[fix](udf) fix java-udf coredump as get env return nullptr (#30986)

fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/FoldConstantRuleOnBE.java

@@ -181,6 +181,8 @@ public class FoldConstantRuleOnBE extends AbstractExpressionRewriteRule {
             tParams.setQueryOptions(tQueryOptions);
             tParams.setQueryId(context.queryId());
 
+            // TODO: will be delete the debug log after find problem of timeout.
+            LOG.info("fold query {} ", DebugUtil.printId(context.queryId()));
             Future<PConstantExprResult> future =
                     BackendServiceProxy.getInstance().foldConstantExpr(brpcAddress, tParams);
             PConstantExprResult result = future.get(5, TimeUnit.SECONDS);