Explain EXPLAIN (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 2)
     Identifier id
     Identifier delete_time
    TablesInSelectQuery (children 2)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier t1
     TablesInSelectQueryElement (children 2)
      TableExpression (children 1)
       Subquery (alias d) (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 2)
           ExpressionList (children 1)
            Identifier delete_time
           TablesInSelectQuery (children 1)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              TableIdentifier t2
      TableJoin
    Function and (children 1)
     ExpressionList (children 2)
      Function less (children 1)
       ExpressionList (children 2)
        Identifier create_time
        Identifier delete_time
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier id
        Literal UInt64_101
    Set
