SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function L2Distance (children 1)
     ExpressionList (children 2)
      Literal Array_[UInt64_1, UInt64_2]
      Literal Tuple_(UInt64_3, UInt64_4)