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 2)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_1 (alias id)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_2
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier id
      Literal UInt64_1
