'Backorders allowed?', 'woocommerce' ) => 'backorders',
					__( 'Low stock amount', 'woocommerce' ) => 'low_stock_amount',
					__( 'Sold individually?', 'woocommerce' ) => 'sold_individually',
					/* translators: %s: Weight unit */
					sprintf( __( 'Weight (%s)', 'woocommerce' ), $weight_unit ) => 'weight',
					/* translators: %s: Length unit */
					sprintf( __( 'Length (%s)', 'woocommerce' ), $dimension_unit ) => 'length',
					/* translators: %s: Width unit */
					sprintf( __( 'Width (%s)', 'woocommerce' ), $dimension_unit ) => 'width',
					/* translators: %s: Height unit */
					sprintf( __( 'Height (%s)', 'woocommerce' ), $dimension_unit ) => 'height',
					__( 'Allow customer reviews?', 'woocommerce' ) => 'reviews_allowed',
					__( 'Purchase note', 'woocommerce' )  => 'purchase_note',
					__( 'Sale price', 'woocommerce' )     => 'sale_price',
					__( 'Regular price', 'woocommerce' )  => 'regular_price',
					__( 'Categories', 'woocommerce' )     => 'category_ids',
					__( 'Tags', 'woocommerce' )           => 'tag_ids',
					__( 'Shipping class', 'woocommerce' ) => 'shipping_class_id',
					__( 'Images', 'woocommerce' )         => 'images',
					__( 'Download limit', 'woocommerce' ) => 'download_limit',
					__( 'Download expiry days', 'woocommerce' ) => 'download_expiry',
					__( 'Parent', 'woocommerce' )         => 'parent_id',
					__( 'Upsells', 'woocommerce' )        => 'upsell_ids',
					__( 'Cross-sells', 'woocommerce' )    => 'cross_sell_ids',
					__( 'Grouped products', 'woocommerce' ) => 'grouped_products',
					__( 'External URL', 'woocommerce' )   => 'product_url',
					__( 'Button text', 'woocommerce' )    => 'button_text',
					__( 'Position', 'woocommerce' )       => 'menu_order',
				),
				$raw_headers
			)
		);

		$special_columns = $this->get_special_columns(
			$this->normalize_columns_names(
				apply_filters(
					'woocommerce_csv_product_import_mapping_special_columns',
					array(
						/* translators: %d: Attribute number */
						__( 'Attribute %d name', 'woocommerce' ) => 'attributes:name',
						/* translators: %d: Attribute number */
						__( 'Attribute %d value(s)', 'woocommerce' ) => 'attributes:value',
						/* translators: %d: Attribute number */
						__( 'Attribute %d visible', 'woocommerce' ) => 'attributes:visible',
						/* translators: %d: Attribute number */
						__( 'Attribute %d global', 'woocommerce' ) => 'attributes:taxonomy',
						/* translators: %d: Attribute number */
						__( 'Attribute %d default', 'woocommerce' ) => 'attributes:default',
						/* translators: %d: Download number */
						__( 'Download %d name', 'woocommerce' ) => 'downloads:name',
						/* translators: %d: Download number */
						__( 'Download %d URL', 'woocommerce' ) => 'downloads:url',
						/* translators: %d: Meta number */
						__( 'Meta: %s', 'woocommerce' ) => 'meta:',
					),
					$raw_headers
				)
			)
		);

		$headers = array();
		foreach ( $raw_headers as $key => $field ) {
			$normalized_field  = strtolower( $field );
			$index             = $num_indexes ? $key : $field;
			$headers[ $index ] = $normalized_field;

			if ( isset( $default_columns[ $normalized_field ] ) ) {
				$headers[ $index ] = $default_columns[ $normalized_field ];
			} else {
				foreach ( $special_columns as $regex => $special_key ) {
					// Don't use the normalized field in the regex since meta might be case-sensitive.
					if ( preg_match( $regex, $field, $matches ) ) {
						$headers[ $index ] = $special_key . $matches[1];
						break;
					}
				}
			}
		}

		return apply_filters( 'woocommerce_csv_product_import_mapped_columns', $headers, $raw_headers );
	}