1 files changed, 17 insertions, 0 deletions
diff --git a/db/migrate/20201202161021_remove_redundant_index_on_merge_request_context_commit_diff_files.rb b/db/migrate/20201202161021_remove_redundant_index_on_merge_request_context_commit_diff_files.rb
new file mode 100644
index 00000000000..a9c0a079955
--- /dev/null
+++ b/db/migrate/20201202161021_remove_redundant_index_on_merge_request_context_commit_diff_files.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class RemoveRedundantIndexOnMergeRequestContextCommitDiffFiles < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index_by_name :merge_request_context_commit_diff_files, 'idx_mr_cc_diff_files_on_mr_cc_id'
+  end
+
+  def down
+    # no-op: this index is not tracked in structure.sql, and is redundant due to idx_mr_cc_diff_files_on_mr_cc_id_and_sha
+  end
+end