Fix regular expression used for opclasses to not be confused by partial index clause

config/initializers/postgresql_opclasses_support.rb

@@ -127,7 +127,7 @@ module ActiveRecord
               orders = desc_order_columns.any? ? Hash[desc_order_columns.map {|order_column| [order_column, :desc]}] : {}
               where = inddef.scan(/WHERE (.+)$/).flatten[0]
               using = inddef.scan(/USING (.+?) /).flatten[0].to_sym
-              opclasses = Hash[inddef.scan(/\((.+)\)$/).flatten[0].split(',').map do |column_and_opclass|
+              opclasses = Hash[inddef.scan(/\((.+?)\)(?:$| WHERE )/).flatten[0].split(',').map do |column_and_opclass|
                                  column, opclass = column_and_opclass.split(' ').map(&:strip)
                                  [column, opclass] if opclass
                                end.compact]

db/schema.rb

@@ -256,7 +256,7 @@ ActiveRecord::Schema.define(version: 20170914135630) do
   add_index "ci_builds", ["commit_id", "status", "type"], name: "index_ci_builds_on_commit_id_and_status_and_type", using: :btree
   add_index "ci_builds", ["commit_id", "type", "name", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_name_and_ref", using: :btree
   add_index "ci_builds", ["commit_id", "type", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_ref", using: :btree
-  add_index "ci_builds", ["id"], name: "index_for_ci_builds_retried_migration", where: "(retried IS NULL)", using: :btree, opclasses: {"id)"=>"WHERE"}
+  add_index "ci_builds", ["id"], name: "index_for_ci_builds_retried_migration", where: "(retried IS NULL)", using: :btree
   add_index "ci_builds", ["project_id"], name: "index_ci_builds_on_project_id", using: :btree
   add_index "ci_builds", ["protected"], name: "index_ci_builds_on_protected", using: :btree
   add_index "ci_builds", ["runner_id"], name: "index_ci_builds_on_runner_id", using: :btree