SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 6)
    Literal UInt64_1
    Literal \'a\'
    Literal Array_[UInt64_1, UInt64_2, UInt64_3]
    Literal Tuple_(UInt64_1, \'a\')
    Literal NULL
    Literal Float64_nan
 Identifier JSONCompactStrings