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https://issues.apache.org/jira/browse/IMPALA-14877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18073383#comment-18073383
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Raghav Jindal commented on IMPALA-14877:
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Gerrit Review Link : [https://gerrit.cloudera.org/#/c/24188/]
> Create optional nested fields for Iceberg tables
> ------------------------------------------------
>
> Key: IMPALA-14877
> URL: https://issues.apache.org/jira/browse/IMPALA-14877
> Project: IMPALA
> Issue Type: Bug
> Components: Catalog
> Reporter: Zoltán Borók-Nagy
> Assignee: Raghav Jindal
> Priority: Major
> Labels: impala-iceberg, ramp-up
>
> Currently there is no way to specify NULL-ablity for nested fields. For
> Iceberg tables Impala marks nested fields as required which is different from
> Hive/Spark.
> Relevant code:
> https://github.com/apache/impala/blob/cb4fc4e03233a7ff268e8fa8f8891e07c9643213/fe/src/main/java/org/apache/impala/util/IcebergSchemaConverter.java#L257-L266
> Impala should follow the convention that fields are NULL-able (optional) by
> default.
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