!1202 修复一处函数执行的内存泄漏问题

Merge pull request !1202 from movead/master_random_out_of_memory

src/gausskernel/runtime/executor/execQual.cpp

@@ -2213,6 +2213,9 @@ static Datum ExecMakeFunctionResultNoSets(
             pfree_ext(var_dno);
     }
 
+    if(node != NULL)
+        pfree_ext(node);
+
     u_sess->SPI_cxt.is_stp = savedIsSTP;
     u_sess->SPI_cxt.is_proconfig_set = savedProConfigIsSet;
     if (needResetErrMsg) {