Revert "Optimize CASE expression for "expr or expr" usage. (#13953)" #15388
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The commit is reverted sans the SLT test added there.
Which issue does this PR close?
Rationale for this change
This reverts commit 0f4b8b1 (#13953). The commit improved performance at the cost of a regression (#15384).
What changes are included in this PR?
Are these changes tested?
SLT
Are there any user-facing changes?
yes