fix: list(None) is logically equivalent to list("/")

[rtyler]

Sending minidfs a list operation of an empty string does not appear to be valid, added a regression test here too.

    ---- test::test_object_store stdout ----

    thread 'test::test_object_store' panicked at tests/test_object_store.rs:86:37:
    called `Result::unwrap()` on an `Err` value: Generic { store: "HdfsObjectStore", source: RPCError("java.lang.AssertionError", "Absolute path required, but got ''\n\tat org.apache.hadoop.hdfs.server.namenode.INode.checkAbsolutePath(INode.java:849)\n\tat org.apache.hadoop.hdfs.server.namenode.INode.getPathComponents(INode.java:824)\n\tat org.apache.hadoop.hdfs.server.namenode.FSDirectory.resolvePath(FSDirectory.java:726)\n\tat org.apache.hadoop.hdfs.server.namenode.FSDirStatAndListingOp.getListingInt(FSDirStatAndListingOp.java:57)\n\tat org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getListing(FSNamesystem.java:4200)\n\tat org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getListing(NameNodeRpcServer.java:1195)\n\tat org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getListing(ClientNamenodeProtocolServerSideTranslatorPB.java:762)\n\tat org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)\n\tat org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:621)\n\tat org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:589)\n\tat org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:573)\n\tat org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1227)\n\tat org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1246)\n\tat org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1169)\n\tat java.base/java.security.AccessController.doPrivileged(Native Method)\n\tat java.base/javax.security.auth.Subject.doAs(Subject.java:423)\n\tat org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1953)\n\tat org.apache.hadoop.ipc.Server$Handler.run(Server.java:3198)\n") }
    note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
    Dropping and killing minidfs

[Kimahriman]

Just let me know if/when you need a release cut

[rtyler]

@Kimahriman whenever you have time is fine, this behavior causes trouble in delta-kernel-rs. I discovered our integration tests weren't actually running in CI for HDFS 🤦

[Kimahriman]

@Kimahriman whenever you have time is fine, this behavior causes trouble in delta-kernel-rs. I discovered our integration tests weren't actually running in CI for HDFS 🤦

Hah awesome. If this was the only issue you hit I can make the release

[rtyler]

if you wouldn't mind cutting that release, then I can move forward with the enabling of the hdfs integration tests for for kernel

[Kimahriman]

if you wouldn't mind cutting that release, then I can move forward with the enabling of the hdfs integration tests for for kernel

Done