This file has been removed in rails4 branch at 9369d15
"Initial support for ActiveRecord 4. Dropping support for older versions."
Several changes done with 3fad716c0132af0e833b2da26738642500326408 are
merged to `lib/active_record/connection_adapters/oracle_enhanced_model.rb`
These two commits at master branch conflict with 166bcb2
-- Two commits at master branch
"Remove_column should raise an ArgumentError when no columns are passed"
"Fix broken column remove inside a change_table block."
-- A commit at rails4 branch
"Support refactored remove_column"
This commit done at master branch conflict with rails4.
"Fix pending specs on Oracle 10g properly"