[Vectorized](udaf) fix java-udaf couldn't get jar core dump (#14393)

fix java-udaf couldn't get jar core dump

be/src/runtime/user_function_cache.cpp

@@ -22,6 +22,7 @@
 #include <vector>
 
 #include "common/config.h"
+#include "common/status.h"
 #include "env/env.h"
 #include "gutil/strings/split.h"
 #include "http/http_client.h"
@@ -432,4 +433,41 @@ Status UserFunctionCache::get_jarpath(int64_t fid, const std::string& url,
     return Status::OK();
 }
 
+Status UserFunctionCache::check_jar(int64_t fid, const std::string& url,
+                                    const std::string& checksum) {
+    UserFunctionCacheEntry* entry = nullptr;
+    Status st = Status::OK();
+    {
+        std::lock_guard<std::mutex> l(_cache_lock);
+        auto it = _entry_map.find(fid);
+        if (it != _entry_map.end()) {
+            entry = it->second;
+        } else {
+            entry = new UserFunctionCacheEntry(
+                    fid, checksum, _make_lib_file(fid, checksum, LibType::JAR), LibType::JAR);
+            entry->ref();
+            _entry_map.emplace(fid, entry);
+        }
+        entry->ref();
+    }
+    if (entry->is_loaded.load()) {
+        return st;
+    }
+
+    std::unique_lock<std::mutex> l(entry->load_lock);
+    if (!entry->is_downloaded) {
+        st = _download_lib(url, entry);
+    }
+    if (!st.ok()) {
+        // if we load a cache entry failed, I think we should delete this entry cache
+        // even if this cache was valid before.
+        _destroy_cache_entry(entry);
+        return Status::InternalError(
+                "Java UDAF has error, maybe you should check the path about java impl jar, because "
+                "{}",
+                st.get_error_msg());
+    }
+    return Status::OK();
+}
+
 } // namespace doris