1 files changed, 0 insertions, 52 deletions
diff --git a/activerecord/lib/active_record/collection_cache_key.rb b/activerecord/lib/active_record/collection_cache_key.rb
deleted file mode 100644
index bfcb3e54be..0000000000
--- a/activerecord/lib/active_record/collection_cache_key.rb
+++ /dev/null
@@ -1,52 +0,0 @@
-# frozen_string_literal: true
-
-module ActiveRecord
-  module CollectionCacheKey
-    def collection_cache_key(collection = all, timestamp_column = :updated_at) # :nodoc:
-      query_signature = ActiveSupport::Digest.hexdigest(collection.to_sql)
-      key = "#{collection.model_name.cache_key}/query-#{query_signature}"
-
-      if collection.loaded? || collection.distinct_value
-        size = collection.records.size
-        if size > 0
-          timestamp = collection.max_by(&timestamp_column)._read_attribute(timestamp_column)
-        end
-      else
-        if collection.eager_loading?
-          collection = collection.send(:apply_join_dependency)
-        end
-        column_type = type_for_attribute(timestamp_column)
-        column = connection.visitor.compile(collection.arel_attribute(timestamp_column))
-        select_values = "COUNT(*) AS #{connection.quote_column_name("size")}, MAX(%s) AS timestamp"
-
-        if collection.has_limit_or_offset?
-          query = collection.select("#{column} AS collection_cache_key_timestamp")
-          subquery_alias = "subquery_for_cache_key"
-          subquery_column = "#{subquery_alias}.collection_cache_key_timestamp"
-          arel = query.send(:build_subquery, subquery_alias, select_values % subquery_column)
-        else
-          query = collection.unscope(:order)
-          query.select_values = [select_values % column]
-          arel = query.arel
-        end
-
-        result = connection.select_one(arel, nil)
-
-        if result.blank?
-          size = 0
-          timestamp = nil
-        else
-          size = result["size"]
-          timestamp = column_type.deserialize(result["timestamp"])
-        end
-
-      end
-
-      if timestamp
-        "#{key}-#{size}-#{timestamp.utc.to_s(cache_timestamp_format)}"
-      else
-        "#{key}-#{size}"
-      end
-    end
-  end
-end