Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Identifier id
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Function arrayJoin (alias id) (children 1)
             ExpressionList (children 1)
              Literal Array_[UInt64_1, UInt64_2, UInt64_3]
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier id
      Literal UInt64_1
