Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 1)
     Asterisk
    TablesInSelectQuery (children 2)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier t1_00826
     TablesInSelectQueryElement (children 2)
      TableExpression (children 1)
       TableIdentifier t2_00826
      TableJoin
    Function and (children 1)
     ExpressionList (children 2)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t1_00826.a
        Identifier t2_00826.a
      Function and (children 1)
       ExpressionList (children 2)
        Function equals (children 1)
         ExpressionList (children 2)
          Identifier t1_00826.a
          Identifier t2_00826.a
        Function and (children 1)
         ExpressionList (children 2)
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1_00826.a
            Identifier t2_00826.a
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1_00826.b
            Identifier t2_00826.b
    ExpressionList (children 1)
     OrderByElement (children 1)
      Identifier all
