Log Message:
Update ruby-sequel to 3.38.0.

=== 3.38.0 (2012-08-01)

* Sequel now recognizes the double(x, y) and double(x, y) unsigned MySQL types
  (Slike9, jeremyevans) (#528)

* The swift subadapters now require swift-db-* instead of swift itself
  (deepfryed, jeremyevans) (#526)

* Add :textsize option to tinytds adapter to override the default TEXTSIZE
  (jeremyevans, wardrop) (#525)

* Support an output identifier method in the swift adapter (jeremyevans)

* Add Model#to_hash as an alias to Model#values (jeremyevans)

* When loading multiple pg_* extensions via Database#extension, only reset the
  conversion procs once (jeremyevans)

* Don't allow model typecasting from string to postgres array, hstore, or
  composite types (jeremyevans)

* Add pg_typecast_on_load plugin for converting advanced PostgreSQL types on
  load the {jdbc,do,swift}/postgres adapters (jeremyevans)

* Make all adapters that connect to PostgreSQL store type conversion procs
  (jeremyevans)

* Add type oid to column schema on PostgreSQL (jeremyevans)

* Add pg_row plugin, for using Sequel::Model classes to represent PostgreSQL
  row-valued/composite types (jeremyevans)

* Add pg_row_ops extension for DSL support for PostgreSQL row-valued/composite
  types (jeremyevans)

* Add pg_row extension for dealing with PostgreSQL row-valued/composite types
  (jeremyevans)

* Allow custom registered array types in the pg_array extension to be Database
  instance specific (jeremyevans)

* Remove Sequel::SQL::IdentifierMethods (jeremyevans)

* Don't have the schema_dumper extension produce code that relies on the
  core_extensions (jeremyevans)

* Fix dropping of columns with constraints on Microsoft SQL Server (mluu,
  jeremyevans) (#515, #518)

* Don't have pg_* extensions add methods to core classes unless the
  core_extensions extension is loaded (jeremyevans)

* Use real boolean literals on derby 10.7+ (jeremyevans, matthauck) (#514)

* Work around JRuby 1.6 ruby 1.9 mode bug in Time#nsec for Time prepared
  statement arguments on jdbc (jeremyevans)

* Handle blob prepared statement arguments on jdbc/db2 and jdbc/oracle
  (jeremyevans)

* Handle blob values in the swift adapter (jeremyevans)

* Handle better nil prepared statement arguments on jdbc (jeremyevans) (#513)

* Make SQL::Blob objects handle as, cast, and lit methods even if the core
  extensions are not loaded (jeremyevans)

* Make #* with no arguments produce a ColumnAll for Identifier and
  QualifiedIdentifier (jeremyevans)

* Sequel.expr(:symbol) now returns Identifier, QualifiedIdentifier, or
  AliasedExpression instead of Wrapper (jeremyevans)

* Treat clob columns as string instead of blob on Derby (jeremyevans) (#509)