Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Identifier d0.id
    TablesInSelectQuery (children 2)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier t1_distr (alias d0)
     TablesInSelectQueryElement (children 2)
      TableExpression (children 1)
       Subquery (alias s0) (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 4)
           ExpressionList (children 1)
            Identifier d1.id
           TablesInSelectQuery (children 2)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              TableIdentifier t1_distr (alias d1)
            TablesInSelectQueryElement (children 2)
             TableExpression (children 1)
              TableIdentifier t2_distr (alias d2)
             TableJoin (children 1)
              Function equals (children 1)
               ExpressionList (children 2)
                Identifier d1.id
                Identifier d2.id
           Function greater (children 1)
            ExpressionList (children 2)
             Identifier d1.id
             Literal UInt64_0
           ExpressionList (children 1)
            OrderByElement (children 1)
             Identifier d1.id
      TableJoin (children 1)
       ExpressionList (children 1)
        Identifier id
