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https://issues.apache.org/jira/browse/HIVE-18494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HIVE-18494 started by Jesus Camacho Rodriguez.
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> Regression: from HIVE-18069, the metastore directsql is getting disabled
> ------------------------------------------------------------------------
>
> Key: HIVE-18494
> URL: https://issues.apache.org/jira/browse/HIVE-18494
> Project: Hive
> Issue Type: Bug
> Components: Standalone Metastore
> Reporter: Gopal V
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Attachments: HIVE-18494.patch
>
>
> {code:java}
> 018-01-19T02:12:34,457 WARN [pool-10-thread-1] metastore.ObjectStore:
> Falling back to ORM path due to direct SQL failure (this is not an error):
> java.lang.String cannot be cast to [Ljava.lang.Object; at
> org.apache.hadoop.hive.metastore.MetaStoreDirectSql.getTables(MetaStoreDirectSql.java:412)
> at
> org.apache.hadoop.hive.metastore.ObjectStore$2.getSqlResult(ObjectStore.java:1336)
> 2018-01-19T02:12:34,457 DEBUG [pool-10-thread-1] metastore.ObjectStore: Full
> DirectSQL callstack for debugging (note: this is not an error)
> java.lang.ClassCastException: java.lang.String cannot be cast to
> [Ljava.lang.Object;
> at
> org.apache.hadoop.hive.metastore.MetaStoreDirectSql.getTables(MetaStoreDirectSql.java:412)
> ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.metastore.ObjectStore$2.getSqlResult(ObjectStore.java:1336)
> ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.metastore.ObjectStore$2.getSqlResult(ObjectStore.java:1332)
> ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.metastore.ObjectStore$GetHelper.run(ObjectStore.java:3200)
> ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getTablesInternal(ObjectStore.java:1344)
> ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.metastore.ObjectStore.getTables(ObjectStore.java:1323)
> ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
> {code}
> The DataNucleus layer returns List<String> for this case, when exactly one
> column has been selected.
> And MetastoreDirectSQL is disabled for all further queries.
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