SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 5)
    Literal \'Hello, "World"\' (alias x)
    Literal UInt64_123 (alias y)
    Literal Array_[UInt64_1, UInt64_2, UInt64_3] (alias z)
    Function tuple (alias a) (children 1)
     ExpressionList (children 2)
      Literal UInt64_456
      Literal Array_[\'abc\', \'def\']
    Literal \'Newline\\nhere\' (alias b)
 Identifier CSVWithNamesAndTypes