enhance: add udf stub expiration of 10s after creation

source/libs/function/src/tudf.c

@@ -343,7 +343,7 @@ typedef struct SUdfcFuncStub {
   char           udfName[TSDB_FUNC_NAME_LEN + 1];
   UdfcFuncHandle handle;
   int32_t        refCount;
-  int64_t        lastRefTime;
+  int64_t        createTime;
 } SUdfcFuncStub;
 
 typedef struct SUdfcProxy {
@@ -982,15 +982,15 @@ int32_t acquireUdfFuncHandle(char *udfName, UdfcFuncHandle *pHandle) {
   if (stubIndex != -1) {
     SUdfcFuncStub *foundStub = taosArrayGet(gUdfcProxy.udfStubs, stubIndex);
     UdfcFuncHandle handle = foundStub->handle;
-    if (handle != NULL && ((SUdfcUvSession *)handle)->udfUvPipe != NULL) {
+    int64_t currUs = taosGetTimestampUs();
+    if (handle != NULL && ((SUdfcUvSession *)handle)->udfUvPipe != NULL && (currUs - foundStub->createTime) < 10 * 1000 * 1000) {
       *pHandle = foundStub->handle;
       ++foundStub->refCount;
-      foundStub->lastRefTime = taosGetTimestampUs();
       uv_mutex_unlock(&gUdfcProxy.udfStubsMutex);
       return 0;
     } else {
-      fnInfo("invalid handle for %s, refCount: %d, last ref time: %" PRId64 ". remove it from cache", udfName,
-             foundStub->refCount, foundStub->lastRefTime);
+      fnInfo("invalid handle for %s, refCount: %d, create time: %" PRId64 ". remove it from cache", udfName,
+             foundStub->refCount, foundStub->createTime);
       taosArrayRemove(gUdfcProxy.udfStubs, stubIndex);
     }
   }
@@ -1001,7 +1001,7 @@ int32_t acquireUdfFuncHandle(char *udfName, UdfcFuncHandle *pHandle) {
     strncpy(stub.udfName, udfName, TSDB_FUNC_NAME_LEN);
     stub.handle = *pHandle;
     ++stub.refCount;
-    stub.lastRefTime = taosGetTimestampUs();
+    stub.createTime = taosGetTimestampUs();
     taosArrayPush(gUdfcProxy.udfStubs, &stub);
     taosArraySort(gUdfcProxy.udfStubs, compareUdfcFuncSub);
   } else {
@@ -1046,14 +1046,14 @@ int32_t cleanUpUdfs() {
       fnInfo("tear down udf. udf name: %s, handle: %p, ref count: %d", stub->udfName, stub->handle, stub->refCount);
       doTeardownUdf(stub->handle);
     } else {
-      fnInfo("udf still in use. udf name: %s, ref count: %d, last ref time: %" PRId64 ", handle: %p", stub->udfName,
-             stub->refCount, stub->lastRefTime, stub->handle);
+      fnInfo("udf still in use. udf name: %s, ref count: %d, create time: %" PRId64 ", handle: %p", stub->udfName,
+             stub->refCount, stub->createTime, stub->handle);
       UdfcFuncHandle handle = stub->handle;
       if (handle != NULL && ((SUdfcUvSession *)handle)->udfUvPipe != NULL) {
         taosArrayPush(udfStubs, stub);
       } else {
-        fnInfo("udf invalid handle for %s, refCount: %d, last ref time: %" PRId64 ". remove it from cache",
-               stub->udfName, stub->refCount, stub->lastRefTime);
+        fnInfo("udf invalid handle for %s, refCount: %d, create time: %" PRId64 ". remove it from cache",
+               stub->udfName, stub->refCount, stub->createTime);
       }
     }
     ++i;