# 0.9.1 / 2011.07.13

* Enhancements (public APIs)

  * Added the in-memory Alf::Relation data structure and associated tooling.
    This allows using Alf in a object-oriented usual way, in addition to the
    functional DSL:
    
        Alf.lispy.evaluate {
          (join (restrict :suppliers, lambda{ status > 10 }), :cities)
        }
    
    is equivalent to
    
        suppliers, cities = [...], [...] 
        suppliers.restrict(lambda{ status > 10 }).join(cities)
        
    see README about how to obtain suppliers and cities relations in the first 
    place.
  
  * Summarize now accepts a --allbut option, to specify 'by' attributes from an
    exclusion perspective

  * .alf files are now evaluated in such a way that backtraces are "traceability
    friendly"

* Non backward-compatible changes to public APIs

  * Lispy#with has been removed because not being stable enough. The clean way 
    of reusing sub-queries is as follows (non purely functional, so far)
    
        kept_suppliers = (restrict :suppliers, lambda{ status > 10 })
        with_countries = (join kept_suppliers, :cities)
        supplying      = (join with_countries, :supplies)
        (summarize supplying,
                   [:country],
                   :which => Agg::group(:pid),
                   :total => Agg::sum{ qty })
                   
  * As a consequence, named data sources (Symbols, like :suppliers above) are 
    now resolved at compile time, which is less powerful, yet much simpler and
    sound.

  * Nest and Unnest have been renamed to Wrap and Unwrap respectively. This is
    to better conform to TUTORIAL D's terminology.
    
  * Lispy#chain was kept public in 0.9.0 by error and has been entirely removed 
    from the DSL.

* Enhancements (internals)

  * Reader.reader delegates to Reader.coerce when its first argument is not 
    a String. This allows calling Reader.reader(args.first || $stdin) in quickl
    commands for example.
    
  * Operator, Operator::Relational and Operator::NonRelational have a .each 
    class method that yields operator classes
    
* Bug fixes

  * Fixed a bug that led to an Nil error when using unary operators on $stdin
  * Fixed a bug when summarizing or sorting on Symbol attributes with ruby 1.8
  * Fixed numerous crashes under rubinius

# 0.9.0 / 2011.06.19

* Enhancements

  * Birthday!