[ARROW-2538] [Java] Introduce BaseWriter.writeNull method

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Java
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/18860
• Assignee: Unassigned
• Reporter: Teddy Choi
• Created: 04/May/18 05:13
• Updated: 11/Jan/23 07:21

Description

When a data set has null values in complex data type, it's hard to call proper writeNull method. Because writeNull is declared in AbstractFieldWriter, which is package local, not public. Moreover, UnionListWriter has no implementation of writeNull method, so it falls into AbstractFieldWriter.writeNull, which throws an IllegalArgumentException by default. So BaseWriter.writeNull is required to write null values inside of complex data types.

Issue Links

• links to: GitHub Pull Request #1994