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https://issues.apache.org/jira/browse/HIVE-27193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17706501#comment-17706501
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Oliver Schiller commented on HIVE-27193:
----------------------------------------
The code in getTempTable was added in
[https://github.com/apache/hive/pull/3072]. It seems that it was added to deal
with changes mades in getPartitionsByNames.
> Database names starting with '@' cause error during ALTER/DROP table.
> ---------------------------------------------------------------------
>
> Key: HIVE-27193
> URL: https://issues.apache.org/jira/browse/HIVE-27193
> Project: Hive
> Issue Type: Bug
> Components: Metastore, Standalone Metastore
> Affects Versions: 4.0.0-alpha-2
> Reporter: Oliver Schiller
> Priority: Major
>
> The creation of database that start with '@' is supported:
>
> {code:java}
> create database `@test`;{code}
>
> The creation of a table in this database works:
>
> {code:java}
> create table `@test`.testtable (c1 integer);{code}
> However, dropping or altering the table result in an error:
>
> {code:java}
> drop table `@test`.testtable;
> FAILED: SemanticException Unable to fetch table testtable. @test is prepended
> with the catalog marker but does not appear to have a catalog name in it
> Error: Error while compiling statement: FAILED: SemanticException Unable to
> fetch table testtable. @test is prepended with the catalog marker but does
> not appear to have a catalog name in it (state=42000,code=40000)
> alter table `@test`.testtable add columns (c2 integer);
> FAILED: SemanticException Unable to fetch table testtable. @test is prepended
> with the catalog marker but does not appear to have a catalog name in it
> Error: Error while compiling statement: FAILED: SemanticException Unable to
> fetch table testtable. @test is prepended with the catalog marker but does
> not appear to have a catalog name in it (state=42000,code=40000)
> {code}
>
> Relevant snippet of stack trace:
>
> {{}}
> {code:java}
> org.apache.hadoop.hive.metastore.api.MetaException: @TEST is prepended with
> the catalog marker but does not appear to have a catalog name in it at
> org.apache.hadoop.hive.metastore.utils.MetaStoreUtils.parseDbName(MetaStoreUtils.java:1031
> at
> org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient.getTempTable(SessionHiveMetaStoreClient.java:651)
> at
> org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient.getTable(SessionHiveMetaStoreClient.java:279)
> at
> org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient.getTable(SessionHiveMetaStoreClient.java:273)
> at
> org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient.getTable(SessionHiveMetaStoreClient.java:258)
> at
> org.apache.hadoop.hive.metastore.HiveMetaStoreClient.dropTable(HiveMetaStoreClient.java:1982)org.apache.hadoop.hive.metastore.HiveMetaStoreClient.dropTable(HiveMetaStoreClient.java:1957)
> ...{code}
> {{}}
>
> My suspicion is that this caused by the implementation of getTempTable and
> how it is called. The method getTempTable calls parseDbName assuming that the
> given dbname might be prefixed with a catalog name. I'm wondering whether
> this is correct at this layer. From poking a bit around, it appears to me
> that the catalog name is typically prepended when making the actual thrift
> call.
>
>
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