From 6de5d15420634d50c6f84c3a06ab32c56cc9fec2 Mon Sep 17 00:00:00 2001
From: hui lai <laihui@selectdb.com>
Date: Tue, 22 Jul 2025 21:01:03 +0800
Subject: [PATCH] [chore](load) optimize show create load error message
 (#53694)

### What problem does this PR solve?

If show create load with not exist label, the error message is `Database
does not exist`, it make users confused and not correct, and it should
be `Label does not exist`
---
 .../apache/doris/load/loadv2/LoadManager.java |  5 ++-
 .../broker_load/test_show_create_load.groovy  | 34 +++++++++++++++++++
 2 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 regression-test/suites/load_p0/broker_load/test_show_create_load.groovy

diff --git a/fe/fe-core/src/main/java/org/apache/doris/load/loadv2/LoadManager.java b/fe/fe-core/src/main/java/org/apache/doris/load/loadv2/LoadManager.java
index f661513cd66558..89f7df1fcf8e56 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/load/loadv2/LoadManager.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/load/loadv2/LoadManager.java
@@ -553,7 +553,10 @@ public List<Pair<Long, String>> getCreateLoadStmt(long dbId, String label) throw
                     throw new DdlException("Label does not exist: " + label);
                 }
             } else {
-                throw new DdlException("Database does not exist");
+                // If dbId is not found in dbIdToLabelToLoadJobs,
+                // it means the database has no label records,
+                // so throw a "Label does not exist" error.
+                throw new DdlException("Label does not exist: " + label);
             }
             return result;
         } finally {
diff --git a/regression-test/suites/load_p0/broker_load/test_show_create_load.groovy b/regression-test/suites/load_p0/broker_load/test_show_create_load.groovy
new file mode 100644
index 00000000000000..8881e35ef8e75c
--- /dev/null
+++ b/regression-test/suites/load_p0/broker_load/test_show_create_load.groovy
@@ -0,0 +1,34 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+suite("test_show_create_load", "load_p0") {
+    // test unknown db
+    try {
+        sql "show create load for unknown_db.test_label"
+    } catch (Exception e) {
+        logger.info("result: ${e.message}")
+        assertTrue(e.message.contains(" Unknown database 'unknown_db'"))
+    }
+
+    // test unknown label
+    try {
+        sql "show create load for ${context.dbName}.unknown_label"
+    } catch (Exception e) {
+        logger.info("result: ${e.message}")
+        assertTrue(e.message.contains("Label does not exist: unknown_label"))
+    }
+}
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