rtpsw commented on code in PR #13880:
URL: https://github.com/apache/arrow/pull/13880#discussion_r946919428
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cpp/src/arrow/compute/exec/options.h:
##########
@@ -397,23 +397,33 @@ class ARROW_EXPORT HashJoinNodeOptions : public
ExecNodeOptions {
/// This node will output one row for each row in the left table.
class ARROW_EXPORT AsofJoinNodeOptions : public ExecNodeOptions {
public:
- AsofJoinNodeOptions(FieldRef on_key, FieldRef by_key, int64_t tolerance)
- : on_key(std::move(on_key)), by_key(std::move(by_key)),
tolerance(tolerance) {}
+ AsofJoinNodeOptions(FieldRef on_key, const FieldRef& by_key, int64_t
tolerance)
+ : on_key(std::move(on_key)), by_key(), tolerance(tolerance) {
+ this->by_key.push_back(std::move(by_key));
+ }
+
+ AsofJoinNodeOptions(FieldRef on_key, std::vector<FieldRef> by_key, int64_t
tolerance)
+ : on_key(std::move(on_key)), by_key(by_key), tolerance(tolerance) {}
+
+ // resolves ambiguity between previous constructors when initializer list is
given
+ AsofJoinNodeOptions(FieldRef on_key, std::initializer_list<FieldRef> by_key,
Review Comment:
The other two constructors, one accepting a `FieldRef` parameter and the
other a `std::vector<FieldRef>` parameter, cannot be disambiguated when one
writes something like `AsOfJoinOptions("time", {"key1", "key2"}, tolerance)`
because `{"key1", "key2"}` fits both parameter types `{"key1", "key2"}` with a
single implicit conversion. However, once a constructor with
`std::initializer_list<FieldRef>` is added, this is the constructor the
compiler will pick, since it involves no implicit conversion.
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