Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectIntersectExceptQuery (children 2)
    SelectWithUnionQuery (children 1)
     ExpressionList (children 1)
      SelectQuery (children 1)
       ExpressionList (children 1)
        Literal UInt64_1
    SelectQuery (children 1)
     ExpressionList (children 1)
      Literal UInt64_1
