DescribeQuery (children 1)
 TableExpression (children 1)
  Function format (children 1)
   ExpressionList (children 3)
    Identifier CSV
    Literal \'a1 Int32, a2 UInt64, a3 Array(Int32), a4 Array(Array(String))\'
    Literal \'1,2,"[1,2,3]","[[\\\'abc\\\'], [], [\\\'d\\\', \\\'e\\\']]"\'
