DescribeQuery (children 1)
 TableExpression (children 1)
  Subquery (children 1)
   SelectWithUnionQuery (children 1)
    ExpressionList (children 1)
     SelectQuery (children 2)
      ExpressionList (children 6)
       Identifier test_table_join_1.id
       Identifier test_table_join_1.value
       Identifier test_table_join_1.value_join_1
       Identifier test_table_join_2.id
       Identifier test_table_join_2.value
       Identifier test_table_join_2.value_join_2
      TablesInSelectQuery (children 2)
       TablesInSelectQueryElement (children 1)
        TableExpression (children 1)
         TableIdentifier test_table_join_1 (alias t1)
       TablesInSelectQueryElement (children 2)
        TableExpression (children 1)
         TableIdentifier test_table_join_2 (alias t2)
        TableJoin (children 1)
         Function equals (children 1)
          ExpressionList (children 2)
           Identifier t1.id
           Identifier t2.id