framework/db/ActiveRecord.php
protected static function filterValidAliases(Query $query)
    {
        $tables = $query->getTablesUsedInFrom();

        $aliases = array_diff(array_keys($tables), $tables);

        return array_map(function ($alias) {
            return preg_replace('/{{([\w]+)}}/', '$1', $alias);
        }, array_values($aliases));
    }
protected static function filterValidAliases(Query $query)
    {
        $tables = $query->getTablesUsedInFrom();

        $aliases = array_diff(array_keys($tables), $tables);

        return array_map(function ($alias) {
            return preg_replace('/{{([\w]+)}}/', '$1', $alias);
        }, array_values($aliases));
    }
Returns table aliases which are not the same as the name of the tables.

@param Query $query
@return array
@throws InvalidConfigException
@since 2.0.17
@internal