[chore](macOS) Support LLVM Clang 15 (#16991)

Remove the deprecated classes std::codecvt_utf8_utf16<char16_t> and std::wstring_convert.
Use libiconv to convert UTF-8 strings to UTF-16LE ones.

be/src/exec/table_connector.cpp

@@ -17,9 +17,10 @@
 
 #include "exec/table_connector.h"
 
+#include <fmt/core.h>
 #include <gen_cpp/Types_types.h>
-
-#include <codecvt>
+#include <glog/logging.h>
+#include <iconv.h>
 
 #include "runtime/define_primitive_type.h"
 #include "runtime/primitive_type.h"
@@ -46,8 +47,39 @@ void TableConnector::init_profile(doris::RuntimeProfile* profile) {
 }
 
 std::u16string TableConnector::utf8_to_u16string(const char* first, const char* last) {
-    std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> utf8_utf16_cvt;
-    return utf8_utf16_cvt.from_bytes(first, last);
+    auto deleter = [](auto convertor) {
+        if (convertor == reinterpret_cast<decltype(convertor)>(-1)) {
+            return;
+        }
+        iconv_close(convertor);
+    };
+    std::unique_ptr<std::remove_pointer_t<iconv_t>, decltype(deleter)> convertor(
+            iconv_open("UTF-16LE", "UTF-8"), deleter);
+
+    char* in = const_cast<char*>(first);
+    size_t inbytesleft = last - first;
+
+    char16_t buffer[1024];
+    char* out = reinterpret_cast<char*>(&buffer[0]);
+    size_t outbytesleft = sizeof(buffer);
+
+    std::u16string result;
+    while (inbytesleft > 0) {
+        if (iconv(convertor.get(), &in, &inbytesleft, &out, &outbytesleft)) {
+            if (errno == E2BIG) {
+                result += std::u16string_view(buffer,
+                                              (sizeof(buffer) - outbytesleft) / sizeof(char16_t));
+                out = reinterpret_cast<char*>(&buffer[0]);
+                outbytesleft = sizeof(buffer);
+            } else {
+                LOG(WARNING) << fmt::format("Failed to convert the UTF-8 string {} to UTF-16LE",
+                                            std::string(first, last));
+                return result;
+            }
+        }
+    }
+    result += std::u16string_view(buffer, (sizeof(buffer) - outbytesleft) / sizeof(char16_t));
+    return result;
 }
 
 Status TableConnector::append(const std::string& table_name, vectorized::Block* block,

tools/single-node-cluster/multi-fe

@@ -72,7 +72,7 @@ ${BASH_SOURCE[0]} start|stop|clean [OPTIONS ...]
 
     stop     Stop the FE cluster.
 
-    clean    Stop the data (rm -rf "\$(pwd)"/fe*).
+    clean    Clean the data (rm -rf "\$(pwd)"/fe*).
 EOF
 	exit 1
 }