diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/NereidsPlanner.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/NereidsPlanner.java
index 6a24aa6f5a71ae..117f7a5560244d 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/NereidsPlanner.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/NereidsPlanner.java
@@ -581,8 +581,7 @@ public Optional<ResultSet> handleQueryInFe(StatementBase parsedStmt) {
             return Optional.of(resultSet);
         } else if (child instanceof PhysicalEmptyRelation) {
             List<Column> columns = Lists.newArrayList();
-            PhysicalEmptyRelation physicalEmptyRelation = (PhysicalEmptyRelation) physicalPlan.child(0);
-            for (int i = 0; i < physicalEmptyRelation.getProjects().size(); i++) {
+            for (int i = 0; i < physicalPlan.getOutput().size(); i++) {
                 NamedExpression output = physicalPlan.getOutput().get(i);
                 columns.add(new Column(output.getName(), output.getDataType().toCatalogDataType()));
             }
diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/ComputePrecisionForRound.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/ComputePrecisionForRound.java
index eedbfea6df9ac6..cd9629640de2c2 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/ComputePrecisionForRound.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/ComputePrecisionForRound.java
@@ -37,7 +37,8 @@ default FunctionSignature computePrecision(FunctionSignature signature) {
             Expression floatLength = getArgument(1);
             int scale;
 
-            if (floatLength.isLiteral() || (floatLength instanceof Cast && floatLength.child(0).isLiteral()
+            if ((floatLength.isLiteral() && floatLength.getDataType() instanceof Int32OrLessType)
+                    || (floatLength instanceof Cast && floatLength.child(0).isLiteral()
                     && floatLength.child(0).getDataType() instanceof Int32OrLessType)) {
                 // Scale argument is a literal or cast from other literal
                 if (floatLength instanceof Cast) {
diff --git a/regression-test/suites/correctness_p0/test_cast_decimal.groovy b/regression-test/suites/correctness_p0/test_cast_decimal.groovy
index 21a1ab6d0c3ee4..e7d5caa8f196c4 100644
--- a/regression-test/suites/correctness_p0/test_cast_decimal.groovy
+++ b/regression-test/suites/correctness_p0/test_cast_decimal.groovy
@@ -24,16 +24,6 @@ suite("test_cast_decimal") {
         sql """select cast(32123.34212456734 as decimal(3,2));"""
         contains "cast(32123.34212456734 as DECIMALV3(3, 2))"
     }
-    
-
-    sql """
-        set enable_nereids_planner=false;
-    """
-
-    explain {
-        sql """select cast(32123.34212456734 as decimal(3,2));"""
-        contains "CAST(32123.34212456734 AS DECIMALV3(3, 2))"
-    }
 
     sql """drop table if exists test_ttt"""
     sql """create table test_ttt(big_key bigint)DISTRIBUTED BY HASH(big_key) BUCKETS 1 PROPERTIES ("replication_num" = "1");"""