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From "Marcelo Vanzin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-21617) ALTER TABLE...ADD COLUMNS broken in Hive 2.1 for DS tables
Date Tue, 15 Aug 2017 00:13:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-21617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126657#comment-16126657
] 

Marcelo Vanzin commented on SPARK-21617:
----------------------------------------

https://github.com/apache/spark/pull/18849

> ALTER TABLE...ADD COLUMNS broken in Hive 2.1 for DS tables
> ----------------------------------------------------------
>
>                 Key: SPARK-21617
>                 URL: https://issues.apache.org/jira/browse/SPARK-21617
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Marcelo Vanzin
>
> When you have a data source table and you run a "ALTER TABLE...ADD COLUMNS" query, Spark
will save invalid metadata to the Hive metastore.
> Namely, it will overwrite the table's schema with the data frame's schema; that is not
desired for data source tables (where the schema is stored in a table property instead).
> Moreover, if you use a newer metastore client where METASTORE_DISALLOW_INCOMPATIBLE_COL_TYPE_CHANGES
is on by default, you actually get an exception:
> {noformat}
> InvalidOperationException(message:The following columns have types incompatible with
the existing columns in their respective positions :
> c1)
> 	at org.apache.hadoop.hive.metastore.MetaStoreUtils.throwExceptionIfIncompatibleColTypeChange(MetaStoreUtils.java:615)
> 	at org.apache.hadoop.hive.metastore.HiveAlterHandler.alterTable(HiveAlterHandler.java:133)
> 	at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.alter_table_core(HiveMetaStore.java:3704)
> 	at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.alter_table_with_environment_context(HiveMetaStore.java:3675)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	at org.apache.hadoop.hive.metastore.RetryingHMSHandler.invokeInternal(RetryingHMSHandler.java:140)
> 	at org.apache.hadoop.hive.metastore.RetryingHMSHandler.invoke(RetryingHMSHandler.java:99)
> 	at com.sun.proxy.$Proxy26.alter_table_with_environment_context(Unknown Source)
> 	at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.alter_table_with_environmentContext(HiveMetaStoreClient.java:402)
> 	at org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient.alter_table_with_environmentContext(SessionHiveMetaStoreClient.java:309)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:498)
> 	at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.invoke(RetryingMetaStoreClient.java:154)
> 	at com.sun.proxy.$Proxy27.alter_table_with_environmentContext(Unknown Source)
> 	at org.apache.hadoop.hive.ql.metadata.Hive.alterTable(Hive.java:601)
> {noformat}
> That exception is handled by Spark in an odd way (see code in {{HiveExternalCatalog.scala}})
which still stores invalid metadata.



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