  Recent studies have revealed that solar jets involving minifilament eruptions
may be initiated under the well-known magnetic-breakout mechanism. Before or
just at the onset of those jets, there should be a current sheet, where
breakout magnetic reconnection takes place, between open fields and the outside
of the jet-base arcade carrying minifilament in its core. In this paper we
present a jet produced by eruption of two minifilaments lying at the jet base.
A current sheet is directly detected near the jet base before the onset of the
eruption, suggesting the magnetic-breakout mechanism. However, we further find
that the current sheet undergoes a transition. The current sheet first shortens
to zero in length, but then lengthens towards an orthogonal direction relative
to its initial orientation. The change of the current sheet gives rise to a
reversal of the breakout reconnection, as the inflow and outflow regions before
the transition become the outflow and inflow regions after the transition,
respectively. We therefore propose that this observation provides evidence for
the so-called oscillatory reconnection which is defined by a series of
reconnection reversals but not yet proved to exist in real plasma environment
of the solar atmosphere.
