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https://issues.apache.org/jira/browse/IMPALA-11710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17731984#comment-17731984
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Gabor Kaszab commented on IMPALA-11710:
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One addition: when creating an Iceberg table without providing tblproperties
then 'external.table.purge' is defaulted to true and we can alter this property
to false later on. This is also persisted in the metadata.json file. However,
once it's false it can't be changed back to true again.
> Table properties are not updated in Iceberg metadata files
> ----------------------------------------------------------
>
> Key: IMPALA-11710
> URL: https://issues.apache.org/jira/browse/IMPALA-11710
> Project: IMPALA
> Issue Type: Bug
> Reporter: Noemi Pap-Takacs
> Priority: Major
> Labels: impala-iceberg
>
> This issue occurs in true external Hive Catalog tables.
> Iceberg stores the default file format in a table property called
> 'write.format.default'. HMS also stores this value loaded from the Iceberg
> metadata json file.
> However, when this table property is altered through Impala, it is only
> changed in HMS, but does not update the Iceberg snapshot. When the table data
> is reloaded from Iceberg metadata, the old value will appear in HMS and the
> change is lost.
> This bug does not affect table properties that are not stored in Iceberg,
> because they will not be reloaded.
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