From 01e6798049a0251cdf3e5205693d797177c06a79 Mon Sep 17 00:00:00 2001
From: seawinde <149132972+seawinde@users.noreply.github.com>
Date: Thu, 29 Feb 2024 16:39:30 +0800
Subject: [PATCH] [fix](Neredis) Fix npe when plan node doesn't have
 expressions in materialized view (#31579)

---
 .../nereids/jobs/joinorder/hypergraph/node/StructInfoNode.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/joinorder/hypergraph/node/StructInfoNode.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/joinorder/hypergraph/node/StructInfoNode.java
index 93e13e59da..28f1ed405e 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/joinorder/hypergraph/node/StructInfoNode.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/joinorder/hypergraph/node/StructInfoNode.java
@@ -114,7 +114,7 @@ public class StructInfoNode extends AbstractNode {
      * get all expressions of nodes
      */
     public @Nullable List<Expression> getExpressions() {
-        return expressions.stream()
+        return expressions == null ? null : expressions.stream()
                 .flatMap(Collection::stream)
                 .collect(Collectors.toList());
     }