yjshen commented on code in PR #2171:
URL: https://github.com/apache/arrow-datafusion/pull/2171#discussion_r844576185
##########
datafusion/physical-expr/src/conditional_expressions.rs:
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@@ -35,36 +33,51 @@ pub fn coalesce(args: &[ColumnarValue]) ->
Result<ColumnarValue> {
)));
}
- let size = match args[0] {
- ColumnarValue::Array(ref a) => a.len(),
- ColumnarValue::Scalar(ref _s) => 1,
- };
- let mut res = new_null_array(&args[0].data_type(), size);
+ let return_type = args[0].data_type();
+ let mut return_array = args.iter().filter_map(|x| match x {
+ ColumnarValue::Array(array) => Some(array.len()),
+ _ => None,
Review Comment:
return_array is used to decide whether to return a scalar or a vector, so if
we see no array sizes and get None from `return_array.next()` we know all
params are scalar and will enter branch in line-70 and do fast scalar value
coalesce.
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