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https://issues.apache.org/jira/browse/HIVE-6835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973722#comment-13973722
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Xuefu Zhang commented on HIVE-6835:
-----------------------------------
[~erwaman] Thanks for the explanation. Now I see where the problem is.
SERDEPROPERTIES and TBLPROPERTIES are for different purpose. I'm curious why
user would put avro.schema.literal in the serde properties, as this is table
specific and it should be put in TBLPROPERTIES. SERDEPROPERTIES, on the other
hand, is used to control serde behavior (plugin level instead of table level),
such as field delimiter which doesn't necessary vary from table to table. If
you check AvroSerde documentation, schema is specified in TBLPROPERTIES.
https://cwiki.apache.org/confluence/display/Hive/AvroSerDe. Thus, it seems that
this fix is for an invalid use case. What's your thought on this?
> Reading of partitioned Avro data fails if partition schema does not match
> table schema
> --------------------------------------------------------------------------------------
>
> Key: HIVE-6835
> URL: https://issues.apache.org/jira/browse/HIVE-6835
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.12.0
> Reporter: Anthony Hsu
> Assignee: Anthony Hsu
> Attachments: HIVE-6835.1.patch, HIVE-6835.2.patch, HIVE-6835.3.patch
>
>
> To reproduce:
> {code}
> create table testarray (a array<string>);
> load data local inpath '/home/ahsu/test/array.txt' into table testarray;
> # create partitioned Avro table with one array column
> create table avroarray partitioned by (y string) row format serde
> 'org.apache.hadoop.hive.serde2.avro.AvroSerDe' with serdeproperties
> ('avro.schema.literal'='{"namespace":"test","name":"avroarray","type":
> "record", "fields": [ { "name":"a", "type":{"type":"array","items":"string"}
> } ] }') STORED as INPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.avro.AvroContainerInputFormat' OUTPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.avro.AvroContainerOutputFormat';
> insert into table avroarray partition(y=1) select * from testarray;
> # add an int column with a default value of 0
> alter table avroarray set serde
> 'org.apache.hadoop.hive.serde2.avro.AvroSerDe' with
> serdeproperties('avro.schema.literal'='{"namespace":"test","name":"avroarray","type":
> "record", "fields": [ {"name":"intfield","type":"int","default":0},{
> "name":"a", "type":{"type":"array","items":"string"} } ] }');
> # fails with ClassCastException
> select * from avroarray;
> {code}
> The select * fails with:
> {code}
> Failed with exception java.io.IOException:java.lang.ClassCastException:
> org.apache.hadoop.hive.serde2.objectinspector.StandardListObjectInspector
> cannot be cast to
> org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector
> {code}
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