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https://issues.apache.org/jira/browse/IMPALA-7281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang updated IMPALA-7281:
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Epic Link: IMPALA-12887
> Mixed-format Parquet+Avro tables incorrectly override column comments
> ---------------------------------------------------------------------
>
> Key: IMPALA-7281
> URL: https://issues.apache.org/jira/browse/IMPALA-7281
> Project: IMPALA
> Issue Type: Bug
> Components: Catalog, Frontend
> Affects Versions: Impala 3.0
> Reporter: Todd Lipcon
> Priority: Major
>
> Following the following steps:
> - create a partitioned table with parquet format
> - add a partition
> - set the new partition to avro format
> - 'show create table' shows no comments on the columns
> - refresh the table
> - 'show create table' now shows "from deserializer" on all of the columns
> This seems to be because, if there is no explicit avro schema, we infer one
> from the defined FieldSchemas. Then, we replace the FieldSchemas with new
> objects inferred from the Avro schema.
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