Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Asterisk
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 2)
           ExpressionList (children 2)
            Function toUInt64 (alias a) (children 1)
             ExpressionList (children 1)
              Identifier b
            Function sum (alias b) (children 1)
             ExpressionList (children 1)
              Identifier id
           TablesInSelectQuery (children 1)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              TableIdentifier test_00597
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier a
      Literal UInt64_3
