From d5958f2af7651f5e7e5b2f85cae6be22195ef802 Mon Sep 17 00:00:00 2001
From: starocean999 <12095047@qq.com>
Date: Wed, 24 Apr 2024 11:18:19 +0800
Subject: [PATCH] [fix](nereids)prevent null pointer access if translate
 expression fails

---
 .../nereids/rules/expression/rules/FoldConstantRuleOnBE.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/FoldConstantRuleOnBE.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/FoldConstantRuleOnBE.java
index e334eb8425ec6c..89955dc4950e62 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/FoldConstantRuleOnBE.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/FoldConstantRuleOnBE.java
@@ -136,6 +136,11 @@ private void collectConst(Expression expr, Map<String, Expression> constMap, Map
                 LOG.warn("expression {} translate to legacy expr failed. ", expr, e);
                 return;
             }
+            if (staleExpr == null) {
+                // just return, it's a fail-safe
+                LOG.warn("expression {} translate to legacy expr failed. ", expr);
+                return;
+            }
             tExprMap.put(id, staleExpr.treeToThrift());
         } else {
             for (int i = 0; i < expr.children().size(); i++) {