SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function mapFromArrays (children 1)
     ExpressionList (children 2)
      Literal Array_[Array_[UInt64_1, UInt64_2], Array_[UInt64_3, UInt64_4]]
      Literal Array_[UInt64_4, UInt64_5, UInt64_6]