From 809f67e47803335f33fa40c04259d41fad572927 Mon Sep 17 00:00:00 2001
From: starocean999 <40539150+starocean999@users.noreply.github.com>
Date: Tue, 1 Aug 2023 21:59:47 +0800
Subject: [PATCH] [fix](nereids)fix bug of cast expr to decimalv3 without any
 check (#22466)

---
 .../rules/expression/rules/SimplifyComparisonPredicate.java    | 3 ++-
 .../suites/nereids_syntax_p0/test_simplify_comparison.groovy   | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SimplifyComparisonPredicate.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SimplifyComparisonPredicate.java
index cdc4d80a8a..c66e27e8b2 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SimplifyComparisonPredicate.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SimplifyComparisonPredicate.java
@@ -203,7 +203,8 @@ public class SimplifyComparisonPredicate extends AbstractExpressionRewriteRule {
             right = temp;
         }
 
-        if (left instanceof Cast && right instanceof DecimalV3Literal) {
+        if (left instanceof Cast && left.child(0).getDataType().isDecimalV3Type()
+                && right instanceof DecimalV3Literal) {
             Cast cast = (Cast) left;
             left = cast.child();
             DecimalV3Literal literal = (DecimalV3Literal) right;
diff --git a/regression-test/suites/nereids_syntax_p0/test_simplify_comparison.groovy b/regression-test/suites/nereids_syntax_p0/test_simplify_comparison.groovy
index c252e8b86c..53c0ff9a12 100644
--- a/regression-test/suites/nereids_syntax_p0/test_simplify_comparison.groovy
+++ b/regression-test/suites/nereids_syntax_p0/test_simplify_comparison.groovy
@@ -70,4 +70,6 @@ suite("test_simplify_comparison") {
         contains ">= 111.12"
         contains ">= '2023-06-16 00:00:00'"
     }
+
+    sql "select cast('1234' as decimalv3(18,4)) > 2000;"
 }
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