haohuaijin commented on code in PR #8957:
URL: https://github.com/apache/arrow-datafusion/pull/8957#discussion_r1463291485
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datafusion/physical-expr/src/expressions/case.rs:
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@@ -148,6 +148,11 @@ impl CaseExpr {
// Make sure we only consider rows that have not been matched yet
let when_match = and(&when_match, &remainder)?;
+ // When no rows available for when clause, skip then clause
+ if when_match.true_count() == 0 {
+ continue;
+ }
+
Review Comment:
> Is that case covered by existing tests? If not, can you please add a test?
yes，add this one
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