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https://issues.apache.org/jira/browse/TAJO-1675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14711467#comment-14711467
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ASF GitHub Bot commented on TAJO-1675:
--------------------------------------
Github user blrunner commented on a diff in the pull request:
https://github.com/apache/tajo/pull/653#discussion_r37881184
--- Diff:
tajo-catalog/tajo-catalog-common/src/main/proto/CatalogProtos.proto ---
@@ -247,13 +240,15 @@ message PartitionDescProto {
required string partitionName = 1;
repeated PartitionKeyProto partitionKeys = 2;
optional string path = 3;
--- End diff --
When adding or dropping partition, CatalogClient calls alter table API with
AlterTableDescProto. and the proto maintains partition informations to
PartitionDescProto. When adding partition, the partition path will be not null.
But when dropping partition, the path will be null because Tajo can delete
partition informs in CatalogStore with partition name.
> NPE when selecting data from information_schema.partition_keys
> --------------------------------------------------------------
>
> Key: TAJO-1675
> URL: https://issues.apache.org/jira/browse/TAJO-1675
> Project: Tajo
> Issue Type: Bug
> Components: Catalog
> Reporter: Jihoon Son
> Assignee: Jaehwa Jung
> Fix For: 0.11.0
>
>
> See the title.
> You can reproduce as follows.
> {noformat}
> default> create table partitioned_nation (n_name text, n_comment text)
> partition by column (n_nationkey int8, n_regionkey int8) ;
> OK
> default> insert into partitioned_nation select * from nation;
> default> \d partitioned_nation
> table name: default.partitioned_nation
> table uri: hdfs://localhost:7020/tajo/warehouse/default/partitioned_nation
> store type: CSV
> number of rows: 0
> volume: 0 B
> Options:
> 'text.delimiter'='|'
> schema:
> n_name TEXT
> n_comment TEXT
> Partitions:
> type:COLUMN
> columns::n_nationkey (INT8), n_regionkey (INT8)
> default> \c information_schema
> You are now connected to database "information_schema" as user "jihoonson".
> information_schema> select * from partition_keys;
> partition_id, column_name, partition_value
> -------------------------------
> ERROR: java.lang.NullPointerException
> java.sql.SQLException: java.lang.NullPointerException
> at
> org.apache.tajo.jdbc.TajoResultSetBase.next(TajoResultSetBase.java:717)
> at
> org.apache.tajo.cli.tsql.DefaultTajoCliOutputFormatter.printResult(DefaultTajoCliOutputFormatter.java:105)
> at
> org.apache.tajo.cli.tsql.TajoCli.localQueryCompleted(TajoCli.java:558)
> at org.apache.tajo.cli.tsql.TajoCli.executeQuery(TajoCli.java:532)
> at
> org.apache.tajo.cli.tsql.TajoCli.executeParsedResults(TajoCli.java:447)
> at org.apache.tajo.cli.tsql.TajoCli.runShell(TajoCli.java:419)
> at org.apache.tajo.cli.tsql.TajoCli.main(TajoCli.java:692)
> Caused by: java.io.IOException: java.lang.NullPointerException
> at org.apache.tajo.jdbc.FetchResultSet.nextTuple(FetchResultSet.java:80)
> at
> org.apache.tajo.jdbc.TajoResultSetBase.next(TajoResultSetBase.java:711)
> ... 6 more
> Caused by: com.google.protobuf.ServiceException:
> java.lang.NullPointerException
> at
> org.apache.tajo.client.QueryClientImpl.fetchNextQueryResult(QueryClientImpl.java:360)
> at
> org.apache.tajo.client.TajoClientImpl.fetchNextQueryResult(TajoClientImpl.java:134)
> at org.apache.tajo.jdbc.FetchResultSet.nextTuple(FetchResultSet.java:62)
> ... 7 more
> {noformat}
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