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== 2.2.1 / 2011-09-15
* Enhancements
* Added UpdateManager#key to access the key value
* Added SelectManager#projections= to override any existing projections
* Added SelectManager#source to get the source of the last select core in the AST
== 2.2.0 / 2011-08-09
* Bug Fixes
* The database connection caches visitors for generating SQL.
* FALSE and TRUE nodes can be constructed.
* Fixed ORDER BY / LIMIT clauses for UPDATE statements in Oracle.
== 2.1.4 / 2011-07-25
* Bug Fixes
* Fix depth-first traversal to understand ascending / descending nodes.
* Parentheis are suppressed with nested unions in MySQL. Thanks jhtwong!
== 2.1.3 / 2011-06-27
* Bug Fixues
* Fixed broken gem build.
== 2.1.2 / 2011-06-27
* Bug Fixes
* Visitors can define their own cache strategey so caches are not shared.
Fixes #57
* Informix support fixed. Thanks Khronos.
* Ordering nodes broken to subclasses. Thanks Ernie Miller!
* Reversal supported in ordering nodes. Thanks Ernie Miller!
== 2.1.1 / 2011/05/14
* Bug fixes
* Fixed thread safety bug in ToSql visitor. Thanks Damon McCormick and
Cameron Walters!
== 2.1.0 / 2011/04/30
* Enhancements
* AST is now Enumerable
* AND nodes are now n-ary nodes
* SQL Literals may be used as Attribute names
* Added Arel::Nodes::NamedFunction for representing generic SQL functions
* Add Arel::SelectManager#limit=
* Add Arel::SelectManager#offset
* Add Arel::SelectManager#offset=
* Added Arel::SelectManager#create_insert for building an insert manager.
* SQL Literals are allowed for values in INSERT statements.
* Math operations have been added to attributes, thanks to
Vladimir Meremyanin.
* Bug fixes
* MSSQL adds TOP to sub selects
* Assigning nil to take() removes LIMIT from statement.
* Assigning nil to offset() removes OFFSET from statement.
* TableAlias leg ordering fixed
* Deprecations
* Calls to `insert` are deprecated. Please use `compile_insert` then call
`to_sql` on the resulting object and execute that SQL.
* Calls to `update` are deprecated. Please use `compile_update` then call
`to_sql` on the resulting object and execute that SQL.
* Calls to `delete` are deprecated. Please use `compile_delete` then call
`to_sql` on the resulting object and execute that SQL.
* Arel::Table#joins is deprecated and will be removed in 3.0.0 with no
replacement.
* Arel::Table#columns is deprecated and will be removed in 3.0.0 with no
replacement.
* Arel::Table.table_cache is deprecated and will be removed in 3.0.0 with no
replacement.
* Arel::Nodes::And.new takes a single list instead of left and right.
* Arel::Table#primary_key is deprecated and will be removed in 3.0.0 with no
replacement.
* Arel::SelectManager#where_clauses is deprecated and will be removed in
3.0.0 with no replacement.
* Arel::SelectManager#wheres is deprecated and will be removed in
3.0.0 with no replacement.
== 2.0.9 / 2010/02/25
* Bug Fixes
* Custom LOCK strings are allowed. Fixes LH # 6399
https://rails.lighthouseapp.com/projects/8994/tickets/6399-allow-database-specific-locking-clauses-to-be-used
* Strings passed to StringManager#on will be automatically tagged as SQL
literals. Fixes Rails LH #6384
https://rails.lighthouseapp.com/projects/8994/tickets/6384-activerecord-303-and-3-0-stable-generate-invalid-sql-for-has_many-through-association-with-conditions
== 2.0.8 / 2010/02/08
* Bug Fixes
* Added set operation support
* Fixed problems with *_any / *_all methods.
== 2.0.7
* Bug Fixes
* Limit members are visited
* Fixing MSSQL TOP support
== 2.0.6 12/01/2010
* Bug Fixes
* Rails 3.0.x does not like that Node is Enumerable, so removing for now.
== 2.0.5 11/30/2010
* Enhancements
* Arel::Visitors::DepthFirst can walk your AST depth first
* Arel::Nodes::Node is enumerable, depth first
* Bug fixes
* #lock will lock SELECT statements "FOR UPDATE" on mysql
* Nodes::Node#not factory method added for creating Nodes::Not nodes
* Added an As node
* Deprecations
* Support for Subclasses of core classes will be removed in Arel version
2.2.0
== 2.0.4
* Bug fixes
* Speed improvements for Range queries. Thanks Rolf Timmermans!
== 2.0.3
* Bug fixes
* Fixing Oracle support
* Added a visitor for "Class" objects
== 2.0.2
* Bug fixes
* MySQL selects from DUAL on empty FROM
* Visitor translates nil to NULL
* Visitor translates Bignum properly
== 2.0.1
* Bug fixes
== 2.0.0 / 2010-08-01
* Enhancements
* Recreate library using the Visitor pattern.
http://en.wikipedia.org/wiki/Visitor_pattern
== 0.3.0 / 2010-03-10
* Enhancements
* Introduced "SQL compilers" for query generation.
* Added support for Oracle (Raimonds Simanovskis) and IBM/DB (Praveen Devarao).
* Improvements to give better support to Active Record.
== 0.2.1 / 2010-02-05
* Enhancements
* Bump dependency version of activesupport to 3.0.0.beta
== 0.2.0 / 2010-01-31
* Ruby 1.9 compatibility
* Many improvements to support the Arel integration into Active Record (see `git log v0.1.0..v0.2.0`)
* Thanks to Emilio Tagua and Pratik Naik for many significant contributions!
== 0.1.0 / 2009-08-06
* 1 major enhancement
* Birthday!
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