DescribeQuery (children 1)
 TableExpression (children 1)
  Function s3Cluster (children 1)
   ExpressionList (children 6)
    Literal \'test_cluster_one_shard_three_replicas_localhost\'
    Literal \'http://localhost:11111/test/{a,b}.tsv\'
    Literal \'TSV\'
    Literal \'auto\'
    Function headers (children 1)
     ExpressionList (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier MyCustomHeader
        Literal \'SomeValue\'
    Literal \'auto\'
