extensions

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 511
      def extensions
        query = <<~SQL
          SELECT
            pg_extension.extname,
            n.nspname AS schema
          FROM pg_extension
          JOIN pg_namespace n ON pg_extension.extnamespace = n.oid
        SQL

        internal_exec_query(query, "SCHEMA", allow_retry: true, materialize_transactions: false).cast_values.map do |row|
          name, schema = row[0], row[1]
          schema = nil if schema == current_schema
          [schema, name].compact.join(".")
        end
      end