diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/PullUpJoinFromUnion.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/PullUpJoinFromUnion.java
index 1f68d53f079c08..2f5e7fef1bdb04 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/PullUpJoinFromUnion.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/PullUpJoinFromUnion.java
@@ -90,7 +90,7 @@ public Rule build() {
                             break;
                         }
                     }
-                    if (commonChild == null || commonChild.isEmpty()) {
+                    if (commonChild == null) {
                         return null;
                     }