alamb commented on code in PR #2197:
URL: https://github.com/apache/arrow-datafusion/pull/2197#discussion_r849312085
##########
datafusion/physical-expr/src/expressions/case.rs:
##########
@@ -178,6 +178,13 @@ impl CaseExpr {
let when_value = self.when_then_expr[i]
.0
.evaluate_selection(batch, &remainder)?;
+ // Treat 'NULL' as false value
+ let when_value = match when_value {
+ ColumnarValue::Scalar(value) if value.is_null() => {
Review Comment:
This is a reasonable solution I think -- ideally we would have been able to
coerce this value into a `ColumnarValue::Scalar(ScalarValue::Boolean(None))` at
some earlier point.
However, I think this special case is reasonable (and the test coverage is
nice) so 👍 from me
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