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= New Features
* Sequel::DEFAULT has been added a constant for the DEFAULT expression,
useful in inserts and especially updates:
DB[:a].where(:id=>1).update(:b=>Sequel::DEFAULT)
# UPDATE "a" SET "b" = DEFAULT WHERE "id" = 1
* SQL::Function#filter for filtered aggregate functions is now
supported on all databases. On databases not supporting it natively
(all except PostgreSQL 9.4+ and SQLite 3.30+), a CASE statement is
used to emulate the support.
= Other Improvements
* NULLS FIRST/LAST is now used without emulation on SQLite 3.30+.
* The pg_enum extension now works correctly on PostgreSQL 8.3-9.0.
* Postgres::ArrayOp#join in the pg_array_ops extension now works
correctly on PostgreSQL <9.1.
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