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

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Kimahriman:bug-case-subexpr-elimination

Commits on May 23, 2021

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