Zoltán Borók-Nagy created IMPALA-14877:
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Summary: Create optional nested fields for Iceberg tables
Key: IMPALA-14877
URL: https://issues.apache.org/jira/browse/IMPALA-14877
Project: IMPALA
Issue Type: Bug
Reporter: Zoltán Borók-Nagy
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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