I noticed this problem while reviewing Tom’s patch [1]. The function eqjoinsel() unnecessarily zero-out sslot1 and sslot2 before calling get_attstatsslot() because get_attstatsslot() will unconditionally zero-out sslot in the first place.
I searched over the source tree, none of other callers of get_attstatsslot() initialize sslot. So for consistency, we should remove the unnecessary zero-out from eqjoinsel().
