SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier A (alias a)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier A (alias b)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier a.A
        Identifier b.A
   Literal UInt64_1
 Identifier Null
