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From: "Xuefu Zhang (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HIVE-7049) Unable to deserialize AVRO data when
 file schema and record schema are different and nullable
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    [ https://issues.apache.org/jira/browse/HIVE-7049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14000010#comment-14000010 ] 

Xuefu Zhang commented on HIVE-7049:
-----------------------------------

It seems that your patch tries to fix the issue by ignoring the file schema ( passing NULL down). File schema is needed to read decimal data correctly. Thus, we might need to fix in a different way.

> Unable to deserialize AVRO data when file schema and record schema are different and nullable
> ---------------------------------------------------------------------------------------------
>
>                 Key: HIVE-7049
>                 URL: https://issues.apache.org/jira/browse/HIVE-7049
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Mohammad Kamrul Islam
>            Assignee: Mohammad Kamrul Islam
>         Attachments: HIVE-7049.1.patch
>
>
> It mainly happens when 
> 1 )file schema and record schema are not same
> 2 ) Record schema is nullable  but file schema is not.
> The potential code location is at class AvroDeserialize
>  
> {noformat}
>  if(AvroSerdeUtils.isNullableType(recordSchema)) {
>       return deserializeNullableUnion(datum, fileSchema, recordSchema, columnType);
>     }
> {noformat}
> In the above code snippet, recordSchema is verified if it is nullable. But the file schema is not checked.
> I tested with these values:
> {noformat}
> recordSchema= ["null","string"]
> fielSchema= "string"
> {noformat}
> And i got the following exception <line numbers might not be the same due to mu debugged code version>.
> {noformat}
> org.apache.avro.AvroRuntimeException: Not a union: "string" 
>         at org.apache.avro.Schema.getTypes(Schema.java:272)
>         at org.apache.hadoop.hive.serde2.avro.AvroDeserializer.deserializeNullableUnion(AvroDeserializer.java:275)
>         at org.apache.hadoop.hive.serde2.avro.AvroDeserializer.worker(AvroDeserializer.java:205)
>         at org.apache.hadoop.hive.serde2.avro.AvroDeserializer.workerBase(AvroDeserializer.java:188)
>         at org.apache.hadoop.hive.serde2.avro.AvroDeserializer.deserialize(AvroDeserializer.java:174)
>         at org.apache.hadoop.hive.serde2.avro.TestAvroDeserializer.verifyNullableType(TestAvroDeserializer.java:487)
>         at org.apache.hadoop.hive.serde2.avro.TestAvroDeserializer.canDeserializeNullableTypes(TestAvroDeserializer.java:407)
> {noformat}



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