SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayCompact (children 1)
     ExpressionList (children 1)
      Literal Array_[UInt64_1, UInt64_1, Float64_nan, Float64_nan, UInt64_2, UInt64_2, UInt64_2]