[PARQUET-484] Warn when Decimal is stored as INT64 while could be stored as INT32

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.0, 1.8.1
• Fix Version/s: 1.9.0, 1.8.2
• Component/s: parquet-mr
• Assignee: Liwei Lin(Inactive)
• Reporter: Liwei Lin(Inactive)
• Created: 30/Jan/16 13:57
• Updated: 21/Apr/18 12:38
• Resolved: 19/Apr/16 16:17

Description

Below is documented in https://github.com/Parquet/parquet-format/blob/master/LogicalTypes.md#decimal:

int32: for 1 <= precision <= 9
int64: for 1 <= precision <= 18; precision < 10 will produce a warning

This JIRA proposes to implement the `precision < 10 will produce a warning` part.

Issue Links

• links to: PR #316