From 43a5116b9e7cecc97fc400a15d3fa38ebf00f0f1 Mon Sep 17 00:00:00 2001
From: "Mingyu Chen (Rayner)" <morningman@163.com>
Date: Fri, 20 Jun 2025 13:58:41 +0800
Subject: [PATCH] branch-2.1: [fix](jdbc)make sure init the jdbc client before
 using it (#51541)

This may cause some statistic collection task fail:
```
2025-06-05 15:02:32,277 WARN (Statistics Job Appender|182) [ExternalCatalog.buildDbForInit():902] Failed to check db DORIS_TEST exist in remote system, ignore it.
java.lang.NullPointerException: Cannot invoke "org.apache.doris.datasource.jdbc.client.JdbcClient.getDatabaseNameList()" because "this.jdbcClient" is null
        at org.apache.doris.datasource.jdbc.JdbcExternalCatalog.listDatabaseNames(JdbcExternalCatalog.java:267) ~[doris-fe.jar:1.2-SNAPSHOT]
        at org.apache.doris.datasource.ExternalCatalog.getFilteredDatabaseNames(ExternalCatalog.java:476) ~[doris-fe.jar:1.2-SNAPSHOT]
        at org.apache.doris.datasource.ExternalCatalog.lambda$makeSureInitialized$0(ExternalCatalog.java:318) ~[doris-fe.jar:1.2-SNAPSHOT]
        at com.github.benmanes.caffeine.cache.LocalLoadingCache.lambda$newMappingFunction$2(LocalLoadingCache.java:145) ~[hive-catalog-shade-2.1.4.jar:2.1.4]
        at com.github.benmanes.caffeine.cache.LocalCache.lambda$statsAware$0(LocalCache.java:139) ~[hive-catalog-shade-2.1.4.jar:2.1.4]
        at com.github.benmanes.caffeine.cache.BoundedLocalCache.lambda$doComputeIfAbsent$14(BoundedLocalCache.java:2406) ~[hive-catalog-shade-2.1.4.jar:2.1.4]
        at java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1916) ~[?:?]
```

Only for branch-2.1.
Fix master in #51471
---
 .../org/apache/doris/datasource/jdbc/JdbcExternalCatalog.java    | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/JdbcExternalCatalog.java b/fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/JdbcExternalCatalog.java
index b562a0329f..bbe43ce1fe 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/JdbcExternalCatalog.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/JdbcExternalCatalog.java
@@ -156,6 +156,7 @@ public class JdbcExternalCatalog extends ExternalCatalog {
     }
 
     public String getDatabaseTypeName() {
+        makeSureInitialized();
         return jdbcClient.getDbType();
     }