korowa commented on code in PR #4737:
URL: https://github.com/apache/arrow-datafusion/pull/4737#discussion_r1057313831
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datafusion/physical-expr/src/expressions/nullif.rs:
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@@ -88,17 +50,34 @@ pub fn nullif_func(args: &[ColumnarValue]) ->
Result<ColumnarValue> {
let cond_array = eq_dyn(lhs, rhs)?;
// Now, invoke nullif on the result
- let array = primitive_bool_array_op!(lhs, &cond_array, nullif)?;
+ let array = nullif(lhs, as_boolean_array(&cond_array)?)?;
+ Ok(ColumnarValue::Array(array))
+ }
+ (ColumnarValue::Scalar(lhs), ColumnarValue::Array(rhs)) => {
+ // Similar to Array-Array case, except of ScalarValue -> Array cast
+ let lhs = lhs.to_array_of_size(rhs.len());
+ let cond_array = eq_dyn(&lhs, rhs)?;
+
+ let array = nullif(&lhs, as_boolean_array(&cond_array)?)?;
Ok(ColumnarValue::Array(array))
}
- _ => Err(DataFusionError::NotImplemented(
- "nullif does not support a literal as first argument".to_string(),
- )),
+ (ColumnarValue::Scalar(lhs), ColumnarValue::Scalar(rhs)) => {
+ let val = match lhs.eq(rhs) {
+ true => ScalarValue::Null,
Review Comment:
Nice catch, thank you!
Fixed scalar-scalar case to return empty value with data type inherited from
first argument, also added .slt for nullif
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