[jira] [Created] (IMPALA-7281) Mixed-format Parquet+Avro tables incorrectly override column comments

["Todd Lipcon (JIRA)" <ji...@apache.org>]

Todd Lipcon created IMPALA-7281:
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             Summary: 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
            Reporter: Todd Lipcon


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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