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.
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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