[ARROW-104] Update Layout.md based on discussion on the mailing list

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.1.0
• Component/s: Format
• External issue URL: https://github.com/apache/arrow/issues/15521
• Assignee: Micah Kornfield
• Reporter: Micah Kornfield
• Created: 14/Apr/16 07:58
• Updated: 11/Jan/23 07:07
• Resolved: 30/Apr/16 02:31

Description

1. Buffers are 64 byte aligned and padded. (we should give some details and/or an example algorithm for why this is important).
2. Types array for unions should only have 1 byte instead of two (mention union of unions as an alternative).