[VOTE] KIP-1078: Remove Leaking Getter Methods in Joined Helper Class

[TengYao Chi]

Hi everyone,

Based on our discussion
<https://lists.apache.org/thread/q8b8gzjn8s587n25rfwb73sv390zhjf5> regarding
KIP-1078 <https://cwiki.apache.org/confluence/x/hg-OEg>, I believe this KIP
is now ready for a vote.

Sincerely,
TengYao