GH-38704: [C++] Implement Azure FileSystem Move() via Azure DataLake Storage Gen 2 API

cpp/src/arrow/filesystem/azurefs.h

@@ -210,6 +210,25 @@ class ARROW_EXPORT AzureFileSystem : public FileSystem {
 
   Status DeleteFile(const std::string& path) override;
 
+  /// \brief Move / rename a file or directory.
+  ///
+  /// There are no files immediately at the root directory, so paths like
+  /// "/segment" always refer to a container of the storage account and are
+  /// treated as directories.
+  ///
+  /// If `dest` exists but the operation fails for some reason, `Move`
+  /// guarantees `dest` is not lost.
+  ///
+  /// Conditions for a successful move:
+  /// 1. `src` must exist.
+  /// 2. `dest` can't contain a strict path prefix of `src`. More generally,
+  ///    a directory can't be made a subdirectory of itself.
+  /// 3. If `dest` already exists and its a file, `src` must also be a file.
+  ///    `dest` is then replaced by `src`.
+  /// 4. All components of `dest` must exist, except for the last.
+  /// 5. If `dest` already exists and its a directory, `src` must also be a
+  ///    directory and `dest` must be empty. `dest` is then replaced by `src`
+  ///    and its contents.
   Status Move(const std::string& src, const std::string& dest) override;
 
   Status CopyFile(const std::string& src, const std::string& dest) override;

cpp/src/arrow/filesystem/util_internal.cc

@@ -63,11 +63,21 @@ Status PathNotFound(std::string_view path) {
       .WithDetail(StatusDetailFromErrno(ENOENT));
 }
 
+Status IsADir(std::string_view path) {
+  return Status::IOError("Is a directory: '", path, "'")
+      .WithDetail(StatusDetailFromErrno(EISDIR));
+}
+
 Status NotADir(std::string_view path) {
   return Status::IOError("Not a directory: '", path, "'")
       .WithDetail(StatusDetailFromErrno(ENOTDIR));
 }
 
+Status NotEmpty(std::string_view path) {
+  return Status::IOError("Directory not empty: '", path, "'")
+      .WithDetail(StatusDetailFromErrno(ENOTEMPTY));
+}
+
 Status NotAFile(std::string_view path) {
   return Status::IOError("Not a regular file: '", path, "'");
 }

cpp/src/arrow/filesystem/util_internal.h

@@ -43,9 +43,15 @@ Status CopyStream(const std::shared_ptr<io::InputStream>& src,
 ARROW_EXPORT
 Status PathNotFound(std::string_view path);
 
+ARROW_EXPORT
+Status IsADir(std::string_view path);
+
 ARROW_EXPORT
 Status NotADir(std::string_view path);
 
+ARROW_EXPORT
+Status NotEmpty(std::string_view path);
+
 ARROW_EXPORT
 Status NotAFile(std::string_view path);
 

cpp/src/arrow/util/io_util.cc

@@ -449,6 +449,13 @@ std::shared_ptr<StatusDetail> StatusDetailFromErrno(int errnum) {
   return std::make_shared<ErrnoDetail>(errnum);
 }
 
+std::optional<int> ErrnoFromStatusDetail(const StatusDetail& detail) {
+  if (detail.type_id() == kErrnoDetailTypeId) {
+    return checked_cast<const ErrnoDetail&>(detail).errnum();
+  }
+  return std::nullopt;
+}
+
 #if _WIN32
 std::shared_ptr<StatusDetail> StatusDetailFromWinError(int errnum) {
   if (!errnum) {

cpp/src/arrow/util/io_util.h

@@ -264,6 +264,8 @@ std::string WinErrorMessage(int errnum);
 
 ARROW_EXPORT
 std::shared_ptr<StatusDetail> StatusDetailFromErrno(int errnum);
+ARROW_EXPORT
+std::optional<int> ErrnoFromStatusDetail(const StatusDetail& detail);
 #if _WIN32
 ARROW_EXPORT
 std::shared_ptr<StatusDetail> StatusDetailFromWinError(int errnum);