yjshen commented on code in PR #2197:
URL: https://github.com/apache/arrow-datafusion/pull/2197#discussion_r846930183
##########
datafusion/physical-expr/src/expressions/case.rs:
##########
@@ -178,6 +178,17 @@ 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() {
+
ColumnarValue::Scalar(ScalarValue::Boolean(Some(false)))
+ } else {
+ ColumnarValue::Scalar(value)
+ }
+ }
+ _ => when_value,
+ };
Review Comment:
```suggestion
let when_value = match when_value {
ColumnarValue::Scalar(value) if value.is_null() => {
continue;
}
_ => when_value,
};
```
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