Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Identifier b.value
    TablesInSelectQuery (children 2)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Function toInt8 (alias id) (children 1)
             ExpressionList (children 1)
              Literal UInt64_1
     TablesInSelectQueryElement (children 2)
      TableExpression (children 1)
       TableIdentifier test_00597 (alias b)
      TableJoin (children 1)
       ExpressionList (children 1)
        Identifier id
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier value
      Literal UInt64_1
