Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 1)
     Function not (children 1)
      ExpressionList (children 1)
       Function not (children 1)
        ExpressionList (children 1)
         Function not (children 1)
          ExpressionList (children 1)
           Function not (children 1)
            ExpressionList (children 1)
             Literal NULL
