[SPARK-35449][SQL] Only extract common expressions from CaseWhen values if elseValue is set#32595

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Kimahriman wants to merge 2 commits intoapache:masterfrom

Kimahriman:bug-case-subexpr-elimination

Commits on May 23, 2021

CaseWhen needs to have an elseValue to be considered for subexpression elimination
Kimahriman
committed
Add comment, create new test, and fix test after rebasing
Kimahriman
committed