1 files changed, 32 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/explain_registry.rb b/activerecord/lib/active_record/explain_registry.rb
new file mode 100644
index 0000000000..7fd078941a
--- /dev/null
+++ b/activerecord/lib/active_record/explain_registry.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require "active_support/per_thread_registry"
+
+module ActiveRecord
+  # This is a thread locals registry for EXPLAIN. For example
+  #
+  #   ActiveRecord::ExplainRegistry.queries
+  #
+  # returns the collected queries local to the current thread.
+  #
+  # See the documentation of ActiveSupport::PerThreadRegistry
+  # for further details.
+  class ExplainRegistry # :nodoc:
+    extend ActiveSupport::PerThreadRegistry
+
+    attr_accessor :queries, :collect
+
+    def initialize
+      reset
+    end
+
+    def collect?
+      @collect
+    end
+
+    def reset
+      @collect = false
+      @queries = []
+    end
+  end
+end