From f4d3f4ae19e6c8ef99716769e4c50083d916e619 Mon Sep 17 00:00:00 2001
From: mch_ucchi <41606806+sohardforaname@users.noreply.github.com>
Date: Tue, 20 Jun 2023 15:11:25 +0800
Subject: [PATCH] [Fix](Nereids) failed to fold date_format() to constant
 (#20976)

---
 .../rules/expression/rules/SupportJavaDateFormatter.java  | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SupportJavaDateFormatter.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SupportJavaDateFormatter.java
index f861944078..bf3a698887 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SupportJavaDateFormatter.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SupportJavaDateFormatter.java
@@ -23,7 +23,7 @@ import org.apache.doris.nereids.trees.expressions.Expression;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.DateFormat;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.FromUnixtime;
 import org.apache.doris.nereids.trees.expressions.literal.Literal;
-import org.apache.doris.nereids.trees.expressions.literal.StringLiteral;
+import org.apache.doris.nereids.trees.expressions.literal.VarcharLiteral;
 
 import com.google.common.collect.Lists;
 
@@ -75,11 +75,11 @@ public class SupportJavaDateFormatter extends AbstractExpressionRewriteRule {
             Literal literal = (Literal) formatterExpr;
             String originFormatter = literal.getStringValue();
             if (originFormatter.equals("yyyyMMdd")) {
-                return new StringLiteral("%Y%m%d");
+                return new VarcharLiteral("%Y%m%d");
             } else if (originFormatter.equals("yyyy-MM-dd")) {
-                return new StringLiteral("%Y-%m-%d");
+                return new VarcharLiteral("%Y-%m-%d");
             } else if (originFormatter.equals("yyyy-MM-dd HH:mm:ss")) {
-                return new StringLiteral("%Y-%m-%d %H:%i:%s");
+                return new VarcharLiteral("%Y-%m-%d %H:%i:%s");
             }
         }
         return formatterExpr;