[jira] [Updated] (HUDI-774) Spark to Avro converter incorrectly generates optional fields

["sivabalan narayanan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HUDI-774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

sivabalan narayanan updated HUDI-774:
-------------------------------------
    Labels: pull-request-available user-support-issues  (was: pull-request-available)

> Spark to Avro converter incorrectly generates optional fields
> -------------------------------------------------------------
>
>                 Key: HUDI-774
>                 URL: https://issues.apache.org/jira/browse/HUDI-774
>             Project: Apache Hudi
>          Issue Type: Bug
>            Reporter: Alexander Filipchik
>            Priority: Major
>              Labels: pull-request-available, user-support-issues
>             Fix For: 0.8.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> I think https://issues.apache.org/jira/browse/SPARK-28008 is a good descriptions of what is happening.
>  
> It can cause a situation when schema in the MOR log files is incompatible with the schema produced by RowBasedSchemaProvider, so compactions will stall.
>  
> I have a fix which is a bit hacky -> postprocess schema produced by the converter and
> 1) Make sure unions with null types have those null types at position 0
> 2) They have default values set to null
> I couldn't find a way to do a clean fix as some classes that are problematic are from Hive and called from Spark.



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