SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 4)
    Identifier t1.id (alias t1_id)
    Identifier t2.id (alias t2_id)
    Identifier t1._sample_factor (alias t1_sample_factor)
    Identifier t2._sample_factor (alias t2_sample_factor)
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 2)
      TableIdentifier test_table_join_1 (alias t1)
      SampleRatio 1 / 2
    TablesInSelectQueryElement (children 2)
     TableExpression (children 2)
      TableIdentifier test_table_join_2 (alias t2)
      SampleRatio 1 / 2
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t1.id
        Identifier t2.id
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier ALL