Liwei Lin created PARQUET-484:
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Summary: Add precision, scale compatibility check for
DecimalMetadata
Key: PARQUET-484
URL: https://issues.apache.org/jira/browse/PARQUET-484
Project: Parquet
Issue Type: Improvement
Components: parquet-mr
Affects Versions: 1.8.0, 1.8.1
Reporter: Liwei Lin
Assignee: Liwei Lin
We have some constrains for the Decimal type's precision and scale, as is
documented in
https://github.com/Parquet/parquet-format/blob/master/LogicalTypes.md:
int32: for 1 <= precision <= 9
int64: for 1 <= precision <= 18; precision < 10 will produce a warning
This JIRA proposes to implements the constrains, specifically:
Throws Exception when any of the following does not hold:
- precision > 0 && scale >= 0
- precision >= scale
- for int32, precision <= 9
- for int64, precision <= 18
Throws an Warning when:
- for int64, precision < 10
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