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= New Features
* Model#qualified_pk_hash has been added, which is similar to
Model#pk_hash, but uses qualified keys.
* Dataset#distinct now accepts a virtual row block.
* Database#drop_table with :foreign=>true option now drops foreign
tables on PostgreSQL. Database#create_table with :foreign option
is now reversible on PostgreSQL.
= Other Improvements
* Sequel::Model.cache_associations = false now skips the database's
schema cache when loading the schema for a model. This fixes
some issues in environments that use code reloading.
* Database#create_table? and #create_join_table? no longer use
IF NOT EXISTS if indexes are being created.
* Model.primary_key_hash and .qualified_primary_key_hash have been
optimized.
* validates_unique in the validation_helpers plugin now uses a
qualified primary key if the model's dataset is joined. This fixes
a case when the auto_validations and class_table_inheritance
plugins are used together.
* Disconnect errors are now recognized in the postgres adapter when
SSL is used for connecting.
* Empty string default values are no longer converted to nil default
values on MySQL.
* Database#foreign_key_list now works correctly on Microsoft SQL
Server 2005.
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