public function __get( $key ) {

		// Handle formerly public properties.
		$legacy_props = $this->legacy_public_props();
		if ( array_key_exists( $key, $legacy_props ) ) {
			$this->public_prop_deprecation( $key );
			$val = $legacy_props[ $key ][0];
			return method_exists( $this, $val ) ? $this->$val() : $this->$val;
		} elseif ( 'sql' === $key ) {
			$class = get_called_class();
			_deprecated_function( "Property {$class}::sql", '6.0.0', "{$class}::get_query()" );
			return $this->query;
		}

	}