[fix](null safe equal join) fix coredump if both sides of the conjunct is not nullable #36263

[jacktengg]

Proposed changes

Bp #36263

[doris-robot]

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[jacktengg]

run buildall

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[doris-robot]

TeamCity be ut coverage result: Function Coverage: 36.34% (9152/25185) Line Coverage: 27.88% (74684/267893) Region Coverage: 26.78% (38514/143792) Branch Coverage: 23.47% (19517/83146) Coverage Report: http://coverage.selectdb-in.cc/coverage/b5f010d7bd40b514965f21eb2d381d0984581ec1_b5f010d7bd40b514965f21eb2d381d0984581ec1/report/index.html

[github-actions[bot]]

PR approved by at least one committer and no changes requested.

[github-actions[bot]]

PR approved by anyone and no changes requested.