CalvinKirs opened a new pull request, #66694:
URL: https://github.com/apache/doris/pull/66694
### What problem does this PR solve?
Issue Number: None
Related PR: #58968
Problem Summary: In Cloud SaaS mode, a JDBC catalog or Java UDF using a bare
jar name downloads the file from the instance object store.
`StorageProperties.createAll()` now prepends a default HDFS entry, while
`CloudPluginDownloader` selected the first entry and cast it to
`AbstractS3CompatibleProperties`. The cast therefore failed with
`ClassCastException` before the download. This change selects the first
explicitly S3-compatible property by type and fails clearly if none exists.
Tests cover default-HDFS ordering, all current S3-compatible property
implementations, and the missing-compatible-storage path.
### Release note
Fix automatic JDBC driver and Java UDF jar downloads from Cloud SaaS object
storage when the plugin is referenced by a bare file name.
### Check List (For Author)
- Test: Unit Test (environment blocked)
- `MAVEN_OPTS="-Xmx4g -XX:MaxMetaspaceSize=1g" FE_UT_PARALLEL=1
./run-fe-ut.sh --run org.apache.doris.common.plugin.CloudPluginDownloaderTest`
completed Checkstyle, FE main compilation, and test compilation. All 9 tests
were blocked in the existing Mockito setup because Byte Buddy cannot
self-attach in the execution sandbox; there were no assertion failures.
- Behavior changed: Yes (Cloud SaaS plugin downloads select S3-compatible
storage instead of the prepended default HDFS entry)
- Does this need documentation: No
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