1 files changed, 35 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb b/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb
new file mode 100644
index 0000000000..58715978f7
--- /dev/null
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb
@@ -0,0 +1,35 @@
+module ActiveRecord
+  module ConnectionAdapters
+    class PostgreSQLTypeMetadata < DelegateClass(SqlTypeMetadata)
+      attr_reader :oid, :fmod, :array
+
+      def initialize(type_metadata, oid: nil, fmod: nil)
+        super(type_metadata)
+        @type_metadata = type_metadata
+        @oid = oid
+        @fmod = fmod
+        @array = /\[\]$/ === type_metadata.sql_type
+      end
+
+      def sql_type
+        super.gsub(/\[\]$/, "")
+      end
+
+      def ==(other)
+        other.is_a?(PostgreSQLTypeMetadata) &&
+          attributes_for_hash == other.attributes_for_hash
+      end
+      alias eql? ==
+
+      def hash
+        attributes_for_hash.hash
+      end
+
+      protected
+
+      def attributes_for_hash
+        [self.class, @type_metadata, oid, fmod]
+      end
+    end
+  end
+end