diff --git a/fe/fe-core/src/test/java/org/apache/doris/nereids/trees/expressions/literal/StringLikeLiteralTest.java b/fe/fe-core/src/test/java/org/apache/doris/nereids/trees/expressions/literal/StringLikeLiteralTest.java
index f7ffb4c89b424b..c1e9bc0e839b2a 100644
--- a/fe/fe-core/src/test/java/org/apache/doris/nereids/trees/expressions/literal/StringLikeLiteralTest.java
+++ b/fe/fe-core/src/test/java/org/apache/doris/nereids/trees/expressions/literal/StringLikeLiteralTest.java
@@ -19,12 +19,15 @@
 
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
+
 public class StringLikeLiteralTest {
     @Test
     public void testStrToDouble() {
+        // fix bug: maxStr.length = 4, maxStr.getBytes().length=12
+        // when converting str to double, bytes length is used instead of string length
         String minStr = "商家+店长+场地+设备类型维度";
         String maxStr = "商家维度";
-        double d1= StringLikeLiteral.getDouble(minStr);
+        double d1 = StringLikeLiteral.getDouble(minStr);
         double d2 = StringLikeLiteral.getDouble(maxStr);
         Assertions.assertTrue(d1 < d2);
     }