fix union all issue

src/client/src/tscSQLParser.c

@@ -8568,6 +8568,7 @@ int32_t loadAllTableMeta(SSqlObj* pSql, struct SSqlInfo* pInfo) {
       if (functionId < 0) {
         struct SUdfInfo info = {0};
         info.name = strndup(t->z, t->n);
+        info.keep = true;
         if (pQueryInfo->pUdfInfo == NULL) {
           pQueryInfo->pUdfInfo = taosArrayInit(4, sizeof(struct SUdfInfo));
         } else if (taosArrayGetSize(pQueryInfo->pUdfInfo) > 0) {

src/query/inc/qUdf.h

@@ -51,6 +51,7 @@ typedef struct SUdfInfo {
   SUdfInit init;
   char *content;
   char *path;
+  bool  keep;
 } SUdfInfo;
 
 //script 

src/query/src/qExecutor.c

@@ -8075,10 +8075,21 @@ int32_t initUdfInfo(SUdfInfo* pUdfInfo) {
     // TODO check for failure of flush to disk
     /*size_t t = */ fwrite(pUdfInfo->content, pUdfInfo->contLen, 1, file);
     fclose(file);
-    tfree(pUdfInfo->content);
+    if (!pUdfInfo->keep) {
+      tfree(pUdfInfo->content);
+    }
 
+    if (pUdfInfo->path) {
+      unlink(pUdfInfo->path);
+    }
+    
+    tfree(pUdfInfo->path);
     pUdfInfo->path = strdup(path);
 
+    if (pUdfInfo->handle) {
+      taosCloseDll(pUdfInfo->handle);
+    }
+    
     pUdfInfo->handle = taosLoadDll(path);
 
     if (NULL == pUdfInfo->handle) {