attributes_list ) );
			foreach ( $any_attributes as $attributes_data ) {
				foreach ( $attributes_data as $attribute_data ) {
					$insert_data[] = array( $variation_id, $main_product_id, $attribute_data['attribute'], $attribute_data['term_id'], 1, $product_ids_with_stock_status[ $variation_id ] ?? false );
				}
			}
		}

		// * Insert data for variations that have all their attributes defined as "any..."

		$variations_with_all_any = array_keys( array_diff_key( array_flip( $variation_ids ), $used_attributes_per_variation ) );
		foreach ( $variations_with_all_any as $variation_id ) {
			foreach ( $terms_used_per_attribute as $attribute_name => $attribute_terms ) {
				foreach ( $attribute_terms as $attribute_term ) {
					$insert_data[] = array( $variation_id, $main_product_id, $attribute_name, $attribute_term['term_id'], 1, $product_ids_with_stock_status[ $variation_id ] ?? false );
				}
			}
		}

		// * We have all the data to insert, let's go and insert it.

		$insert_data_chunks = array_chunk( $insert_data, 100 );
		foreach ( $insert_data_chunks as $insert_data_chunk ) {
			$sql = 'INSERT INTO ' . $this->lookup_table_name . ' (
					  product_id,
					  product_or_parent_id,
					  taxonomy,
					  term_id,
					  is_variation_attribute,
					  in_stock)
					VALUES (';

			$values_strings = array();
			foreach ( $insert_data_chunk as $dataset ) {
				$attribute_name   = esc_sql( $dataset[2] );
				$values_strings[] = "{$dataset[0]},{$dataset[1]},'{$attribute_name}',{$dataset[3]},{$dataset[4]},{$dataset[5]}";
			}

			$sql .= implode( '),(', $values_strings ) . ')';

			// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
			$result = $wpdb->query( $sql );
			if ( false === $result ) {
				throw new \WC_Data_Exception(
					0,
					'INSERT statement failed',
					0,
					array(
						'db_error' => esc_html( $wpdb->last_error ),
						'db_query' => esc_html( $wpdb->last_query ),
					)
				);
			}
		}
	}
}