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ARROW-11277: [C++] Workaround macOS 10.11: don't default construct consts #9267

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ARROW-11277: [C++] Workaround macOS 10.11: don't default construct consts #9267

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2 changes: 1 addition & 1 deletion cpp/src/arrow/dataset/expression.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -681,7 +681,7 @@ Result<Expression> FoldConstants(Expression expr) {
if (std::all_of(call->arguments.begin(), call->arguments.end(),
[](const Expression& argument) { return argument.literal(); })) {
// all arguments are literal; we can evaluate this subexpression *now*
static const Datum ignored_input;
static const Datum ignored_input = Datum{};
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Perhaps we can give Datum a default constructor?

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https://github.com/bkietz/arrow/blob/17f2df78f1fa623d05dd01f245f8f65f828f510d/cpp/src/arrow/datum.h#L118-L119

Datum has one already; resolution of that constructor is just failing here

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Uh.

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precisely

ARROW_ASSIGN_OR_RAISE(Datum constant,
ExecuteScalarExpression(expr, ignored_input));

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9 changes: 5 additions & 4 deletions cpp/src/arrow/util/future.h
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Expand Up @@ -54,7 +54,7 @@ struct is_future<Future<T>> : std::true_type {};
template <typename Signature>
using result_of_t = typename std::result_of<Signature>::type;

constexpr struct ContinueFuture {
struct ContinueFuture {
template <typename Return>
struct ForReturnImpl;

Expand Down Expand Up @@ -99,7 +99,7 @@ constexpr struct ContinueFuture {

signal_to_complete_next.AddCallback(MarkNextFinished{std::move(next)});
}
} Continue;
};

template <>
struct ContinueFuture::ForReturnImpl<void> {
Expand Down Expand Up @@ -438,13 +438,14 @@ class ARROW_MUST_USE_TYPE Future {

struct Callback {
void operator()(const Result<T>& result) && {
detail::ContinueFuture continue_future;
if (ARROW_PREDICT_TRUE(result.ok())) {
// move on_failure to a(n immediately destroyed) temporary to free its resources
ARROW_UNUSED(OnFailure(std::move(on_failure)));
detail::Continue(std::move(next), std::move(on_success), result.ValueOrDie());
continue_future(std::move(next), std::move(on_success), result.ValueOrDie());
} else {
ARROW_UNUSED(OnSuccess(std::move(on_success)));
detail::Continue(std::move(next), std::move(on_failure), result.status());
continue_future(std::move(next), std::move(on_failure), result.status());
}
}

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4 changes: 2 additions & 2 deletions cpp/src/arrow/util/thread_pool.h
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Expand Up @@ -95,8 +95,8 @@ class ARROW_EXPORT Executor {
Result<FutureType> Submit(TaskHints hints, Function&& func, Args&&... args) {
auto future = FutureType::Make();

auto task = std::bind(::arrow::detail::Continue, future, std::forward<Function>(func),
std::forward<Args>(args)...);
auto task = std::bind(::arrow::detail::ContinueFuture{}, future,
std::forward<Function>(func), std::forward<Args>(args)...);
ARROW_RETURN_NOT_OK(SpawnReal(hints, std::move(task)));

return future;
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