1 files changed, 25 insertions, 0 deletions
diff --git a/db/migrate/20220422220507_remove_tmp_index_supporting_leaky_regex_cleanup.rb b/db/migrate/20220422220507_remove_tmp_index_supporting_leaky_regex_cleanup.rb
new file mode 100644
index 00000000000..15a3c4d579e
--- /dev/null
+++ b/db/migrate/20220422220507_remove_tmp_index_supporting_leaky_regex_cleanup.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class RemoveTmpIndexSupportingLeakyRegexCleanup < Gitlab::Database::Migration[2.0]
+  INDEX_NAME = "tmp_index_merge_requests_draft_and_status_leaky_regex"
+  LEAKY_REGEXP_STR = "^\\[draft\\]|\\(draft\\)|draft:|draft|\\[WIP\\]|WIP:|WIP"
+  CORRECTED_REGEXP_STR = "^(\\[draft\\]|\\(draft\\)|draft:|draft|\\[WIP\\]|WIP:|WIP)"
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index_by_name :merge_requests, INDEX_NAME
+  end
+
+  def down
+    where_clause = <<~SQL
+      draft = true AND
+      state_id = 1 AND
+      ((title)::text ~* '#{LEAKY_REGEXP_STR}'::text) AND ((title)::text !~* '#{CORRECTED_REGEXP_STR}'::text)
+    SQL
+
+    add_concurrent_index :merge_requests, :id,
+      where: where_clause,
+      name: INDEX_NAME
+  end
+end