[CX] Internal error when creating a dataset without a name

CREATE DATASET `Default`.``

  ON `beer-sample`

  AT `Default`.`other`

  WHERE `type`="beer";

2020-10-10T17:42:58.794-07:00 WARN CBAS.server.QueryServiceServlet [HttpExecutor(port:9600)-8] handleException: unexpected exception java.lang.IllegalStateException: Unrecognized path structure: storage/partition_0/Default/0/.metadata: <ud>{"host":"localhost:9000","path":"/query/service","statement":"CREATE  DATASET `Default`.`` ON `beer-sample` at `Default`.`other` WHERE `type`=\\\"beer\\\"","pretty":false,"mode":"immediate","clientContextID":null,"format":"CLEAN_JSON","timeout":9223372036854775807,"maxResultReads":1,"planFormat":"JSON","expressionTree":false,"rewrittenExpressionTree":false,"logicalPlan":false,"optimizedLogicalPlan":false,"job":false,"profile":"counts","signature":true,"multiStatement":false,"parseOnly":false,"readOnly":false,"maxWarnings":0,"scanConsistency":null,"scanWait":null}</ud>

org.apache.hyracks.api.exceptions.HyracksDataException: java.lang.IllegalStateException: Unrecognized path structure: storage/partition_0/Default/0/.metadata

	at org.apache.hyracks.api.exceptions.HyracksDataException.create(HyracksDataException.java:51) ~[hyracks-api.jar:6.6.0-0000]

	at org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:251) ~[hyracks-api.jar:6.6.0-0000]

	at org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.initialize(SuperActivityOperatorNodePushable.java:91) ~[hyracks-api.jar:6.6.0-0000]

	at org.apache.hyracks.control.nc.Task.run(Task.java:320) ~[hyracks-control-nc.jar:6.6.0-0000]

	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:?]

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:?]

	at java.lang.Thread.run(Unknown Source) [?:?]

	Suppressed: org.apache.hyracks.api.exceptions.HyracksDataException: HYR0104: Index does not exist

		at org.apache.hyracks.api.exceptions.HyracksDataException.create(HyracksDataException.java:60) ~[hyracks-api.jar:6.6.0-0000]

		at org.apache.hyracks.storage.am.common.dataflow.IndexDataflowHelper.readIndex(IndexDataflowHelper.java:76) ~[hyracks-storage-am-common.jar:6.6.0-0000]

		at org.apache.hyracks.storage.am.common.dataflow.IndexDataflowHelper.destroy(IndexDataflowHelper.java:98) ~[hyracks-storage-am-common.jar:6.6.0-0000]

		at org.apache.hyracks.storage.am.common.dataflow.IndexDropOperatorNodePushable.dropIndex(IndexDropOperatorNodePushable.java:82) ~[hyracks-storage-am-common.jar:6.6.0-0000]

		at org.apache.hyracks.storage.am.common.dataflow.IndexDropOperatorNodePushable.initialize(IndexDropOperatorNodePushable.java:71) ~[hyracks-storage-am-common.jar:6.6.0-0000]

		at org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.lambda$runInParallel$0(SuperActivityOperatorNodePushable.java:228) ~[hyracks-api.jar:6.6.0-0000]

		at java.util.concurrent.FutureTask.run(Unknown Source) [?:?]

		at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:?]

		at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:?]

		at java.lang.Thread.run(Unknown Source) [?:?]

Caused by: java.lang.IllegalStateException: Unrecognized path structure: storage/partition_0/Default/0/.metadata

	at org.apache.asterix.common.storage.ResourceReference.parse(ResourceReference.java:93) ~[asterix-common.jar:6.6.0-0000]

	at org.apache.asterix.common.storage.ResourceReference.of(ResourceReference.java:48) ~[asterix-common.jar:6.6.0-0000]

	at org.apache.asterix.common.storage.ResourceReference.ofIndex(ResourceReference.java:43) ~[asterix-common.jar:6.6.0-0000]

	at org.apache.asterix.common.context.DatasetLifecycleManager.getDatasetLastValidComponentId(DatasetLifecycleManager.java:619) ~[asterix-common.jar:6.6.0-0000]

	at org.apache.asterix.common.context.DatasetLifecycleManager.populateOpTrackerAndIdGenerator(DatasetLifecycleManager.java:358) ~[asterix-common.jar:6.6.0-0000]

	at org.apache.asterix.common.context.DatasetLifecycleManager.getOperationTracker(DatasetLifecycleManager.java:335) ~[asterix-common.jar:6.6.0-0000]

	at org.apache.asterix.transaction.management.opcallbacks.PrimaryIndexOperationTrackerFactory.getOperationTracker(PrimaryIndexOperationTrackerFactory.java:52) ~[asterix-transactions.jar:6.6.0-0000]

	at org.apache.hyracks.storage.am.lsm.btree.dataflow.LSMBTreeLocalResource.createInstance(LSMBTreeLocalResource.java:108) ~[hyracks-storage-am-lsm-btree.jar:6.6.0-0000]

	at org.apache.hyracks.storage.am.lsm.btree.dataflow.LSMBTreeLocalResource.createInstance(LSMBTreeLocalResource.java:50) ~[hyracks-storage-am-lsm-btree.jar:6.6.0-0000]

	at org.apache.asterix.common.dataflow.DatasetLocalResource.createInstance(DatasetLocalResource.java:73) ~[asterix-common.jar:6.6.0-0000]

	at org.apache.hyracks.storage.am.common.build.IndexBuilder.build(IndexBuilder.java:106) ~[hyracks-storage-am-common.jar:6.6.0-0000]

	at org.apache.hyracks.storage.am.common.dataflow.IndexCreateOperatorNodePushable.initialize(IndexCreateOperatorNodePushable.java:52) ~[hyracks-storage-am-common.jar:6.6.0-0000]

	at org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.lambda$runInParallel$0(SuperActivityOperatorNodePushable.java:228) ~[hyracks-api.jar:6.6.0-0000]

	at java.util.concurrent.FutureTask.run(Unknown Source) [?:?]

	... 3 more