[ARROW-887] [format] For backward compatibility, new unit fields must have default values matching previous implied unit

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.3.0
• Component/s: Format
• External issue URL: https://github.com/apache/arrow/issues/16491
• Assignee: Julien Le Dem
• Reporter: Julien Le Dem
• Created: 24/Apr/17 18:58
• Updated: 11/Jan/23 07:11
• Resolved: 24/Apr/17 20:29

Description

Flatbuffer "defaults the default value" to 0. Which means we interpret previously serialized Flatbuf has having the first element of the enum. In particular Date and Time unit fields end up being read as DateUnit.DAY and TimeUnit.SECOND when the previous implied unit was MILLISECOND for both.

Issue Links

• blocks: ARROW-670 Arrow 0.3 release
• relates to: ARROW-883 [JAVA] Introduction of new types has shifted Enumerations
• links to: PR