{
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    'sub_nodes' => [
        {
            'scan_on' => {
                'table_alias' => 'pg_class',
                'table_alias' => 'pg_class',
                'table_alias' => 'pg_class',
                'table_alias' => 'pg_class',
                'table_name' => 'pg_class'
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            'estimated_startup_cost' => '0',
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            'type' => 'Seq Scan',
            'actual_loops' => '1'
        }
    ],
    'type' => 'Limit',
    'actual_loops' => '1'
}