SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Identifier a1
    Identifier copy.a1
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab1
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier tab1_copy (alias copy)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Function plus (children 1)
         ExpressionList (children 2)
          Identifier tab1.b1
          Literal UInt64_3
        Function plus (children 1)
         ExpressionList (children 2)
          Identifier tab1_copy.b1
          Literal UInt64_2
 Identifier JSONEachRow