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https://issues.apache.org/jira/browse/PARQUET-484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liwei Lin updated PARQUET-484:
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Summary: Warn when Decimal is stored as INT64 while could be stored as
INT32 (was: Add precision, scale compatibility check for DecimalMetadata)
> Warn when Decimal is stored as INT64 while could be stored as INT32
> -------------------------------------------------------------------
>
> 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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