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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