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Posted to dev@drill.apache.org by "benj (JIRA)" <ji...@apache.org> on 2019/07/08 12:49:00 UTC

[jira] [Created] (DRILL-7319) Option to request NOT NULL column as NULLABLE column

benj created DRILL-7319:
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             Summary: Option to request NOT NULL column as NULLABLE column
                 Key: DRILL-7319
                 URL: https://issues.apache.org/jira/browse/DRILL-7319
             Project: Apache Drill
          Issue Type: Improvement
          Components: Storage - Parquet
    Affects Versions: 1.16.0
            Reporter: benj


When using different Apache Parquet files in the same request, if the Mode(optional/required) is not the same for certain columns, it can produce some errors.

Example:
Error: UNSUPPORTED_OPERATION ERROR: Hash aggregate does not support
schema change
It's very annoying. So why not propose an option that allow to read NOT NULL columns as NULLABLE columns.

I imagine that certain optimizations can't be realized in this case but the queries will work without having to take again the datasets



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